NI PCIe-8255R User Manual
Contents
1. 37 Pin 44 Pin D SUB Terminal Primary Inputor Number on NI 8255R Block Function Output Available Signal Names Pin Number Number Trigger Input 2 TTL Input 0 1 1 General Purpose TTL Input 1 16 2 General Purpose Timed Output 6 TTL Output 1 Pulse 1 4 5 Pulse TTL Output 2 Pulse 2 6 7 TTL Output 3 Pulse 3 T 8 TTL Output 4 Pulse 4 18 20 TRIG 1 Pulse 5 24 TRIG 2 Pulse 6 9 Watchdog Output 1 TTL Output 0 3 4 General Output 3 TTL Output 5 19 21 Purpose TTL Output 6 21 23 TTL Output 7 22 24 TTL Input 0 and TTL Input 1 can also function as trigger change detectors isolated Inputs and Outputs The isolated inputs and outputs on the NI 8255R have a separate ground reference from the main NI 8255R supply providing an easy means to prevent ground loops that can introduce noise into a system You can apply signals up to 30 V to the isolated inputs The voltage swing of the isolated outputs is determined by the voltage you supply on the Viso pins of the device Note Viso can be supplied directly to the 44 pin D SUB when using custom cabling Alternatively Viso can be supplied directly to the 37 pin terminal block and to the NI Vision I O Terminal Block and Prototyping Accessory with the 44 pin to 37 pin NI cable Note The isolated outputs have current limiting protection circuitry If this circuitry is tripped you can re enable the outputs by removing the fault and restarting your co2. 37 Pin 44 Pin D SUB Terminal on NI 8255R Block Signal Primary Alternate Pin Number Number Name Function Function 1 1 TTL Input 0 Pulse generator Trigger Change trigger input Detector General purpose input 2 3 C Common mode signal of the NI 8255R device main power 3 4 TTL Output 0 Watchdog timer General purpose output output 4 5 TTL Output 1 Pulse generator General purpose output output 5 6 C Common mode signal of the NI 8255R device main power NI PCle 8255R User Manual 3 4 ni com signal of the NI 8255R device main power Chapter 3 Signal Connections Table 3 2 Signal Connections Continued 37 Pin 44 Pin D SUB Terminal on NI 8255R Block Signal Primary Alternate Pin Number Number Name Function Function 6 7 TTL Output 2 Pulse generator General purpose output output 7 8 TTL Output 3 Pulse generator General purpose output output 8 6 C Common mode signal of the NI 8255R device main power 9 NC TRIG 2 Pulse generator General purpose TTL Output 8 output output 10 17 Viso Isolated power 11 NC TRIG 0 Pulse generator Trigger Change ISO Input 12 trigger input Detector General purpose input 12 19 ISO Output 0 General purpose output 13 35 ISO Output 1 General purpose output 14 34 Ciso Isolated common mode signal 15 9 ISO Input 0 Input port Data 0 16 2 TTL Input 1 Pulse generator Trigger Change trigger
3. 4 du eee ttr reU n ER eee eee e ye E OLERE aa Ca 1 3 Start Conditlons s uie o de ER TERRE ESTNE ERE ee ERES eR tet 1 4 Acquisition Window Control esere one e S eene nennen nennen nens 1 5 Chapter 2 Hardware Overview Digital W O e322 dae dete HORE RUP URS D i Rete o eek oh 2 1 RIO and the LabVIEW FPGA Module sese 2 1 TTL Inputs and O tp ts e ttr ett tete ARE tr daa eevee 2 2 Isolated Inputs and Outputs 2 tete iter eret sees 2 3 VO for Normal Operation edet ditti e teet ale ei epe ee ino Peto 2 5 Trigger Inputs see erai tetigere o i egere dede 2 5 Tamed Pulse Output 2 2 o n RH RE ete Pe Ue HE te t eaves 2 5 Initiating a Timed Pulse teet 2 6 Pulse Modes 5 rte ite eed dede 2 6 Pulse Delay ai e etre d RR 2 7 Pulse Width inc RR Sethe tn eerie 2 7 Trigger Polarity 3 2 RE REDE UE IRSE E 2 7 Trigger Change Detectors dete eet bata a DOR 2 8 Quadrat re Encodet e e eerte ee s 2 8 Product S lection Port ore e a er eee ener 2 9 Using ISO Input 5 as a Latch esee 2 9 General Purpose VO nne aet e Ae aol DER 2 10 General Purpose Inputs esee 2 10 General Purpose Outputs essere 2 10 W O for Fault Conditions n rrr teet ei been 2 11 Shutdown eet tee tet ala ae se lese 2 11 Watchdo amp Titnet esee eere i eee e ene En dat 2 12 National Instruments Corporation ix NI PCle 8255R User Manual Contents
4. 2 15 Q quadrature encoder 2 8 R reconfigurable I O 2 1 RIO See reconfigurable I O S signal connections 3 1 software NI resources A 1 software programming choices NI Vision Builder for Automated Inspection 1 2 NI Vision Development Module 1 2 start conditions 1 4 T technical support A 1 training and certification NI resources A 1 transmission line effects 2 16 trigger change detectors 2 8 trigger inputs 2 5 troubleshooting NI resources A 1 TTL inputs 2 2 TTL outputs 2 2 ni com Index W Web resources A 1 wiring isolated input to sourcing output device 2 13 isolated output to external load 2 14 National Instruments Corporation F3 NI PCle 8255R User Manual
5. are placed on the device with the signals on the tracks offset by 90 degrees from each other This makes it possible to detect the direction of the motion Reconfigurable inputs and outputs An edge trigger occurs when the trigger signal passes through a specified threshold A slope that is positive to the trigger is specified as the rising edge Any event that causes or starts some form of data capture Transistor transistor logic A digital circuit composed of bipolar transistors wired in a certain manner A typical medium speed digital technology Nominal TTL logic levels are 0 and 5 V Volts direct current The electromotive force NI PCle 8255R User Manual Index A acquisition window control 1 5 ATX connector 3 2 C cabling 3 8 calibration certificate NI resources A 2 connectors 3 2 general purpose digital I O 3 3 IEEE 1394a 3 2 conventions used in the manual vii D Declaration of Conformity NI resources A 1 diagnostic tools NI resources A 1 digital I O connection considerations 2 13 overview 2 1 documentation conventions used in the manual vii NI resources A 1 drivers NI resources A 1 E examples NI resources A 1 F FireWire 1 3 FPGA 2 1 National Instruments Corporation l 1 G general purpose I O 2 10 general purpose inputs 2 10 general purpose outputs 2 10 H help technical support A 1 T O for fault conditions 2 11 T O for normal operation 2
