SCC-68 User Guide - National Instruments
Contents
1. National Instruments Corporation 21 SCC 68 User Guide NOU PUL UODGUIOUO JOJOBUUOD Uld OZ AINPOW JIS Gh aunbiy ON ON ON Ap Io AG ON a ON ONG IV LL IV ON Y SINPOW OOS Meals ON 6L 02 ON Zh 8h ON EL lat ASI L vb GND IVT LE Zk Deel AS 6 OL 0d 2 8 ON S 9 ASNaS lv elr elv z A 0d C ONS a C ON IV OC LL IW C S ely NPON OOS LIA on feroz ON ON Zi 8h ON ON SL 91 ON ASL Jet ASI GND IY f t 2b Io AS paa AS 6 OL aNd a Z0d 2 8 ON ON S 9 GND ASNas lv v OLIV ziv L z ON ei LA Zz 0d 6r and al6 G GND Iv lez Ol iv tE O zivis G ON ON ON ASh Io AG an9 a ON GND IV 6 IV ON aINPpoW OOS ON ON ON AGL GND IY pasay AS UO ON SSNS IV LIV LOd ZF and a Z AND Iv Zz 6 Iv 99 Livlee ODOOO L SINPO OOS CIT ON 61 02 ON ON ZL 81 ON ON SL 9b ON ASL JE ASH GND iv bE zt Jeu AS AEE 6 o ansa 00d 218 ON ON s 9 GNDIV ASNaS IY 7 ENK CARE ON XFL 00d es O any alr 9 GN IV rz O ELS o 1v 89 ni com 22 SCC 68 Use2. z D Bus B 77 ei z Q 73 O Bus A and Bus B are not connected to any other signals on the SCC 68 Soos 83 Figure 10 Bus Terminals National Instruments Corporation 15 SCC 68 User Guide The bus terminals do not provide external power to the SCC modules installed in the SCC 68 or to the 5V terminal Refer to the Power Supply Considerations section for information about providing power to SCC modules in your application Power Supply In most situations the SCC 68 is powered by the DAQ device eliminating the need for an external power supply The 5V power provided by the DAQ device is distributed to all components in the SCC 68 including the 5V screw terminal pin 8 The 5V power on the DAQ device is current limited For more information about the power supply and possible limitations refer to the Power Supply Considerations section Using SCC Modules with the SCC 68 The SCC 68 has four SCC slots for integrating signal conditioning into your applications Each SCC slot can be used with any analog input or digital I O SCC modules The SCC 68 is not compatible with analog output or counter SCC modules ei Note If you use analog input SCC modules with the SCC 68 you must connect AI SENSE to AI GND as shown in Figure 11 C Al SENSE Al GND 20 22 54 21 55 DEDSSVS Figure 11 Connecting Al SENSE to Al
3. 9 Zd vt ldd lZd 6 ldd ONG a GND Iv TO Z diL ldd ON a Soe 0 10 DBUUOD S N S N SLNAINNULSN Jeqe SOUaIBJ9Y 89 OOS TWNOILLVN isl t PON DOS EPON DOS DO DOS PON DOS eoa 2b zoa 6r tod z God zo ano a jz ano a 6 anga z an9a le ana Iv ze ANd Iy lez ANd I zz AND Iv rz LL lv len orviie ewl 81y lee E Iv oe Z lv s9 Liv Jee 0 lv 89 SCC 68 User Guide 39 National Instruments Corporation au OVA 10198UU04 Uld 89 Salas W JOL app soUdalay JANY ZZ aunbil4 gt lt ww Au ZZ ebney due v sng ES SEOIABP WOS UO ON ONE OV SS OV Le SSS Se OU DIHS SZ E ae H GA da IHS QTAIHS P fie ome lddY 02 m s lansa GND IY 29 t 8 RE z ASNAS IV 29 SL Od 87 Se GN Iv OL ASNAS IV V 103NNO9 sandon oo Thy Sv 9 0d SONY 99S HOS E pre rea kod Ok Ern Geil 19 H or 220d 810d Er oz IV 8 ge an9a Ea 610d cv AND IV 79 L123 lazoa 02 0d ly ez Iv 9z H ce Jano a L 0d 9 EE H or 620d P ec 0d S be an9 Iv leg pp 1 Fer anoa eg E 8 EH O IV 89 L OECD be 0d Z6 Kb ge IV SZ stlanna eg Sed E GN9 Iv 99 PN ee Seog a ANS Iv FZ Le Iv ez A EL fano a Fa TO OL Ez IW ZS Solo JOJOBUUOD SELES IN SLNAIAN
4. 68 align the two back tabs into the corresponding holes at the back of the base as shown in the detail in Figure 2 With the cover and base of the enclosure aligned snap the SCC 68 closed To secure the SCC 68 enclosure use a flathead screwdriver to push the screw down against the spring resistance and tighten the screw UN Caution The captive screw must be used to secure the enclosure when connecting hazardous voltage gt 30 Vims 42 4 Nal VDC signals to an SCC RLYO1 module Note For safest operation of the SCC 68 NI recommends always using the captive screw to keep the SCC 68 in a closed position 1 Strain Relief Posts 4 Hinge Tabs 2 Snapping Latches 5 Strain Relief Holes for Cable Ties 3 Captive Screw Figure 2 SCC 68 Enclosure Features National Instruments Corporation 5 SCC 68 User Guide Stacking and Wall Mounting The SCC 68 has grooves on the bottom of the enclosure that allow the device to be stacked on top of other SCC 68 connector blocks ei Note The SCC 68 cannot be securely stacked onto another SCC 68 if the rear rubber feet are attached The SCC 68 also has mounting holes on the bottom of the device for secure wall mounting The third mounting hole allows you to mount the SCC 68 onto a wall sideways or inverted Refer to Figures 3 and 4 for more information about the location and use of these enclosure features i 17 78 cm 7 00in S44 70em ey 2 50 in df e 2
5. LabWindows CVI version 7 0 or later Visual C Visual Basic To install NI DAQmx refer to the DAQ Getting Started Guide National Instruments Corporation 27 SCC 68 User Guide Configuring the SCC 68 SCC 68 User Guide The SCC 68 can be configured as an SCC carrier and as a screw terminal accessory To configure the SCC 68 as both an SCC carrier and a screw terminal accessory you need to follow the configuration instructions in the Configuring the SCC 68 as an SCC Carrier section and the Configuring the SCC 68 as a Screw Terminal Accessory section Configuring the SCC 68 as an SCC Carrier To configure the SCC 68 as an SCC carrier accessory for a DAQ device using Measurement amp Automation Explorer MAX complete the following steps 1 Navigate to MAX by selecting Start All Programs National Instruments Measurement amp Automation 2 Inthe left pane of MAX expand Devices and Interfaces 3 Right click NI DAQmx Devices and select Create New NI DAQmx Device NI DAQmx SCC Connector Block SCC 68 4 Select the DAQ device that the SCC 68 is connected to from the DAQ Device menu For devices with multiple connectors select the connector that is cabled to the DAQ device 5 For each SCC module physically installed in the SCC 68 carrier add a corresponding entry in the SCC 68 configuration window To add the SCC click the Socket drop down list and select the correct module 6 Ifthe module name does not
