USER MANUAL
Contents
1. for i 0 1 lt 32 i bu3940 switchRelay viSession i 1 V LSE for i 0 i lt 12 i bu3940 switchRelay viSession i 1 relaysSet i bu3940 updateRelaysState viSession First of all the switching mode is set to be synchronous with software command to release change as the input trigger is irrelevant here it is disabled the third parameter selected as bu3940 ITRIG NONE The first for loop switches all relays off and the second loop sets relays state according to the relaysSet array values the first twelve relays are in use only Finally after setting the relays to desired state software issues update command to make relays switched as we are in synchronous mode the switching takes place only after synchronization event in this case software command When input trigger is used as a synchronization event bu3940_getTriggerStatus function can be use to determine the event occurrence Another way to notice the input trigger Copyright 2002 Bustec Production Ltd Page 25 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual arrival is to install an interrupt service routine which would react on output trigger signal The bu3940 enableOutputTrigger function installs user interrupt service routine for that purpose Page 26 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 39402. Relay A Overcurrent protection option COM o Front panel terminals B g i Relay B Overvoltage protection option Figure 1 Single channel configuration Optional low resistance resettable PTC fuses ensure protection of relays when faulty conditions overcurrent occur After a faulty condition is removed PTC fuse returns to low resistance state so device can be still used without costly service intervention Also optional overvoltage protection of relays is available which may increase relays lifetime when inductive loads are controlled Magnetic screening of electromechanical relays or usage of solid state semiconductor relays depending on version allows for dense packing and eliminates problems of magnetic interaction Copyright 2002 Bustec Production Ltd Page 5 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual 2 Installation 2 1 2 3 4 Unpacking and Inspection Before unpacking the ProDAQ 3940 relay function card check the exterior of the shipping carton for any signs of damage All irregularities should be noted on the shipping bill Remove the instrument from its carton preserving the factory packaging if possible Inspect the function card for any defect or damage Immediately notify the carrier if any damage is apparent Have a qualified person check the instrument for safety before use NOTE Proper ESD handling procedures must always be used wh
3. FCSERH Upper 16 bit of the serial number of the function card FCSERL Ke Lower 16 bit of the serial number of the function card Copyright 2002 Bustec Production Ltd Page 11 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual 3 5 Register Details 3 5 1 FCID FC_ADR 0H VX _ADR 0H FCID register contains identification number of function card type Readout should give value of 3940H t ss 14 3 12 ER 7 6 5 a WEEN Operation RO RO RO RO FO RO RO FO Ses ses Initial FC GEI BE 20400 3 5 2 FCVER FC_ADR 1H VXI_ADR 4H This is FC version register Readout from this register gives information about board revision and firmware version E ee ee S S Operation RO FO FO FO FO FO FO FO MEENE Initial Content ajor minor major minor FPGA version PCB version 3 5 3 FCCSR FC_ADR 2H VXI ADR 8H Control and Status register allows to switch board into Synchronous Update mode and to select event which will update all relays E E O et te fo ta te Operation RW RW T T TI S Initial Content CH CH Not used a oO GI e 5 0 O Z Z gt gt ol o Page 12 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM RESET This bit resets all relays to their default state open and resets configuration bits to initial state Write 0 Has no effe
4. Alternative types such as electromechanical armature relays or non instrumentation grade relays are lower cost but do not offer the consistent contact resistance long life and fast switching speed 3 1 3 Photovoltaic relays As a alternative to reed relays the PVG612 series photovoltaic single pole normally open solid state relays SSR can be used They can replace electromechanical relays in many applications SSRs offer improved system reliability since they have no moving parts or contacts to degrade They utilize International Rectifiers proprietary HEXFET power MOSFET as the output switch driven by an integrated circuit photovoltaic generator of novel construction The output switch is controlled by radiation from a GaAlAs light emitting diode LED which is optically isolated from the photovoltaic generator These units exceed the performance capabilities of electromechanical relays in operating life stability of on resistance insensitivity to magnetic fields and ruggedess They can be Copyright 2002 Bustec Production Ltd Page 7 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual successfully used for switching analog signals in test systems especially where frequent switching is required and are particularly suited for isolated switching of medium currents AC or DC in power distribution systems since lifetime of electromechanical contacts is reduced when switched current approaches their rated current Solid