6. camera reset and exposure controlling strobe lighting outputting inspection results or communicating with PLCs You can also define the functions of digital input and output signals For information about how to use LabVIEW to implement specific digital T O functions refer to the examples at lt LabVIEW gt examples IMAQ IMAQ I0 11b where LabVIEW is the location in which LabView is installed For information about how to use C Visual Basic or NET to implement specific digital I O functions refer to the examples at National Instruments NNI IMAQ IO Examples RIO and the LabVIEW FPGA Module Behind the digital I O of the NI 8255R is an FPGA which has been preconfigured with the functionality required for most common machine vision tasks However if the factory configured functionality does not fulfill your requirements the FPGA is user configurable with the LabVIEW FPGA Module RIO allows you to develop custom FPGA logic to add triggering pulse width modulation signals or custom communications protocols to your machine vision application Using National Instruments RIO hardware and the LabVIEW FPGA Module you can define your hardware without in depth knowledge of hardware design tools or hardware description languages HDL When the signal requirements change the LabVIEW code can be modified and downloaded to the FPGA to change the I O mix or type This flexibility allows you to reuse the same hardware and softw
7. path and power to your camera You can use a 6 pin to 9 pin cable or adapter with IEEE 1394a cameras to connect the cameras to the IEEE 1394b ports National Instruments provides an I O terminal block for the NI 8255R which can be mounted either horizontally or vertically The I O terminal block breaks the signals out into easy to use screw terminals and comes with a cable that connects directly to the 44 pin D SUB connector on the NI 8255R TRIG 1 and TRIG 2 signals are not accessible through the standard 44 to 37 pin cable and I O terminal block NI Vision 1 0 Terminal Block and Prototyping Accessory NI PCle 8255R User Manual Use the NI Vision I O Terminal Block and Prototyping Accessory to troubleshoot and prototype digital I O applications for the NI 8254R NI 8255R and the NI CVS 1450 Series compact vision system The NI Vision I O Terminal Block and Prototyping Accessory provides screw terminals for easy connections and LEDs for each signal 3 8 ni com Chapter 3 Signal Connections B Note TRIG 0 TRIG 1 and TRIG 2 signals are not accessible through the standard 44 to 37 pin cable and NI Vision I O Terminal Block and Prototyping Accessory Power Requirements This section describes the power requirements of the NI 8255R isolated Outputs Power Connection The isolated output circuitry requires that a power source be connected to the Viso and Ciso pins on the 44 pin D SUB connector the 37 pin terminal block or t
8. store images as well as perform image analysis and processing Using the Vision Development Module imaging novices and experts can program the most basic or complicated image applications without knowledge of particular algorithm implementations As a part of the Vision Development Module NI Vision Assistant is an interactive prototyping tool for machine vision and scientific imaging developers With Vision Assistant you can prototype vision applications quickly and test how various image processing functions work Vision Assistant generates a Builder file which is a text description containing a recipe of the machine vision and image processing functions 1 2 ni com Chapter 1 Introduction This Builder file provides a guide you can use for developing applications in any ADE such as LabWindows CVI or Visual Basic using the Vision Assistant machine vision and image processing libraries Using the LabVIEW VI creation wizard Vision Assistant can create LabVIEW VI diagrams that perform the prototype you created in Vision Assistant You can then use LabVIEW to add functionality to the generated VI IEEE 1394 and the NI 8255R The NI 8255R uses FireWire IEEE 1394 technology FireWire is a cross platform implementation of the high speed serial data bus defined by the IEEE 1394 1995 TEEE 1394a 2000 and IEEE 1394b 2002 standards that can move large amounts of data between computers and peripheral devices It features simplifie
9. to the development machine through software True indicates an expired watchdog timer False indicates an unexpired watchdog timer The expiration signal that indicates an expired watchdog timer continues to assert until the watchdog timer is disarmed Disarming the watchdog timer resets the software indicator TTL Output 0 This option outputs a signal on TTL Output 0 High indicates that the watchdog timer has expired Low indicates that the watchdog timer has not expired If the watchdog timer has expired the expiration signal continues to assert until the watchdog timer is disarmed Shutdown If Shutdown mode is enabled the outputs go to the user defined shutdown states NI PCle 8255R User Manual 2 12 ni com Chapter 2 Hardware Overview Considerations When Connecting the Digital 1 0 The isolated trigger inputs on the NI 8255R are current sinking and optically isolated The following are considerations you need to make when connecting the digital I O Wiring an Isolated Input to a Sourcing Output Device You can wire an isolated input to a sourcing output device as shown in the following figure Refer to Getting Started with the NI PCle 8255R for information about switching thresholds and current requirements N Caution Do not apply a voltage greater than 30 VDC to the isolated inputs Doing so could damage the NI 8255R Figure 2 5 shows an example of connecting an isolated input to a sourcing output device
10. 5 I O terminal block 3 8 IEEE 1394 camera cables 3 8 connector 3 2 connector function 3 2 instrument drivers NI resources A 1 isolated inputs 2 3 list of 2 4 isolated outputs 2 3 list of 2 4 power connection 3 9 K KnowledgeBase A 1 L LabVIEW FPGA Module 2 1 latch 2 9 NI PCle 8255R User Manual Index National Instruments support and services A 1 NI 1427 software programming choices NI Vision Builder for Automated Inspection 1 2 NI Vision Development Module 1 2 NI 8255R acquisition window control 1 5 ATX connector 3 2 cabling 3 8 connection considerations 2 13 connectors 3 2 digital I O overview 2 1 general purpose I O 2 10 T O for fault conditions 2 11 I O for normal operation 2 5 T O terminal block 3 8 IEEE 1394 camera cables 3 8 isolated inputs 2 3 isolated outputs 2 3 LabVIEW FPGA Module 2 1 NI Vision Terminal Block and Prototyping Accessory 3 8 power requirements 3 9 product selection port 2 9 quadrature encoder 2 8 reconfigurable I O 2 1 signal connections 3 1 start conditions 1 4 trigger change detectors 2 8 trigger inputs 2 5 TTL inputs 2 2 TTL outputs 2 2 NI support and services A 1 NI Vision Assistant 1 2 NI Vision Terminal Block and Prototyping Accessory 3 8 NI PCle 8255R User Manual l 2 P power connection terminals 3 9 power requirements 3 9 product selection port 2 9 programming examples NI resources A 1 protecting inductive loads