6. and any of the following conditions apply to your application e More than two SCC AI0Ox or SCC SG24 modules are installed in the SCC 68 e The cable connecting the DAQ device to the SCC 68 is longer than 2 m e You measure less than 4 50 V between terminals 8 and 50 when the SCC 68 is under full load e You are using a PCMCIA device such as the NI DAQCard 6024E e You are using 5V to power custom circuitry on the breadboard area Tf the 5V power from the DAQ device drops below about 4 5 V SCC modules installed in the SCC 68 will not operate properly The LED in the SCC 68 will flash seven times per second to indicate this condition There is no error or notification in software National Instruments Corporation 19 SCC 68 User Guide Figure 14 shows the power supply path and power distribution of the SCC 68 External Power Supply enp e r i 5V i VISE np b o swt Filter 5V Filtered E a PC or PXI 77775 P Switching Y a Chassis _ Current 5V EE Power Supply DN Power Limiter E Supply 1 i Voltage l SCC H l Mod 2 DAQ Device Monitor LL LED 5 Sm UT sce Vv Mod 3 5V Screw GND e i Terminal Pin 8 SCC i Mod 4 SCC 68 SCC 68 User Guide Figure 14 SCC 68 Power Distribut
7. appear in the list either the module is not allowed in that location or you do not have the current version of NI DAQ If you do not have the current version of NI DAQ download it from ni com downloads 7 Click OK after completing all SCC entries to finish the configuration process Configuring the SCC 68 as a Screw Terminal Accessory To configure the SCC 68 as a screw terminal accessory for a DAQ device using Measurement amp Automation Explorer MAX complete the following steps 1 Right click the DAQ device that the SCC 68 is connected to from the DAQ Device menu and choose Properties 2 Click the Accessory tab and select SCC 68 28 ni com Configuring Channels and Tasks This section applies only if you are programming the device using NI DAQmx or NI application software A physical channel is a terminal or pin at which you can measure or generate an analog or digital signal A virtual channel is a collection or settings such as a name a physical channel input terminal connections the type of measurement or generation and can include scaling information In NI DAQmx virtual channels are integral to every measurement In NI DAQmx use the DAQ Assistant accessible from MAX or NI application software to configure virtual channels and measurement tasks Refer to the DAQ Assistant Help and the Measurement amp Automation Explorer Help for NI DAQmx You also can configure virtual channels with the NI DAQmx API in your
8. terminals shown in item 5 of Figure 6 unconnected Cold Junction Temperature Measurement Accuracy Note For the most accurate thermocouple measurements NI recommends using an SCC TC series module For more information refer to ni com products Temperature differences between the cold junction temperature sensor and the actual cold junction formed by a thermocouple connected to the screw terminals will directly contribute to thermocouple measurement errors With minimal loading on the SCC 68 15V power supply the temperature difference between the screw terminals of the SCC 68 is typically less than 1 C Variations in the ambient temperature SCC module heat dissipation and heat conducted along thermocouple wire can all contribute to isothermal errors across the screw terminals For more information on thermocouple theory and use refer to the Taking Thermocouple Temperature Measurements tutorial at ni com zone Bus Terminals The bus terminals provide an easy interface for supplying external power extra ground terminals or grounding to any sensors or custom circuits used in the SCC 68 There are two buses Bus A and Bus B where all four screw terminals on each side are connected together internally To use these terminals you may connect the power supply from an external source and then use the remaining three terminals to connect sensors or circuits inside the SCC 68 80 _ 81 Bus A 82
9. the SCC 68 enclosure To desolder on the SCC 68 vacuum type tools work best National Instruments Corporation 13 SCC 68 User Guide Using the Temperature Sensor for Cold Junction Compensation CJC The SCC 68 has a temperature sensor connected to screw terminals 70 and 71 as shown in Figure 8 Refer to the Specifications section for the formula for converting the measured voltage on CJC to temperature 5V R 4 870 Q CJC SQ 70 S I R7 5 KQ at 25 C Al GND Figure 8 SCC 68 Temperature Sensor Connection To use the temperature sensor for cold junction compensation of thermocouple measurements connect CJC terminal 70 to AI channel 7 of the SCC 68 Figure 9 shows the temperature sensor connected to AI 7 CJC 70 Al GND oe 3 Al 7 H el Gi al 15 se W I Al GND 41 42 SE Ee 43 SR e Figure 9 Connecting the CJC Sensor to Channel Al 7 You must also ensure that the temperature sensor is powered by one of the following e The DAQ device Move the power switch to SELF POWER shown in item 4 of Figure 6 e An external power supply Refer to the Power Supply Considerations section for more information SCC 68 User Guide 14 ni com To remove power from the temperature sensor complete the following steps 1 Move the power switch to EXTERNAL POWER shown in item 4 of Figure 6 2 Leave the external power screw
10. 54 cm ym in 3 51 cm 1 38 in P y 24 46 cm 9 63 in 1 Mounting Holes 3 I O Connector Cable 2 Directional Mounting Hole Figure 3 SCC 68 Mounting Dimensions SCC 68 User Guide 6 ni com Installing Rubber Feet Rubber non skid feet are shipped with the device that can be attached for secure desktop use To install the rubber feet remove adhesive backing and affix to the SCC 68 where indicated in Figure 4 1 Rubber Feet 3 Stacking Grooves 2 Wall Mounting Holes Figure 4 SCC 68 Mounting Features National Instruments Corporation 7 SCC 68 User Guide Connecting to the DAQ Device The following sections describe how to connect the SCC 68 to the DAQ device The SCC 68 is designed to be used with M Series and E Series DAQ devices only Other 68 pin devices may not function properly with the SCC 68 Using the SCC 68 with 16 Al Channel M Series Devices To use the SCC 68 with a 16 AI channel M Series device complete the following steps 1 Attach the quick reference guide shown in Figures 21 and 22 to the top of the SCC 68 enclosure as shown in Figure 1 The quick reference guide for Connector 0 included in the SCC 68 kit shows the pin assignments of the SCC 68 and other useful information 2 Attach the SCC 68 to the DAQ device using one of the following cables e SHC68 68 EPM e SHC68 68 e RC68 68 3 Proceed to the Taking