5. 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 3 5 8 UPDATE FC_ADR 8H VX _ADR 20H This register is used in Synchronous Update mode Write to this register written data doesn t matter updates state of all relays simultaneously To achieve that board must be properly configured Synchronous Update mode must be selected bit SYNCUPDT in FCCSR register set to T write to UPDATE register must be selected as a source of update signal bit SYNCSRC in FCCSR register set to 0 In opposite to synchronous update with software trigger every write to UPDATE register generates event updating relays there is no need to write zeros and ones alternately to generate series of updates BR 15 14 18 12 es tof oe e 7 6 5 4 es fee Ron X X X X X X X X X X X X X X Initial x D Content UPDATE register 3 5 9 RELG1 FC_ADR 9H VXI_ADR 24H This register controls state of relays in group 1 channels 1 8 Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Operation RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW Initial 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Content RLAx These bits control state of relay A in channel x Write 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current Read Gives actual state of the relay not the last written value 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current USAG
6. 40 XX UM ProDAQ 3940 Relay Function Card User Manual BR 15 14 13 12 WEE 7 6 5 4 EEN operation RO TT Initial 0 Content Not used OTRIG_LEVELIe Wei Wei CG oc O OTRIG_EN OTRIG_EN This bit is the output trigger enable bit If this bit is cleared no output trigger will be sent to MB If this bit is set output trigger to MB will be generated if trigger source becomes active Write 0 output trigger disabled 1 output trigger enabled Read Gives the last written value USAGE e Output trigger enabling bit OTRIG_LEVEL This bitis for selection of the output trigger generating mode Pulse after a rising edge of a trigger source pulse of 125 ns width will be generated independently of trigger source high level duration Level after a rising edge a trigger source output trigger level will follow the level of trigger source Write 0 output trigger generating mode set to pulse 1 output trigger generating mode set to level Read Gives the last written value USAGE e When working with interrupts to the host the level mode should be set OTRIG_STS The state of the output trigger line Write No effect Read 0 output trigger inactive 1 output trigger active USAGE e When working with interrupts to the host this bit should be used by the interrupt routing to determine the interrupt source Page 14 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User M
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8. E eState of corresponding relays is updated immediately if board is not switched to Synchronous Update mode eln Synchronous Update mode the state of relays stays unchanged until required conditions event are met As an event updating all relays at a time either write to UPDATE register or input trigger can be selected Copyright 2002 Bustec Production Ltd Page 17 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual elnformation written to RELG1 register and read back may differ when board is in Synchronous Update mode and after write to this register no update event took place RLBx These bits control state of relay B in channel x Write 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current Read Gives actual state of the relay not the last written value 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current USAGE eState of corresponding relays is updated immediately if board is not switched to Synchronous Update mode eln Synchronous Update mode the state of relays stays unchanged until required conditions event are met As an event updating all relays at a time either write to UPDATE register or input trigger can be selected elnformation written to RELG1 register and read back may differ when board is in Synchronous Update mode and after write to this register no update event took place 3 5 10 RELG2 FC_ADR AH VX ADR 28H This register controls state of relays in gr