11. CC Class A products Depending on where it is operated this Class A product could be subject to restrictions in the FCC rules In Canada the Department of Communications DOC of Industry Canada regulates wireless interference in much the same way Digital electronics emit weak signals during normal operation that can affect radio television or other wireless products All Class A products display a simple warning statement of one paragraph in length regarding interference and undesired operation The FCC rules have restrictions regarding the locations where FCC Class A products can be operated Consult the FCC Web site at www fcc gov for more information FCC DOC Warnings This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the instructions in this manual and the CE marking Declaration of Conformity may cause interference to radio and television reception Classification requirements are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC Changes or modifications not expressly approved by NI could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against ha
12. Considerations When Connecting the Digital I O eese 2 13 Wiring an Isolated Input to a Sourcing Output Device sess 2 13 Wiring an Isolated Output to an External Load sess 2 14 Protecting Inductive Loads essere 2 15 Transmission Line Effects eesessssssseeeeseeeeene nene eene 2 16 Chapter 3 Signal Connections COnDectOIs 4 deuten pun e PORRO ORO RR RU p gn ee 3 2 IEEE 1394b Connectof dite it ed des 3 2 ATX Connectors tapete ae ep EHE 3 2 General Purpose Digital VO 2x5 tetto Dre eps 3 3 Cabling secus ethpet tite dio o EE RUMP senis 3 8 IEEE 1394 Camera Cables et e e eedem er 3 8 VO Terminal Block baee s 3 8 NI Vision I O Terminal Block and Prototyping Accessory 3 8 Power Requirements 5 eite et bte e te tA Ped e pend 3 9 Isolated Outputs Power Connection eeeseeeeeeeeenenenee ene 3 9 Appendix A Technical Support and Professional Services Glossary Index NI PCle 8255R User Manual X ni com Introduction The NI PCIe 8255R NI 8255R is a OHCI compliant IEEE 1394a and IEEE 1394b interface device for PCI Express PCIe with reconfigurable I O RIO The NI 8255R device ships with NI Vision Acquisition Software which contains all of the drivers in the NI Vision product line With NI Vision Acquisition Software you can quickly and easily start your applications without h
13. Corporation 1 1 NI PCle 8255R User Manual Chapter 1 Introduction information about individual software packages refer to the documentation specific to each package Vision Builder for Automated Inspection The NI Vision Builder for Automated Inspection Vision Builder AJ is configurable machine vision software that you can use to prototype benchmark and deploy applications Vision Builder AI does not require programming but is scalable to powerful programming environments Vision Builder AI allows you to easily configure and benchmark a sequence of visual inspection steps as well as deploy the visual inspection system for automated inspection With Vision Builder AI you can perform powerful visual inspection tasks and make decisions based on the results of individual tasks You also can migrate the configured inspection to LabVIEW extending the capabilities of the applications if necessary Vision Development Module NI PCle 8255R User Manual The NI Vision Development Module which consists of NI Vision and NI Vision Assistant is an image acquisition processing and analysis library of more than 270 functions for the following common machine vision tasks e Pattern matching e Particle analysis e Gauging e Taking measurements e Grayscale color and binary image display You can use the Vision Development Module functions individually or in combination With the Vision Development Module you can acquire display and
14. ILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Compliance Compliance with FCC Canada Radio Frequency Interference Regulations Determining FCC Class The Federal Communications Commission FCC has rules to protect wireless communications from interference The FCC places digital electronics into two classes These classes are known as Class A for use in industrial commercial locations only or Class B for use in residential or commercial locations All National Instruments NI products are F
15. NI Discussion Forums at ni com forums National Instruments Application Engineers make sure every question receives an answer For information about other technical support options in your area visit ni com services or contact your local office at ni com contact Training and Certification Visit ni com training for self paced training eLearning virtual classrooms interactive CDs and Certification program information You also can register for instructor led hands on courses at locations around the world System Integration If you have time constraints limited in house technical resources or other project challenges National Instruments Alliance Partner members can help To learn more call your local NI office or visit ni com alliance Declaration of Conformity DoC A DoC is our claim of compliance with the Council of the European Communities using the manufacturer s declaration of conformity This system affords the user protection for electronic compatibility EMC and product safety You can obtain the DoC for your product by visiting ni com certification A 1 NI PCle 8255R User Manual Appendix A Technical Support and Professional Services e Calibration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone nu
16. NI Vision NI PCle 8255R User Manual IEEE 1394a and IEEE 1394b Interface Device with Reconfigurable 1 0 February 2007 c NATIONAL 371911C 01 INSTRUMENTS Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 Worldwide Offices Australia 1800 300 800 Austria 43 662 457990 0 Belgium 32 0 2 757 0020 Brazil 55 11 3262 3599 Canada 800 433 3488 China 86 21 6555 7838 Czech Republic 420 224 235 774 Denmark 45 45 76 26 00 Finland 385 0 9 725 72511 France 33 0 1 48 14 24 24 Germany 49 89 7413130 India 91 80 41190000 Israel 972 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Lebanon 961 0 1 33 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 3390150 Portugal 351 210 311 210 Russia 7 495 783 6851 Singapore 1800 226 5886 Slovenia 386 3 425 42 00 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 2005151 Taiwan 886 02 2377 2222 Thailand 662 278 6777 Turkey 90 212 279 3031 United Kingdom 44 0 1635 523545 For further support information refer to the Technical Support and Professional Services appendix To comment on National Instruments documentation refer to the National Instruments Web site at ni com info and enter the inf