11. 68 User Guide Tightening torque 0 0 ee eeeeeeeeeees 0 5 to 0 6 N m 4 4 to 5 3 Ib in Strip length issiria 7 mm 0 27 in Maximum Working Voltage UN Caution Refer to the DAQ device documentation for the voltage specifications for the DAQ device UN Caution Ensure that signals connected to SCC modules are used within the voltage ratings of the modules to which they are connected Refer to the SCC XX user manual for the voltage specifications for the SCC module Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth cccceeeeessssssseseseeeeees 11 VDC Measurement Category I UN Caution Do not use the SCC 68 for connections to signals or for measurements within Categories II III or IV Environmental Operating temperature 0 0 ee 0 to 55 C Storage Temperature 20 to 70 C Fmi ditya ainen 5 to 90 RH noncondensing Maximum alomde 2 000 meters Pollution Degree indoor use only 2 Shock and Vibration Operational bock 30 g peak half sine 11 ms pulse Tested in accordance with IEC 60068 2 27 Test profile developed in accordance with MIL PRF 28800F Random vibration Operating sccescescevevesescerenesenevsevesseese 5 to 500 Hz 0 3 gins Nonoperating e eseeeseeeeeereeeerrererrees 5 to 500 Hz 2 4 gins Tested in accordance with IEC 60068 2 64 SCC 68 User Guide 36 ni com EI Note Nonoperating random vibration profiles for the SCC 68
12. G OI any alz GND alr SL Iyl ez LC ELIONE O GND Iv ze AND Iv 62 GND Iv Zz GND Iv vz ZNS oro oz LE Iy e9 OL Iv Le 6 Iy 99 gg leg Soo Soo F SLNAINNLLSNI qf lv joe ci s9 Liv ee O lv 89 jeqe7 soualajay 89 099S TVNOLLVN 2 National Instruments Corporation National Instruments NI ni com and LabVIEW are trademarks of National Instruments Corporation Refer to the Terms of Use section on ni com 1legal for more information about National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies 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 2006 National Instruments Corporation All rights reserved 374748A 01 Aug06
13. GND SCC 68 User Guide 16 ni com Supported SCC Modules The SCC 68 supports all analog input and digital I O SCC modules Table 1 shows all SCC modules that are compatible with the SCC 68 Table 1 SCC 68 Compatible SCC Modules SCC Module Type SCC AIOx Isolated Voltage Input SCC TCOx Thermocouple Input SCC LPOx Lowpass Filters SCC SG0x Strain Gauge Input SCC SG24 Load Cell Input SCC ACCO1 Accelerometer Input SCC FTO1 Feedthrough SCC RTDO1 RTD Input SCC FVO1 Frequency Input SCC CI20 Current Input SCC A10 Voltage Attenuation SCC DI01 DO01 Isolated Digital I O SCC RLYO1 SPDT Relay Connecting Signals to SCC Modules in the SCC 68 UN Caution Always refer to the specifications in the SCC XX module user guide before connecting signals Exceeding specified module ratings can create a shock or fire hazard and can damage any or all of the devices connected to the module UN Caution The captive screw must be used to secure the enclosure when connecting hazardous voltage gt 30 Vims 42 4 V px 60 VDC signals to an SCC RLYO1 module Disconnect the 68 pin cable for the DAQ device before installing or removing any SCC modules National Instruments Corporation 17 SCC 68 User Guide A Caution You must use an SCC connector backshell when connecting hazardous voltage gt 30 Vims 42 4 Vpx 60 VDC signals to an SCC RLYO1 module Refer to Figure 12 Figure 12 SCC Connector Bac
14. Manual or the E Series Help The following cases should also be noted Grounded Signal Sources This configuration is not recommended as described in the M Series User Manual or the E Series Help Floating Signal Sources Connecting a floating signal source in RSE mode is not recommended When measuring floating signals with the SCC 68 configured for SCC modules use the NRSE measurement configuration 26 ni com If RSE is used to measure floating signals there will be a measurement error due to the current being drawn by the SCC 68 from the DAQ device 5V power supply This potential will vary depending on the length of the cable connecting the DAQ device to the SCC 68 and the amount of current being drawn from the 5V power supply by the SCC 68 Figure 18 shows this measurement error SCC 68 DAQ Device Power Switch AEN o On A D Power for 5V gt i SCC Modules and CJC Sensor Not Recommended Al GND in Pin 67 Floating i RSE M fs Signal Sk oi SE Mode 4 Figure 18 Floating Signal Connected in RSE Mode Taking Measurements with NI DAQmx Before beginning any signal conditioning applications with the SCC 68 make sure you have the following software and documentation materials Q NI DAQm x 8 1 or later software and documentation LI One of the following software packages for development LabVIEW
15. Measurements with NI DAQmx section for information about using the SCC 68 in measurement applications B Note Some M Series devices are available with a 37 pin connector The SCC 68 cannot be used with these devices Using the SCC 68 with 32 Al Channel M Series Devices SCC 68 User Guide The 32 AI channel M Series DAQ device has two connectors e Connector 0 AI 0 15 e Connector 1 AI 16 31 The SCC 68 can be used with Connector 0 or Connector 1 To use the SCC 68 with a 32 AI channel M Series device using Connector 0 complete the following steps 1 Attach the quick reference guide shown in Figures 21 and 22 to the top of the SCC 68 enclosure as shown in Figure 1 The quick reference guide for Connector 0 included in the SCC 68 kit shows the pin assignments of the SCC 68 and other useful information 8 ni com 2 Attach the SCC 68 to Connector 0 of the DAQ device using one of the following cables e SHC68 68 EPM e SHC68 68 e RC68 68 3 Proceed to the Taking Measurements with NI DAQmx section for information about using the SCC 68 in measurement applications To use the SCC 68 with a 32 AI channel M Series device using Connector 1 complete the following steps 1 Attach the SCC 68 to Connector 1 of the DAQ device using one of the following cables es SHC68 68 EPM e SHC68 68 e RC68 68 2 Refer to Figure 22 in the Quick Reference Guides section for the quick reference guide for the SCC 68 connected to Connect