9. E 25 5 TECHNICAL SPEGIFICA BION EE 27 6 FRONT PANEL CONNECTOR AND SIGNAL ASSIGNMENTS ne 29 Copyright 2002 Bustec Production Ltd Page 3 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual Glossary FC Function Card FIFO First In First Out Memory EEPROM Electrically Erasable Programmable Read Only Memory MB Motherboard PCB Printed Circuit Board PTC Positive Temperature Coefficient RO Read Only ROC Read Only cleared after readout RW Read Write SSR Solid State Relay WO Write Only VXI VME eXtensions for Instrumentation Reference Documents Title ProDAQ 3120 Standard Motherboard Module User Manual 3120 XX UM xxxx RE ie a CET Page 4 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 1 Introduction The ProDAQ 3940 relay function card is an add on card to use together with the ProDAQ Standard Motherboard 3120 or High Performance Motherboard 3150 The 3940 function card is a switching card with 32 independently controlled 1 Form A relays Two relays occupy 3 terminals on the function card front panel connector This means that they share one common terminal as it is shown on the Figure 1 Every two relays sharing three pins on the front panel connector are considered as one channel of the 3940 relay function card This means that the card has 16 independent channels Overvoltage protection option
10. USER MANUAL ProDAQ Data Acquisition Function Cards ProDAQ 3940 32 Channel Relay Switching Function Card Ge te P ti LIEF EL LS S de e Be ogag PUBLICATION NUMBER 3940 XX UM 0010 bustec Copyright 2014 Bustec Production Ltd Bustec Production Ltd Bustec House Shannon Business Park Shannon Co Clare Ireland Tel 353 0 61 707100 FAX 353 0 61 707106 PROPRIETARY NOTICE This document and the technical data herein disclosed are proprietary to Bustec Production Ltd and shall not without express written permission of Bustec Production Ltd be used in whole or in part to solicit quotations from a competitive source or used for manufacture by anyone other than Bustec Production Ltd The information herein has been developed at private expense and may only be used for operation and maintenance reference purposes or for purposes of engineering evaluation and incorporation into technical specifications and other documents which specify procurement of products from Bustec Production Ltd This document is subject to change without further notification Bustec Production Ltd reserves the right to change both the hardware and software described herein ProDAQ 3940 Relay Function Card User Manual 3940 XX UM Table of Contents GLOSSARY EE 4 REFERENCE DOCUMENTS viissisiscsisccesdeicccsscaidsvascedeccescuadsdsscsdeccescusdsvesssduecesevasvesasiaavesceitens 4 Te INTRODUCTION sacre nantes nengenase
11. XX UM 5 Technical Specification ITEM SPECIFICATION Number of Relays 32 16 independent channels AA Relay Type Ruthenium plated Reed Relays On path Resistance lt 0 3 Q initial Switch Current 0 5 A max Carry Current 1 0 A max per common terminal Switch Voltage 24 V max Switch Power Rating 10 W max Insulation Resistance gt 10170 Turn On Time lt 0 5 msec Turn Off Time lt 0 25 msec Expected Relay lifetime 10 operations Current Consumption 300 mA 5V AB Relay Type Ruthenium plated Reed Relays Overcurrent Protection PTC Resettable Fuse Overvoltage Protection Multilayer Transient Voltage Surge Supressor Leakage Current 10nA On path Resistance lt 0 6 Q initial Switch Current 0 5 A max Carry Current 0 5 A max Switch Voltage 24 V max Switch Power Rating 10 W max Insulation Resistance gt 10120 Turn On Time lt 0 5 msec Turn Off Time lt 0 25 msec Expected Relay lifetime 10 operations Current Consumption 300 mA 5V BA Relay Type Solid State Relays On path Resistance lt 0 7Q Off path Resistance gt 105Q Switch Current 0 9 max Carry Current 0 9 max Switch Voltage 24 V max Insulation Resistance gt 102Q Turn On Time lt 2 0 msec Turn Off Time lt 0 5 msec Expected Relay lifetime Unlimited Current Consumption 500
12. anual 3940 XX UM 3 5 6 ITRI FC_ADR 6H VX _ADR 18H The register allows selection of the trigger source which will be used to update state of all relays simultaneously in Synchronous Update mode and or will be sent as an output trigger to MB These are the three possible input trigger sources trigger through the Front Panel connector FPITRIG trigger from the switch matrix on the MB software trigger To be able to use input trigger to update state of all relays simultaneously board must be properly configured Synchronous Update mode must be selected bit SYNCUPDT in FCCSR register set to 1 Input trigger register must be selected as a source of update signal bit SYNCSRC in FCCSR register set to 1 BR is 14 13 12 N Ir 5 4 a a Operation RO ROC Spee A EA Initial Content CH CH TRIGCOME SW2ITRIG MB2ITRIG_EN FP2ITRIG_EN FPITRIG_ ALOW e o He gei SG e FPITRIG_ This bit sets the active level of the external trigger coming from the ALOW Front Panel ALOW stands for Active LOW Write 0 active level high 1 active level low Read Gives the last written value FP2ITRIG_EN This bit enables the external trigger through the Front Panel connector FPITRIG as a source of input trigger Write 0 external trigger disabled 1 external trigger enabled Read Gives the last written value USAGE e The active level of external trigger can be set using FPITRIG_ALOW bit C