17. Shutdown Shutdown mode is a software enabled feature that when activated allows an external device to halt the NI 8255R processing operations Additionally Shutdown mode allows you to specify user defined shutdown states for all fault conditions When Shutdown mode is enabled and the shutdown input signal ISO Input 11 turns off the NI 8255R registers an external shutdown condition When a fault occurs outputs operate according to user defined shutdown states Each TTL output is configurable to drive high drive low or tri state and each isolated output is on off configurable National Instruments Corporation 2 11 NI PCle 8255R User Manual Chapter 2 Hardware Overview B Note For prototyping when equipment is unavailable you can wire from V to ISO Input 11 to simulate external equipment that indicates to the NI 8255R to operate normally Watchdog Timer The watchdog timer is a software configurable feature that can monitor software on the NI 8255R and take action if the software is unresponsive The millisecond counter on the watchdog timer is configurable up to 65 534 ms in 1 ms increments before it expires Configure the watchdog timer to take one of the following actions when it expires UN Caution Use the Indicator Only option only to test the watchdog timer If software becomes unresponsive it cannot be relied upon to send notification to the host Indicator Only This option sends the expiration signal back
18. Sourcing Output wee nee eee tees ee cep ee ese ee cee ALIAE RAS Device x Vcc Input Current e NUS i f Limiter T AEE R A eee A A AA NI 8255R Figure 2 5 Connecting isolated input to a sourcing output device National Instruments Corporation 2 13 NI PCle 8255R User Manual Chapter 2 Hardware Overview Wiring an Isolated Output to an External Load The digital output circuit sources current to external loads as shown in Figure 2 6 UN Caution Do not draw more than 100 mA from 24 V or 30 V isolated outputs Do not draw more than 50 mA from 5 V isolated outputs e Viso Vcc i Er 4 IAAL L gt VN c7 Digital Output SIR LUE e TS Load b Ciso NI8255R 777 Figure 2 6 Digital output circuit sourcing current to external loads NI PCle 8255R User Manual 2 14 ni com Chapter 2 Hardware Overview Protecting Inductive Loads When an inductive load such as a relay or solenoid is connected to an output a large counter electromotive force may occur at switching time due to energy stored in the inductive load This flyback voltage can damage the outputs and the power supply To limit flyback voltages at the inductive load install a flyback diode across the load Mount the flyback diode as close to the load as possible Use this protection method if you connect any of the is
19. are at no extra expense National Instruments Corporation 2 1 NI PCle 8255R User Manual Chapter 2 Hardware Overview NI IMAQ I O devices such as the the NI 8255R have 29 digital I O lines with built in functionality for communicating with external devices such as reading quadrature encoder inputs generating strobe pulses and writing to or reading from digital lines NI IMAQ I O devices have 15 digital input lines 13 optically isolated lines and two dedicated TTL lines There are 14 digital output lines four optically isolated lines and 10 dedicated TTL lines Using these signals you can dynamically control your lighting or cameras synchronize with a conveyor belt or communicate with relays that control solenoids and other actuators For more information about using the LabVIEW FPGA Module to implement custom FPGA logic refer to the examples at lt LabVIEW gt examples IMAQ IMAQ IO FPGA 11b TTL Inputs and Outputs TTL is a fast switching 5 V digital signaling standard commonly used for applications that require high precision such as camera triggering TTL inputs and outputs do not require a separate power supply UN Caution Do not connect voltage or current sources to TTL outputs Doing so could damage the NI 8255R NI PCle 8255R User Manual 2 2 ni com Chapter 2 Hardware Overview Table 2 1 summarizes the TTL inputs and outputs available on the NI 8255R Table 2 1 NI 8255R TTL Inputs and Outputs
20. aving to program the device at the register level The NI 8255R includes TTL inputs and outputs for triggering and isolated inputs and outputs for connecting to external devices such as lighting controllers proximity sensors and quadrature encoders Behind the digital I O of the NI 8255R is an FPGA which has been preconfigured with the functionality required for most common machine vision tasks However if the factory configured functionality does not fulfill your requirements the FPGA is user configurable using the LabVIEW FPGA Module The NI 8255R provides a convenient 44 pin D SUB connector on its front panel to access the digital I O For detailed specifications of the NI 8255R refer to the Specifications section of Getting Started with the NI PCle 8255R Software Overview Programming the NI 8255R requires two drivers to control the hardware NI IMAQdx and NI IMAQ I O Both drivers are included with the NI Vision Acquisition Software NI IMAQdx controls the IEEE 1394 cameras connected to the NI 8255R NI IMAQdx has an extensive library of functions you can call and handles the communication between the computer and the image acquisition device such as programming interrupts and camera control NI IMAQ I O provides functions to control the I O on the NI 8255R National Instruments also offers the following application software packages for analyzing and processing your acquired images For detailed National Instruments
21. cal accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow th
22. can use a 6 pin to 9 pin cable or adapter with IEEE 1394a cameras to connect the cameras to the IEEE 1394b ports ATX Connector The ATX connector on the NI 8255R allows the 1394 devices that are connected to the NI 8255R to draw power directly from the computer power supply instead of the PCI Express bus The PCI Express bus has a stricter current draw allowance than the computer power supply Connect the NI 8255R device to the computer power supply by connecting an unused ATX power connector from within the computer chassis to the ATX connector on the NI 8255R The green LED on the front panel of the NI 8255R device will illuminate when the ATX connector is connected to the computer power supply and the computer is on NI PCle 8255R User Manual 3 2 ni com Chapter 3 Signal Connections B Note If possible camera power should be provided through the ATX connector inside the computer If you cannot supply camera power through the ATX connector camera power is supplied by the PCI Express bus and should be limited to 3 W shared by both ports General Purpose Digital 1 0 The 44 pin D SUB connector provides access to the general purpose digital inputs and outputs and the isolated power supply The general purpose digital I O available on this connector includes 2 TTL inputs 10 TTL outputs 13 isolated inputs and 4 isolated outputs In addition to I O the 44 pin D SUB connector provides access to Viso and Ciso for powering the isolated outpu