16. Terminals Bus Screw Terminals AO Screw Terminals 10 Strain Relief Wire Entry National Instruments Corporation Figure 6 SCC 68 Features 11 SCC 68 User Guide Screw Terminals The SCC 68 provides screw terminals for easy I O connectivity Device Pinouts For a list of pins and their corresponding signal assignments refer to the quick reference guide for the device which can be found in the Quick Reference Guides section of this document Refer to the DAQ device documentation for additional details about the DAQ device signals Wiring to Screw Terminals To connect signals to the SCC 68 complete the following steps while referring to Figure 1 1 Disconnect the 68 pin cable from the SCC 68 2 Remove the top cover as directed in the Opening the Enclosure section 3 Slide the signal wires through the wire entry strain relief opening For more information about using strain relief with the SCC 68 refer to the Integrated Strain Relief section 4 Connect the wires to the screw terminals by stripping off 7 mm 0 28 in of the insulation inserting the conductors into the terminals and tightening the screws 5 Close the top cover You can now connect the SCC 68 to the 68 pin I O connector Integrated Strain Relief Strain relief for the I O connector wires is provided through a labyrinth style wire entry at the front of the SCC 68 device For larger gauge connector wires and jacketed cables bundle the wi
17. UE USER GUIDE SCC 68 1 0 Connector Block with 4 SCC Signal Conditioning Slots for DAQ Devices The SCC 68 is an I O connector block for easy signal connection to a National Instruments M Series or E Series DAQ device The SCC 68 features screw terminals and a general breadboard area for I O signal connection and bus terminals for external power and grounding The SCC 68 has four SCC slots for use in integrating thermocouple strain gauge RTD input frequency input current input voltage attenuator lowpass filter load cell input accelerometer feedthrough SPDT relay isolated digital I O and isolated voltage input SCC modules into the measurement system Contents VE ee 3 Using the SCC 68 Enclosure 0 cece es eeseeseeseceseeseeeseseeeeeeseeeeeeaeeseees 4 Opening the Enclosure s ccccisesssscbeseveaseotssasssnesestsuessestuessosteeann ces 4 Closing th Enclosure esegr stert kee ugte gege NEE 5 Stacking and Wall Mounting 00 0 eee ee eeeeeeceeseeeeeeeeesseeseeeeeens 6 Installing Rubber Feet ccno 7 Connecting to the DAQ Device occ eee eeeereseeeeseeeeeseeseeeseeaeeeeeaes 8 Using the SCC 68 with 16 AI Channel M Series Devices 8 Using the SCC 68 with 32 AI Channel M Series Devices 8 Using the SCC 68 with a 68 Pin E Series Device eee 9 Using the SCC 68 with the NI 6025E NI 6033E or NI 6071E 10 SGC 68 F atUreS poserer ee eege LEE EEE EES de 11 Screw Terminals perisian e aaa ta
18. ULLSN IO SOUeleiet 89 909S TWNOILVN ist t PON DOS EPON DOS PPONW DOS POW OOS troa 2 od Je 60d Lt gud lee an9a jz ano a an9a Z ano a r an9 Iv ze an9 lv 6z an9 Iw Zz ANd Iv vz Zev feo 92 Iv Le Sz iv 99 vz Iv ve 6r Iv foe 84 Iy len Zi lv ee 94 Iv 89 ni com 40 SCC 68 User Guide ag OVC Savas J 104 aping souaalay yoIND ez an SCC 68 User Guide 41 gt L ww Au Zz aBney due v snd g sng S8OIABP WOS UO ON GND Ov Ss OV te SE 2 GTSIHS ONE Ov rs S4 RET es qTAIHS z 0 OV ce 69 aN9 A v0d 6L du 1X3 OV 02 es ans a S Od LS ONS IY St So oS ano a JSNIS Iy Z9 i d AA Od r Eet ales DG sowy oos 404 OIWL LYVLS 1V 0 Idd bb vV vv GND a m OIL 298 Tit ldd OL ZL IV L9 gp JANOD ATOH IY X70 ANOO IS ldd Ev AEE OUS YL9 ldd zv a ONS Iv 79 Z LNOO LO L Y Stee ag ALOV ldd e fo Sos X70 dINVS OV S ldd 9 Ee IHL LYVLS OW 9 ldd S e ONE IV 6S 8L GqNoa wes 10 ANYS IW 2 Idd ee El LNO OJH VPON DOS EPON DOS cho DOS POW OOS mi OHS 0 419 8 ldd f7 See ae To a ano los FIV 0 419 6 lda t ajek i ate hal anew i PEIOND a ONG Oz ON
19. a Task eieiei Ee 29 Configure Global Virtual Channel 31 Using Your Task in an Application cece eee eseeseeeseeneeeseeeeees 32 ee EE 33 Quick Reference Guides 38 2 ni com Conventions 3 A A A italic monospace SCC XX The following conventions are used in this manual Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example AO lt 3 0 gt The symbol leads you through nested menu items and 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 When this symbol is marked on the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury 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 It
20. alic text denotes variables emphasis a cross reference or an introduction to akey 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 This name refers to any SCC module National Instruments Corporation 3 SCC 68 User Guide Using the SCC 68 Enclosure UN Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires SCC Slots Screw Terminals 68 Pin I O Connector Enclosure Cover Quick Reference Guide ahWN oO OO JO Enclosure Base External Power Screw Terminal External Power Switch Strain Relief Wire Entry Figure 1 SCC 68 Parts Locator Diagram Opening the Enclosure To open the SCC 68 use a flathead screwdriver to loosen the captive screw at the front of the device After the screw is loosened pull up on the front of the enclosure cover to open The top half of the SCC 68 enclosure can be removed completely SCC 68 User Guide 4 ni com Closing the Enclosure To close the SCC
21. application program A task an important concept for NI DAQm x is a collection of one or more virtual channels with timing triggering and other properties Conceptually a task represents a measurement or generation you want to perform You can set up and save all of the configuration information in a task and use the task in an application In NI DAQmx you can configure virtual channels as part of a task or separate from a task Virtual channels created inside a task are local virtual channels Virtual channels defined outside a task are global virtual channels You can create global virtual channels in MAX or in your application software and then save them in MAX You can use global virtual channels in any application or add them to a number of different tasks If you modify a global virtual channel the change affects all tasks in which you reference that global virtual channel Configure a Task When using NI DAQmx configure tasks with the DAQ Assistant To create tasks using the SCC 68 you must have NI DAQm x version 8 1 or later e To launch the DAQ Assistant in MAX right click Data Neighborhood and select Create New In the Create New window select NI DAQmx Task and click Next If you are using a remote RT target expand your target then right click Data Neighborhood and select Create New e You also can open the DAQ Assistant directly within NI application software Refer to the help of your software package for more deta
22. bout this setting Save your configuration Click Test Verify your data in the window that opens If the data is incorrect verify the settings in the DAQ Assistant window 31 SCC 68 User Guide You now can use the global virtual channel in an application or add the global channel to a task Refer to the DAQ Assistant Help for more information about creating tasks and virtual channels and using them in an application In LabWindows CVI and Measurement Studio you cannot directly create a global virtual channel you must create them in MAX as previously described Using Your Task in an Application SCC 68 User Guide Complete the following steps to use a measurement task in your application Refer to the DAQ Assistant Help for more information about using a task or generating code To run examples without hardware installed you can use NI DAQmx simulated devices In MAX refer to the Measurement amp Automation Explorer Help for NI DAQmx by selecting Help Help Topics NI DAQm x for instructions about creating NI DAQmx simulated devices and importing NI DAQm x simulated device configurations to physical devices LabVIEW 1 Open a blank VI in LabVIEW 2 Place the following constant on the block diagram from the functions palette NI Measurement DA Qmx Data Acquisition DA Qmx Task Name Constant 3 Select the task from the pull down menu 4 Right click the VI and select Generate Code Example to generate the code t
23. exceeds the requirements of MIL PRF 28800F Class 3 Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL61010 1 CAN CSA C22 2 No 61010 1 3 Note For UL and other safety certifications refer to the product label or visit ni com certification search by model number or product line and click the appropriate link in the Certification column Electromagnetic Compatibility This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement control and laboratory use e EN 61326 EMC requirements Minimum Immunity e EN 55011 Emissions Group 1 Class A es CE C Tick ICES and FCC Part 15 Emissions Class A ei Note For EMC compliance operate this device according to product documentation CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows e 73 23 EEC Low Voltage Directive safety e 89 336 EEC Electromagnetic Compatibility Directive EMC ei Note 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 Waste Electrical and E
24. ge Input Setup Io MyvoltageTask Vokage EB setings A Calibration Devices and Interfaces Voltage i G GPIB0 PCI GPIB Voltage1 NI DAQmx Devices Voltage2 Max 5 WP NI PCI 6052E PCI 6052E Min 5 5CC 68 SCC1 1 NISCC AI04 SCC1 2 NI SCC AI03 SCC1 3 NI SCC AI02 SCC1 4 MSC SCC1 Ports Serial amp Parallel Av FEI PXI System Unidentified Custom Scaling i Traditional NI DAQ Legacy De e lt No Scale gt la Historical Data G Scales EI Software Task Timing E Task Triggering EI vI Logger Tasks F ES MI Drivers Volts x Terminal Configuration Differential VK O 1 Sample On Demand 1 Sample HW Timed N Samples O Continuous Rate Hz 1k Samples To Read 100 Clock Type Ad Internal v ai NI DAQms Task Connection Diagram Figure 19 A Task in the DAQ Assistant 30 ni com Configure Global Virtual Channels If you want to use virtual channels in multiple NI DAQmx tasks or applications configure global virtual channels with the DAQ Assistant You can launch the DAQ Assistant to create a global virtual channel in MAX or in LabVIEW To open the DAQ Assistant in MAX right click Data Neighborhood and select Create New In the Create New window select NI DAQmx Global Virtual Channel and click Next To open the DAQ Assistant directly in LabVIEW to create a global virtual channel drop a DAQmx Global Channel con
25. ils National Instruments Corporation 29 SCC 68 User Guide The DAQ Assistant prompts you to create a new task 1 SCC 68 User Guide Select an I O type such as analog input For thermocouple measurements you must first ensure the hardware is configured correctly and that the SCC 68 has been configured in MAX For more information refer to the Configuring the SCC 68 section Select the measurement or generation to perform based on the hardware functionality of the module Table 1 lists the measurement types in NI DAQmx and how they correspond to the SCC modules For additional information about SCC XX module specific channel task settings refer to the SCC Quick Start Guide and the SCC XX module user guide for the SCC device Select the sensor to use if applicable for that measurement Select the physical channel s from which to create local virtual channels in the task Alternatively you can add existing global virtual channels to the task or copy information from an existing global virtual channel to the local virtual channel Click Next If you launched the DAQ Assistant from MAX type the new task name Click Finish Set any timing and triggering information for the task CY MyVoltageTask Measurement amp Automation Explorer Joey File Edit View Tools Help Configuration al save Undo fedo Test AddChannels X Remove Channels 4 My System E Remote Systems m sonar ce Show Details Volta