23. d cabling using twisted pairs hot swapping and transfer speeds of up to 800 megabits per second You can support up to 63 devices on the high speed bus with IEEE 1394 The NI 8255R provides two direct connect IEEE 1394b bilingual ports which support IEEE 1394a and IEEE 1394b devices More IEEE 1394 devices can be added using IEEE 1394 hubs The NI 8255R can acquire images from IEEE 1394 cameras conforming to the IIDC 1394 based Digital Camera Specification Version 1 30 and later The IEEE 1394 bus provides a fixed amount of bandwidth that is shared between the two IEEE 1394 ports on the NI 8255R These ports provide direct connection for up to two DCAM compliant IEEE 1394 cameras depending on the amount of bandwidth each camera requires Higher frame rates and larger image sizes require a higher data transfer rate and use more bandwidth Functional Overview The NI 8255R features a high speed data path optimized for receiving and formatting video data from IEEE 1394 cameras Using an IEEE 1394a device with the NI 8255R requires a 1394a to 1394b cable or adapter National Instruments Corporation 1 3 NI PCle 8255R User Manual Chapter 1 Introduction Figure 1 1 illustrates the key functional components of the NI 8255R ISO In TTL In PCle PCle to RIO DSUB Conn PCI Bridge TTL Out UL it il ELT ISO Out ISO Power Connection 1394b 1394 Controller Conns 1394 Power Con
24. d dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes variables emphasis a cross reference or an introduction to a key concept Italic text also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions NI 8255R refers to the NI PCIe 8255R interface device Contents Chapter 1 Introduction Software Overview de ead nn ee dee dte eee ec eU bet coitus 1 1 Vision Builder for Automated Inspection eeeeeeeeeeeeee 1 2 Vision Development Module eese enne 1 2 IEEE 1394 and the N 8255R a nS chin teint Selen ed bre epa ake eed 1 3 Functional OVetVvie Ww
25. e 2 8 Signal Connections Figure 3 1 shows the connectors and LEDs on the NI 8255R CN 2 39 i i S A 2 1 IEEE 1394b Bilingual Connector 4 Digital I O Connector 2 ISO ATX Power Status LEDs 5 Camera Power ATX Connector 3 IEEE 1394b Bilingual Connector Figure 3 1 NI 8255R Connectors National Instruments Corporation 3 1 NI PCle 8255R User Manual Chapter 3 Signal Connections Table 3 1 summarizes the functions of the connectors on the NI 8255R Table 3 1 NI 8255R Connector Functions Peripheral Connector Function TEEE 1394 9 pin IEEE 1394b bilingual Power and data connection to connector TEEE 1394 devices Camera Power 4 pin ATX computer power Power from PC power supply to connector TEEE 1394b connectors Digital Input Output 44 pin female high density External TTL I O D SUB connector External isolated I O Power for isolated outputs Connectors This section describes the connectors on the NI 8255R and includes pinouts and signal descriptions IEEE 1394b Connector The NI 8255R provides two direct connect IEEE 1394b bilingual connectors which support IEEE 1394a and IEEE 1394b devices The connectors provide a reliable high frequency connection between the NI 8255R device and up to two DCAM compliant IEEE 1394 cameras To access the IEEE 1394b connectors on the NI 8255R device use any standard 9 pin IEEE 1394 cable ER Note You
26. e National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation National Instruments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to reproduce software or other materials belonging to others you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction Trademarks National Instruments NI ni com and LabVIEW are trademarks of National Instruments Corporation Refer to the Terms of Use section on ni com 1egal for more information about National Instruments trademarks FireWire is the registered trademark of Apple Computer Inc Other product and company names mentioned herein are trademarks or trade names of their respective companies Members of the National Instruments Alliance Partner Prog
27. e and de asserts after the configured pulse width You can set the delay time in microseconds or in quadrature encoder counts from the start signal either a hardware trigger or a software command Width is always configured in microseconds National Instruments Corporation 2 5 NI PCle 8255R User Manual Chapter 2 NI PCle 8255R User Manual Hardware Overview Initiating a Timed Pulse Each timed pulse generator has a trigger input that specifies whether to wait on a particular trigger input to generate the pulse or to immediately generate the pulse when software sets the pulse mode to Start in LabVIEW or imaqIOPulseStart in C Visual Basic and NET If the trigger input is set to Immediate in LabVIEW or using a None status signal in C and Visual Basic the pulse generation occurs as soon as the pulse mode is set to Start in LabVIEW or imagIOPulseStart in C and Visual Basic After generating a pulse it immediately generates another pulse until the pulse generation is stopped If the trigger input is set to one of the hardware trigger inputs the timed pulse output waits for an assertion edge on the appropriate trigger input After generating a pulse it waits for another trigger before generating another pulse The assertion edge is configurable based on the trigger polarity parameter It then generates one pulse and rearms to wait for the next trigger In either case the pulse output generation stops and resets if the pulse mode paramete
28. he NI Vision I O Terminal Block and Prototyping Accessory The isolated outputs power connection on the NI 8255R accommodates one power supply The Viso terminal provides the isolated power 5 to 30 VDC for the NI 8255R The Ciso terminal provides the common mode signal for the NI 8255R as shown in Table 3 3 Table 3 3 Power Connection Terminals Terminal Description Viso Isolated power 5 to 30 VDC Ciso Isolated common mode signal iyi Note The orange ISO LED on the front panel of the NI 8255R device will illuminate when Viso and Ciso are properly connected to an external power supply National Instruments Corporation 3 9 NI PCle 8255R User Manual Technical Support and Professional Services Visit the following sections of the National Instruments Web site at ni com for technical support and professional services National Instruments Corporation Support Online technical support resources at ni com support include the following Self Help Resources For answers and solutions visit the award winning National Instruments Web site for software drivers and updates a searchable KnowledgeBase product manuals step by step troubleshooting wizards thousands of example programs tutorials application notes instrument drivers and so on Free Technical Support All registered users receive free Basic Service which includes access to hundreds of Application Engineers worldwide in the