26. ion Block Diagram LED The LED in the SCC 68 shows the status of the power supply The SCC 68 monitors the voltage of the 5V signal from the DAQ device as shown in Figure 14 Table 2 shows the correlation between power levels in the SCC 68 and the LED statu S Table 2 SCC 68 Power Levels Voltage on 5V Signal LED Status Meaning 24 5 V On Power on gt 2 V and lt 4 5 V Blinking Power insufficient lt 2 V Off Power is off or power insufficient and 4 5 V Due to component variations the threshold for the LED can vary between 4 25 V T Refer to the Power Supply Considerations section for more information about supported SCC module configurations and other SCC 68 power supply issues 20 ni com Installing the SCC Modules in the SCC 68 To install the SCC modules on the SCC slots of the SCC 68 plug the SCC modules onto the appropriate connector block sockets When properly oriented SCC modules plug easily onto the connector block socket Never force an SCC module onto the socket SCC Connector Pinouts This section contains descriptions of all the signals carried by the 20 pin sockets on the SCC 68 carrier You can also access these signals by using an SCC feedthrough module such as the SCC FTO1 For more information about the SCC 68 carrier connector locations refer to the SCC Quick Start Guide at ni com manuals Refer to Figure 15 for the pin assignments of the SCC sockets
27. kshell Refer to the SCC XX user documentation for additional safety information To connect an SCC module to the SCC 68 complete the following steps 1 Remove power from the signal lines 2 Strip insulation from the ends of the signal wires Refer to the SCC XX user documentation for the exact strip length for the module 3 Insert the conductors into the screw terminals The SCC XX module has a fixed screw terminal receptacle and a removable screw terminal block as shown in Figure 13 1 SCC Screw Terminal Receptacle 2 Removable Screw Terminal Block Figure 13 SCC XX Two Part Screw Terminal System 4 Tighten the screws to 0 5 to 0 6 N m 4 4 to 5 3 1b in of torque SCC 68 User Guide 18 ni com Power Supply Considerations The 5V power provided by the DAQ device is distributed to all components in the SCC 68 and is also used to generate 15V power for SCC modules Figure 14 shows the power distribution of the SCC 68 If your application exceeds the current limitation of the DAQ device you will need to connect an external power supply such as the External Power Supply for the SCC 68 Accessory Part Number 77964 1 01 to the SCC 68 To use an external power supply with the SCC 68 connect the power supply to the screw terminals shown in item 5 of Figure 6 and move the power switch shown in item 4 of Figure 6 to EXTERNAL POWER You may need an external power supply if you have SCC modules installed
28. lectronic Equipment WEEE KH EU Customers At the end of their life cycle all products must be sent toa WEEE recycling center For more information about WEEE recycling centers and National Instruments WEEE initiatives visit ni com environment weee htm National Instruments Corporation 37 SCC 68 User Guide Quick Reference Guides This section provides the quick reference guides for use with Connector 0 and Connector 1 of 68 pin M Series devices and E Series devices The quick reference guides provide information about pin placements their corresponding signal assignments and wire stripping length for signal connections SCC 68 User Guide 38 ni com 9149q OYA 0 J0199UU04 Uld 89 SalJaS W 104 ping aouaalay JANY Le an gt L ww AIuL ZZ ney due ONE OV SS L OV L ONE OV Kei 0 ON E 0 lddV D ONE Iv 19 ASNAS IV CH ON IY OL SSN3S IV YV 193NNO9 SAINGOW SOWNV 99S HOS cL iv t Iv ONG IY El Iy SIV ONE IV vL IY 9 IY GND IY SLIV ZIV v sng LO OVZSE6L N d g sng 1alHS 1alIHS 1aIHS 1alHS v 0d S 0d 90d ONG a ONG a ONG a 20d ASt cd ldd 0 Ld 0 ldd bb d b ldd Z bd ldd ON a E GdILL ldd ELO ldd FLditp ldd Gd ldd 9 Ld 9 ldd Ltd Z ldd 0 Zd 8 ldd ONG a Ved el ldd ONG a Ged El ldd ONG a
29. mended input configurations for floating signal and ground referenced signal sources Table 3 Recommended Al Ground Reference Setting when SCC Modules are Installed Signal Source Type AI Ground Floating Signal Sources Ground Referenced Reference Setting Not Connected to Building Ground Signal Sources Differential DIFF Best Best Referenced Not Recommended Not Recommended Single Ended RSE Non Referenced Good Not Recommended Single Ended NRSE This section assumes that when SCC modules are installed AI SENSE and AI GND on the DAQ device are connected together If you are not using SCC modules in the system refer to the M Series User Manual or the E Series Help for information about connecting analog input signals Differential Single Ended SCC 68 User Guide Refer to the NI Developer Zone document Field Wiring and Noise Considerations for Analog Signals for more information To access this document go to ni com info and enter the info code rdfwin A differential DIFF connection is a connection in which the AI signal has its own reference signal return path as described in the M Series User Manual or the E Series Help Use differential input connections for any channel that meets any of the following conditions e The input signal is low level less than 1 V e The leads connecting the signal to the device are greater than 3 m 10 ft e The input signal requires a sepa
30. o run the task 5 Run the program from the front panel LabWindows CVI Refer to ni com info and enter the information code rddq73 for step by step instructions for using a task in LabWindows CVI Measurement Studio Refer to ni com info and enter the information code rddaqms for step by step instruction for using a task in Measurement Studio 32 ni com Specifications This appendix lists the SCC 68 specifications These ratings are typical at 25 C unless otherwise stated Power Requirement Power consumption at 5 VDC 5 Typical ninnan a 1 mA with no signal conditioning installed ei Note The maximum power consumption of the SCC 68 is a function of the SCC modules installed and any circuits constructed on the general purpose breadboard area Refer to the Power Supply Considerations section for more information External Power Supply Requirements Using an external power supply is optional Any external power supply used with the SCC 68 must meet the following requirements Voltage outmut ee eects eeeeeeees 4 75 V min 5 25 V max Current Output uean ie n 2 A max minimum current requirement is load dependent External Power Supply Protection The SCC 68 external power supply screw terminal is protected against overcurrent overvoltage and reverse voltage OVELCUITENE erisir resnici Fused at 2 ADC Overvoltage and reverse voltage 20 VDC max 15V Power Supply The 15V power supply is onl
31. or of the DAQ device The guide shows the pin assignments of the SCC 68 and other useful information Attach a copy of this guide to the top of the SCC 68 enclosure as shown in Figure 1 Using the SCC 68 with a 68 Pin E Series Device To use the SCC 68 with a 68 pin E Series device complete the following steps 1 Attach the SCC 68 to the DAQ device using one of the following cables e SH68 68 EP e R68 68 2 Refer to Figure 23 in the Quick Reference Guides section for the quick reference guide for the SCC 68 connected to the E Series DAQ device The guide shows the pin assignments of the SCC 68 and other useful information Attach a copy of this guide to the top of the SCC 68 enclosure as shown in Figure 1 National Instruments Corporation 9 SCC 68 User Guide Using the SCC 68 with the NI 6025E NI 6033E or NI 6071E To use the SCC 68 with the NI 6025E NI 6033E or NI 6071E complete the following steps 1 Attach the SCC 68 to the DAQ device using an SH1006868 cable This cable has two 68 pin connectors labeled MIO 16 and Extended I O Connect the MIO 16 connector to the SCC 68 Refer to Figure 5 SCC 68 E Series 100 Pin Device Extended WO Connector SCB 68 or Other Terminal Block SH1006868 Cable Figure 5 Connecting a 100 Pin DAQ Device to an SCC 68 Connector Block and Another Terminal Block You cannot use the Ex
32. r Guide Direct Access to SCC signals When no SCC module is installed in a socket you can access the AI and DIO signals on that SCC socket with screw terminals The screw terminals are located behind each SCC socket as shown in Figure 6 UN Caution When an SCC module is installed do not connect signals to the five corresponding screw terminals behind the module Doing so can result in unpredictable behavior in your application Analog Input Measurement Considerations You can measure analog input signals with the SCC 68 the following ways e Connect AI signals to SCC modules e Connect AI signals to SCC 68 screw terminals which get routed to the DAQ device If you are not using SCC modules in the system refer to the M Series User Manual or the E Series Help for information about connecting analog input signals If you are using SCC modules for some of the AI signals you can also measure other AI signals using the AI screw terminals in the SCC 68 Refer to Figure 6 for the location of the AI screw terminals This section describes some considerations for connecting these AI signals to the SCC 68 When using SCC analog input modules you should connect AI SENSE to AI GND as shown in Figure 11 This section only addresses measurement considerations for signal sources that are connected to analog input channels not used by installed SCC modules National Instruments Corporation 23 SCC 68 User Guide Table 3 summarizes the recom
33. rate ground reference point or return signal e The signal leads travel through noisy environments A single ended connection is a connection in which the device AI signal is referenced to a ground that it can share with other input signals National Instruments M Series and E Series devices provide two single ended connection configurations 24 ni com Use single ended input connections if the input signal meets the following conditions e The input signal is high level greater than 1 V e The leads connecting the signal to the device are less than 3 m 10 ft e The input signal can share a common reference point with other signals Differential input connections are recommended for greater signal integrity for any input signal that does not meet the preceding conditions Non Referenced Single Ended NRSE Refer to the NRSE connection considerations described in the M Series User Manual or the E Series Help If you have SCC modules installed in the SCC 68 the following cases should also be noted Grounded Signal Sources If you have SCC modules installed in the SCC 68 differential measurements are recommended over NRSE measurements When you have SCC modules installed connect AI GND to AI SENSE If you connect the ground of the signal source to AI SENSE you are also shorting it to AI GND Connecting the ground of the signal source to AI GND introduces a ground loop and ground loop induced errors Figure 16 shows this meas
34. res together and secure the wires to the holes in the wire entry opening using the provided cable ties For smaller gauge connector wires 26 AWG 30 AWG thread the wires through the strain relief posts located on the side opposite the wire entry By lacing the connector wires through these posts movement is limited EI Note Route all SCC signals through the left wire entry side of the SCC 68 Route all other signals through the right wire entry side SCC 68 User Guide 12 ni com 11 28 48 61 O O USE SCC CONNECTOR BACKSHELL FOR HAZARDOUS LIVE SIGNALS gt 42 4 Vpk 60VDC 73 ses oe ege SE Q SCC Mod SCC Mod 4 RI SCC 68 al BQ corrent 2008 D 7 Left Wire Entry Right Wire Entry 1 Small Gauge Strain Relief Posts 2 Larger Gauge Cable Tie Holes Figure 7 SCC 68 Strain Relief SCC Modules The SCC 68 can accept SCC modules for integrating signal conditioning into your application Refer to the Using SCC Modules with the SCC 68 section for more information Breadboard Area The SCC 68 features a general breadboard area for custom circuitry such as filtering or attenuation For soldering components to the underside of the breadboard remove the printed circuit board by carefully snapping it loose from