29. he pulse generation delay NI PCle 8255R User Manual 2 8 ni com Chapter 2 Hardware Overview Figure 2 4 shows a rising edge trigger and a low pulse with a quadrature encoder delay and a microsecond width Trigger _ Low Pulse Delay Width sea UU UUUUUUUY es UUUHUUUUU UU Figure 2 4 Rising edge trigger and a low pulse with a quadrature encoder delay and a microsecond width Product Selection Port The product selection port consists of a group of five isolated digital inputs that the software running on the NI 8255R reads simultaneously You can program the NI 8255R to switch between up to 32 inspection sequences for different parts on an assembly line Based on the input to the product selection port you can configure the application software to run the appropriate inspection sequence For example an upstream NI 8255R programmed for part classification might drive the product selection port of a downstream NI 8255R Alternatively a PLC with information about which part is being inspected can drive the product selection port of the NI 8255R Using ISO Input 5 as a Latch You can configure the product selection port to use ISO Input 5 as a latch A rising edge on ISO Input 5 can latch the data into a data register
30. input Detector General purpose input 17 3 C Common mode National Instruments Corporation 3 5 NI PCle 8255R User Manual Chapter 3 Signal Connections Table 3 2 Signal Connections Continued 37 Pin 44 Pin D SUB Terminal on NI 8255R Block Signal Primary Alternate Pin Number Number Name Function Function 18 20 TTL Output 4 Pulse generator General purpose output output 19 21 TTL Output 5 General purpose output 20 22 C Common mode signal of the NI 8255R device main power 21 23 TTL Output 6 General purpose output 22 24 TTL Output 7 General purpose output 23 22 C Common mode signal of the NI 8255R device main power 24 NC TRIG 1 Pulse generator General purpose TTL Output 9 output output 25 33 Viso Isolated power 26 34 Ciso Isolated common mode signal 27 36 ISO Output 2 General purpose output 28 37 ISO Output 3 General purpose output 29 12 Cio Isolated common mode signal 30 10 ISO Input 1 Input port Data 1 NI PCle 8255R User Manual 3 6 ni com Chapter 3 Signal Connections Table 3 2 Signal Connections Continued 37 Pin 44 Pin D SUB Terminal on NI 8255R Block Signal Primary Alternate Pin Number Number Name Function Function 31 11 ISO Input 2 Input port Data 2 32 13 ISO Input 3 Input port Data 3 33 16 Cio Isola
31. mbers for our worldwide offices are listed at the front of this manual You also can visit the Worldwide Offices section of ni com niglobal to access the branch office Web sites which provide up to date contact information support phone numbers email addresses and current events NI PCle 8255R User Manual A 2 ni com Glossary ADE bandwidth C current D D SUB DCAM E exposure F falling edge FireWire National Instruments Corporation G 1 Application development environment such as LabVIEW Visual Basic or Microsoft Visual C The range of frequencies present in a signal or the range of frequencies to which a measuring device can respond The rate of flow of electric charge measured in amperes A serial connector Digital camera The amount of time that light reaches the image sensor An edge trigger occurs when the trigger signal passes through a specified threshold A slope that is negative to the trigger is specified as the falling edge A high speed serial interface invented by Apple Computer in 1989 also known as IEEE 1394 or iLink NI PCle 8255R User Manual Glossary FPGA HDL hot swapping TEEE IIDC isolated NI IMAQdx pixel PLC NI PCle 8255R User Manual Field programmable gate array An FPGA is a semi conductor device which contains a large quantity of gates logic devices which are not interconnected and whose function is determined by a wiring li
32. mputer National Instruments Corporation 2 3 NI PCle 8255R User Manual Chapter 2 Hardware Overview Table 2 2 summarizes the isolated inputs and outputs available on the NI 8255R Table 2 2 NI 8255R Isolated Inputs and Outputs 37 Pin 44 Pin D SUB Terminal Primary Input or Number on NI 8255R Block Function Output Available Signal Names Pin Number Number Trigger Input 3 TRIG 0 11 ISO Input 57 35 15 ISO Input 8 40 27 Quadrature Input 1 ISO Input 6 37 25 Encoder ISO Input 7 38 26 External Input 1 ISO Input 11 44 31 Shutdown Control Product Input 1 ISO Input 0 15 9 Selection ISO Input 1 30 10 Port ISO Input 2 31 11 ISO Input 3 32 13 ISO Input 4 34 14 General Input 2 ISO Input 9 41 29 Purpose ISO Input 10 43 30 General Output 4 ISO Output 0 12 19 Purpose ISO Output 1 13 35 ISO Output 2 27 36 ISO Output 3 28 37 TRIG 0 ISO Input 8 ISO Input 9 and ISO Input 10 can also function as trigger change detectors ISO Input 5 can also function as a latch for the product selection port NI PCle 8255R User Manual 2 4 ni com Chapter 2 Hardware Overview 1 0 for Normal Operation Trigger Inputs The following sections describe I O functions that are available on the NI 8255R during normal operation Trigger inputs are available from both TTL inputs and isolated inputs You can use these trigger inputs to synchronize the NI 8255R with an external event such as the as
33. n fi Figure 1 1 NI 8255R Block Diagram Start Conditions The NI 8255R can start acquisitions in the following ways Software control You can configure the NI 8255R to capture a fixed number of frames Use this configuration for capturing a single frame or a sequence of frames Trigger control You can start an acquisition by enabling external trigger lines Each of these inputs can start a video acquisition on a rising or falling edge NI PCle 8255R User Manual 1 4 ni com Chapter 1 Introduction Acquisition Window Control You can configure the following parameter on the NI 8255R to control the video acquisition window Acquisition window The NI 8255R and the IIDC 1394 based Digital Camera Specification allow you to specify a particular region of active pixels and lines on a camera to acquire In many cases specifying a smaller acquisition window will increase the maximum frame rate of the camera Valid acquisition windows and their corresponding frame rates are defined by the camera National Instruments Corporation 1 5 NI PCle 8255R User Manual Hardware Overview Digital 1 0 The digital I O on the NI 8255R is accessible through 2 TTL inputs 10 TTL outputs 13 isolated inputs and 4 isolated outputs You can use input signals as triggers product selection ports or to read quadrature encoders Uses for output signals include controlling
34. o code feedback 2006 2007 National Instruments Corporation All rights reserved Important Information Warranty The NI PCIe 8255R is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this document is accurate The document has been carefully reviewed for techni