35. sduss eats ees 12 Teresa aiea N NA 12 Wiring to Screw Termmnals eeeeeeeeceseeeeeseeeeeeeeeees 12 Integrated Strain Relief 12 e E UE 13 Breadboard Areas sy utert guons neiaa a aeeai EN a ESS 13 Using the Temperature Sensor for Cold Junction Compensation EE 14 Cold Junction Temperature Measurement Accuracy 15 NATIONAL R INSTRUMENTS SCC 68 User Guide Bus Terminaliniai A aise tein oe eee eae 15 Power Supply ix fs ege eege aere ened etn geet e 16 Using SCC Modules with the SCC 68 ooo eee eeeeseeseceetseeeeeeeees 16 Supported SCC Modules heee E pa E EE 17 Connecting Signals to SCC Modules in the SC 17 Power Supply Constderatons 19 ED EE 20 Installing the SCC Modules in the SCC o 21 SCC Connector Dnoute eee ceceseceeeesecseeeseesecseeeaeenseeasenes 21 Direct Access to SCC agnals ieri 23 Analog Input Measurement Considerations eee eee eeeeseeeeeereeees 23 Differential ccc eessen EES 24 Lamp glec uge geed aaa tees Re Aer 24 Non Referenced Single Ended NRSE AA 25 Grounded Signal Sources 25 Floating Signal Sources 26 Ground Referenced Single Ended RS 26 Grounded Signal Sources 26 Floating Signal Sources 26 Taking Measurements with NI DAQMX 000 eee cece eee ceeeseeeeeeseeeneenees 27 Configuring the SCC 68 ceinec a a r A RER 28 Configuring the SCC 68 as an SCC Camer 28 Configuring the SCC 68 as a Screw Terminal Accessory 28 Configuring Channels and Taske A 29 Configute
36. tended I O connector with an SCC 68 Use another terminal block such as the SCB 68 or CB 68LPR with the Extended I O connector 2 Refer to Figure 23 in the Quick Reference Guides section for the quick reference guide for the SCC 68 connected to the E Series DAQ device The guide shows the pin assignments of the SCC 68 and other useful information Attach a copy of this pinout to the top of the SCC 68 enclosure as shown in Figure 1 SCC 68 User Guide 10 ni com SCC 68 Features The following sections describe the hardware features of the SCC 68 FOR PATENTS NI COM PATENTS 33 S ID 9 O On 24 ID 27 O 9 2 S Geo Doc EH BN SIGNALS gt 42 4 Vpk 60VDC SCC Mod 1 SCC Mod 2 ROUTE SCC SIGNAL WIRES ONTHIS SIDE SCC Mod 3 USE SCC CONNECTOR BACKSHELL FOR HAZARDOUS SCC 68 SCC Mod 4 g Ae Ris HEET Bat TNA Si Si D DASA DPRVSPSPDSSOSDOVSNGes 57 23 25 59 26 28 61 DIGGSLIDOOON DISSDID o e D l O e ooo SCC Slots SCC Screw Terminals 68 Pin I O Connector External Power Switch External Power Screw Terminals akon oO OO JO DIO Screw Terminals Al Screw
37. trol on the front panel right click it and select New DAQm x Channel The DAQ Assistant prompts you to create a new global virtual channel by selecting an I O type such as analog input the measurement or generation to perform the sensor applicable for that measurement and the physical channel from which to create a global virtual channel The DAQ Assistant prompts you to create a new global virtual channel L H 3 National Instruments Corporation Select an I O type such as analog input Select the measurement or generation to perform Choose the sensor to use if applicable for that measurement A dialog box opens for the task you have specified Select the physical channel from which to create a global virtual channel Alternatively you can copy information from an existing global virtual channel Click Next Type the new global virtual channel name Click Finish Configure the onboard CJC sensor if necessary To use the onboard CJC sensor for thermocouple measurements ensure that the CJC sensor is wired to AI 7 then select Built In for the CJC source If this option is not available check your configuration For more information refer to the Configuring the SCC 68 section For CJC sensor wiring instructions refer to the Using the Temperature Sensor for Cold Junction Compensation CJC section Select the terminal configuration Refer to the Analog Input Measurement Considerations section for more information a
38. urement error SCC 68 DAQ Device Not Recommended Ground Referenced i i Sinal a d 3 F S l Al SENSE Pin 62 S NRSEMode gd E Al GND Pin 67 o i GE dee Figure 16 Ground Referenced Signal Connected in NRSE Mode National Instruments Corporation 25 SCC 68 User Guide The difference in potential between the ground of the signal source and AI GND causes an error when measuring the signal The amount of this error depends on several factors including the length of the cable connecting the DAQ device to the SCC 68 and the amount of current being drawn by the SCC 68 from the DAQ device 5V power supply Floating Signal Sources Floating signals can be measured in NRSE mode with AI SENSE and AI GND connected together with certain limitations This configuration can have implications depending on the bias resistor requirements of the signal source Refer to the M Series User Manual or the E Series Help for more information regarding floating source bias requirements SCC 68 DAQ Device Floating Signal a hg To i oa i AlSENSE Pin62 8 i NRSEMode Al GND Pin 67 Wrbteechecoe ste E I i iy i a CN Figure 17 Floating Signal Connected in NRSE Mode Ground Referenced Single Ended RSE SCC 68 User Guide Refer to the RSE connection considerations described in the M Series User
39. y accessible by SCC modules You may access it using an SCC FTO1 module Refer to Figure 14 and Figure 15 Tolerance nesies eeri aEg 5 Max load Current cccceeeeeeeeesereeeeees 50 mA National Instruments Corporation 33 SCC 68 User Guide Temperature Sensor SCC 68 User Guide Temperature sensor Ee E 0 3 C over a 0 to 55 C range KEE Thermistor Convert the voltage to temperature using the following Steinhart Hart equation T ee l Onas A B In R C In R where A 1 2873851 x 103 B 2 3575235 x 10 C 9 4978060 x 10 8 bid T 5 V7 where R 4 870 Q Vr is the CJC voltage measurement For more information about the temperature sensor refer to the Using the Temperature Sensor for Cold Junction Compensation CJC section 34 ni com Physical 530cm 1 17 78 cm gt lt lt gt 2 09 in 7 00 in NATIONAL INSTRUMENTS 24 46 cm 9 63 in Srila BS Figure 20 SCC 68 1 0 Connector Block Dimensions IW CLO Ht eieiei deser Aere teens 623 7 g 1 lb 6 0z T O conpnector orisirisii One 68 pin male SCSI connector SCC sockets Number of sockets cc0000eeeeeee 4 SCC types supported Analog input digital input output feedthrough Screw Termunals 84 54 AI AO DIO 20 SCC 8 bus 2 external power WALES EE 14 26 AWG 0 14 mm2 1 5 mm National Instruments Corporation 35 SCC
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