35. olated outputs on the NI 8255R to an inductive load Figure 2 7 shows an example of using an external flyback diode to protect inductive loads Vcc i Yay A 1 jr i WZ Digital Output RA M mue D a Ciso ET E E E A eed External NI 8255R Flyback Diode for Inductive Loads Figure 2 7 An external flyback diode protecting inductive loads National Instruments Corporation 2 15 NI PCle 8255R User Manual Transmission Line Effects Transmission line effects can degrade the signals on the I O cables and cause instability To minimize transmission line effects use twisted pair wires with a characteristic impedance of 118 Q to connect external signals to the 44 pin I O D SUB connector Figure 2 8 shows connections to the 44 pin D SUB connector that minimize transmission line effects i VVV lel Receiving 2e OCOC Equipment TTLIN 0 1 Rs ize oec ow l l_ Transmitting py Equipment NI 8255R Figure 2 8 Connections to the 44 pin D SUB connector that minimize transmission line effects When connecting to TTL inputs on the NI 8255R match the output impedance of the transmitting device to the characteristic impedance of the cable For example if the cable characteristic impedance is 118 Q make R equal to 118 Q as shown in the Figur
36. on the NI 8255R Before each inspection the software checks the status of the product select inputs and reads the most recent value latched into the register If ISO Input 5 is not used as a latch it can be used as an extra bit of data 3 Note In Vision Builder AI ISO Input 5 is always designated as a latch National Instruments Corporation 2 9 NI PCle 8255R User Manual Chapter 2 Hardware Overview Table 2 3 lists the product selection ports Table 2 3 NI 8255R Product Selection Ports Function External Connection Data 5 rising edge latch ISO Input 5 Data 4 ISO Input 4 Data 3 ISO Input 3 Data 2 ISO Input 2 Data 1 ISO Input 1 Data 0 ISO Input 0 General Purpose 0 NI PCle 8255R User Manual General purpose inputs and outputs are available as both TTL and isolated connections The software running on the NI 8255R can read the inputs and drive the outputs high or low at any time General Purpose Inputs The primary difference between general purpose inputs and trigger inputs is that you cannot use general purpose inputs to initiate a timed pulse generator In an application use the general purpose inputs to get the status of the inputs at a given point and not to synchronize the NI 8255R with an external event An example of how to use general purpose inputs is reading the status of a general purpose input as the first step in your inspection sequence and recording that value as
37. part of your inspection General Purpose Outputs The primary difference between general purpose outputs and timed pulse outputs is that the timing of general purpose outputs is controlled by software rather than hardware As a result timing of general purpose outputs changes as the inspection algorithm changes which makes general purpose outputs less appropriate than timed outputs for camera control strobe light control and other applications that require precise timing 2 10 ni com Chapter 2 Hardware Overview An example of using general purpose outputs is driving a relay that turns on an Inspection in Progress light for an operator to see while the inspection sequence is running 1 0 for Fault Conditions The NI 8255R recognizes the following fault conditions External shutdown when Shutdown mode is enabled e Watchdog timer expiration In the event of a fault condition the behavior of the NI 8255R is dependent on configuration settings of the software enabled Shutdown mode To resume operation address the fault condition and cycle power on your computer Table 2 4 summarizes how user configuration affects the behavior of the NI 8255R in the event of a fault condition Table 2 4 Fault Condition Behavior Outputs Change to Fault Condition Shutdown Enabled User Defined States External Shutdown On Yes Off No Watchdog On Yes Off No The following sections describe each fault condition
38. r is set to Stop in LabVIEW or imagIOPulseStop in C and Visual Basic Figure 2 1 shows an output pulse when a trigger is selected Trigger Input Output Pulse L Figure 2 1 Output pulse when trigger is selected Pulse Modes Each pulse generator has a Start and a Stop mode Configure the pulse generator when in Stop mode and then set it to Start mode 2 6 ni com Chapter 2 Hardware Overview Pulse Delay Pulse delay is the amount of time between a trigger and the first assertion edge of an output pulse The pulse delay is configurable in units of microseconds or quadrature encoder counts If configured for microseconds available values are between 1 us and 4 294 967 295 us which is 4 294 seconds or approximately 71 minutes If the delay is configured for quadrature encoder counts the range of choices is 0 counts to 4 294 967 295 counts Pulse Width Pulse width is the amount of time between the first assertion edge of a pulse and the second deassertion edge Pulse width is configurable only in microseconds from 1 us to 4 294 967 295 us Trigger Polarity Each pulse generator can be individually configured for rising or falling edge triggering Even if multiple pulse generators are using the same trigger each can have different polarities Figure 2 2 shows the output of a pulse generator configured to look for a rising edge trigger and outpu
39. ram are business entities independent from National Instruments and have no agency partnership or joint venture relationship with National Instruments Patents For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FA
40. rmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user is required to correct the interference at their own expense Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Compliance with EU Directives Users in the European Union EU should refer to the Declaration of Conformity DoC for information pertaining to the CE marking Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product visit ni com certification search by model number or product line and click the appropriate link in the Certification column The CE marking Declaration of Conformity contains important supplementary information and instructions for the user or installer Conventions bold italic monospace NI 8255R The following conventions are used in this manual The symbol leads you through nested menu items an
41. sertion of a signal generated by a proximity sensor or a PLC to indicate that an inspection item is passing in front of the camera The NI 8255R can use this input to initiate a timed pulse for camera control lighting control encoder pulse counting and result output timing For more information about creating a timed pulse output refer to the Timed Pulse Output section TTL Input 0 TTL Input 1 TRIG 0 ISO Input 6 ISO Input 7 ISO Input 8 and ISO Input 11 can alternatively function as general purpose inputs ISO Input 5 can alternatively function as a latch for the product selection port Timed Pulse Output The NI 8255R is capable of timed pulse output on six different digital outputs which provides precise control over time critical signals such as camera exposure This section describes the various uses for the timed pulse output and the parameters you can set to control these outputs Uses for timed pulse output include controlling camera reset and exposure controlling strobe lighting operating plungers on an assembly line and communicating with PLCs You can configure the start of the pulse output generation to occur from software or from a rising or falling edge of a trigger input In addition to controlling the timing of pulse output you can also configure the polarity of the output signal resulting in a high true or low true signal Based on the polarity setting the output signal asserts after the appropriate delay tim
42. st which is downloaded to the FPGA The wiring list determines how the gates are interconnected and this interconnection is performed dynamically by turning semiconductor switches on or off to enable the different connections Hardware description language An example of an HDL is VHDL a language used to design digital circuitry The act of removing or swapping a device when power is applied to it Institute of Electrical and Electronics Engineers IEEE 1394 Trade Association Instrumentation and Industrial Control Working Group Digital Camera Sub Working Group A signal which has no electrical connection to the overall system power Driver software for National Instruments IEEE 1394 and Gigabit Ethernet interface devices The fundamental picture element in a digital image The smallest resolvable rectangular area of an image either on a screen or stored in memory Each pixel has its own brightness and color usually represented as red green and blue intensities Programmable Logic Controller An industrial computer used for factory automation process control and manufacturing systems G 2 ni com proximity sensor Q quadrature encoder R RIO rising edge T trigger TTL V VDC voltage National Instruments Corporation G 3 Glossary Optical sensor which toggles an electrical signal when an object passes near it An encoding technique for a rotating device where two tracks of information
43. t a high pulse with a microsecond delay and width Delay Width Trigger Pulse 4 Figure 2 2 Pulse generator output when configured to detect rising edge trigger National Instruments Corporation 2 7 NI PCle 8255R User Manual Chapter 2 Hardware Overview Figure 2 3 shows how to create a high and low pulse train with a microsecond delay and width High Pulse Train Delay Width Delay Width Low Pulse Train Software Start Figure 2 3 Creating a high and low pulse train with a microsecond delay and width Trigger Change Detectors The NI 8255R is capable of detecting edges on various trigger lines and latching this information for future retrieval This feature is useful for high precision hardware monitoring of the presence of external events without the need for software polling You can arm for the detection of a rising edge falling edge or both on a supported trigger input line Supported trigger input lines include TTL Input 0 TTL Input 1 ISO Input 8 ISO Input 9 ISO Input 10 and TRIG 0 Quadrature Encoder The quadrature encoder uses ISO Input 6 for its Phase A input and ISO Input 7 for its Phase B input Encoder speed is limited by the speed of the isolated inputs Each isolated input can change at a maximum rate of 100 kHz making the maximum encoder rate 400 000 counts s The quadrature encoder can also be used as a timebase for t
44. ted common mode signal 34 14 ISO Input 4 Input port Data 4 35 15 ISO Input 5 Input port latch Pulse generator Data 5 trigger input 36 28 Ciso Isolated common mode signal 37 25 ISO Input 6 Quadratureencoder General purpose Phase A input 38 26 ISO Input 7 Quadratureencoder General purpose Phase B input 39 28 Co Isolated common mode signal 40 27 ISO Input 8 Pulse generator Trigger Change trigger input Detector General purpose input 41 29 ISO Input 9 General purpose Trigger Change input Detector General purpose input 42 32 Cio Isolated common mode signal National Instruments Corporation 3 7 NI PCle 8255R User Manual Chapter 3 Signal Connections Table 3 2 Signal Connections Continued 37 Pin 44 Pin D SUB Terminal on NI 8255R Block Signal Primary Alternate Pin Number Number Name Function Function 43 30 ISO Input 10 General purpose Trigger Change input Detector General purpose input 44 31 ISO Input 11 User shutdown General purpose input TRIG 0 TRIG 1 and TRIG 2 are not available on the 37 pin terminal block or the NI Vision I O Terminal Block and Prototyping Accessory If you need access to these signals you can get them directly from the 44 pin D SUB connector Cabling IEEE 1394 Camera Cables 1 0 Terminal Block 3 Note TRIG 0 You can connect cameras to the NI 8255R using standard 9 pin IEEE 1394 cables IEEE 1394 cables provide both a data
45. ts with an external power supply The orange LED on the front panel of the NI 8255R illuminates when power for the isolated outputs is present For easy connection to the digital I O connector use the National Instruments digital I O cable and the NI Vision I O Terminal Block and Prototyping Accessory 3 Note The accessories available for use with the NI 8255R do not provide access to all available I O on the NI 8255R device To access this I O you can create a custom cable using a standard male 44 pin D SUB connector For more information about the National Instruments digital I O cable and terminal blocks refer to the Optional Equipment section of Getting Started with the NI PCIe 8255R yi Note Isolated inputs are compatible with 5 V logic if the external circuit meets the voltage and current requirements listed in the Specifications section of Getting Started with the NI PClIe 8255R Caution Do not draw more than 100 mA from 24 V or 30 V isolated outputs Do not draw more than 50 mA from 5 V isolated outputs National Instruments Corporation 3 3 NI PCle 8255R User Manual Chapter 3 Signal Connections Figure 3 2 illustrates the 44 pin D SUB connector on the NI 8255R 44 30 15 Figure 3 2 NI 8255R 44 Pin D SUB Connector Table 3 2 lists pin numbers signal names and signal descriptions for the 44 pin D SUB connector on the NI 8255R and the 37 pin terminal block Table 3 2 Signal Connections
Download Pdf Manuals
Related Search