13. cess are easily determined If a warning occurs a value greater than VI_SUCCESS is returned The same function bu3940_error_message can be used to convert the warning code into readable string 4 3 3 Connecting to the instrument A typical initialization sequence is as following bu3940 init VXI 1 INSTR V _ TRUE V _ TRUE amp viSession bu3940 fcSelect viSession 2 use function card in pos 2 The call of function bu3940 fcSelect is obligatory and has to be issued after bu3940 init function but before calling any other bu3940 function Although for convenience another function is provided which encompasses the functionality of those two function calls bu3940 paramInit VXI 1 INSTR 2 VI TRUE VI TRUE amp viSession There is a strong requirement that function bu3940 close should be called when the instrument is no longer used Each ProDAQ driver obtains a lock to the motherboard resource which is released by bu3940 close function afterwards This also means that it is not possible to access two function cards either the same or different located on the same motherboard from two separate system processes since they would use the same resource descriptor but different instances of common library DLL Therefore the unmatched bu3940 close call can lock the resource as long as common interface library is loaded Page 24 of 32 Co
14. ct 1 Resets all relays and configuration bits in FCCSR ITRI and OTRI registers to their initial state Read Always gives 0 SYNCSRC This bit selects the source of a synchronous update signal Write 0 write to UPDATE register updates state of all relays 1 input trigger updates state of all relays Read Gives the last written value USAGE eSynchronous Update must be selected with SYNCUPDT bit elf input trigger signal is used to update relays one of the input trigger sources must be enabled in ITRI register SYNCUPDT This bit switches board to Synchronous Update mode in which all relays can be updated synchronously Write 0 Synchronous Update mode is OFF 1 Synchronous Update mode is ON Read Gives the last written value 3 5 4 FCLEN FC_ADR 3H VX _ADR CH This is register containing information about size of installed FIFO Readout should always give OOOOH because no FIFO is used on this card eee E E E EE E pe Operation RO RO Initial Size of installed FIFO 0000F 3 5 5 OTRI FC_ADR 5H VXI_ADR 14H Output trigger register allows to control whether the output trigger will be sent to the MB and whether output trigger will be generated as a level or pulse There is only one output trigger source input trigger signal generated internally The output trigger can be used to generate an interrupt to the host computer after input trigger arrived Copyright 2002 Bustec Production Ltd Page 13 of 32 39
15. ding to the selected synchronisation mechanism While working in synchronous mode the Synchronized LED control signals the relay update state a green colour means that the state is up to date read colour means that the relays state has changed in registers but it awaits update command or trigger in order to be switched When the LED is green the buttons state on the main panel reflects the relays state Page 22 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 4 3 Programming Concepts 4 3 1 Instrument Driver Overview To use the instrument driver for the Relay Function Card one ProDAQ Motherboard e g the 3120 or 3150 has to be used In new 2 x version of drivers a common interface library was implemented to act as an intermediate layer between the motherboard hardware and the driver handling the communication to the different motherboards in a transparent way In turn now every function card driver acts as a standalone VXlplug amp play compatible driver using its own instrument handle to communicate to the instrument There is no longer the need to have a driver for the motherboard installed although this is recommended The common library is included to the installation package for every ProDAQ VXIplug amp play driver The Instrument driver for the ProDAQ 3940 provides the following functionality Frog S948 kedap Function Card Initialization Select Function Ca
16. en packing unpacking or installing any function card Failure to do so may cause damage to the unit 2 2 2 3 Reshipment Instructions Use the original packing material when returning the function card to Bustec Production for calibration or servicing The original shipping carton and the instrument s plastic foam will provide the necessary support for safe reshipment If the original packing material is unavailable wrap the switching module in plastic sheeting and use plastic spray foam to surround and protect the instrument Reship in either the original or a new shipping carton Installation The Function Card is placed into the slot with the SCSI connector facing the front of the module Then the extraction tool is used to align the back edge of the card with the pins on the motherboard and the Function Card is gently pressed down onto the pins There are two screws and two washers that go through the front panel and lock the front of the Function Card Additionally there are three other screws and two washers per screw that go on the top of the card and lock it down Page 6 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 3 Theory of operation 3 1 Relay types and protection 3 1 1 Board versions As it was mentioned in chapter 1 two types of relays can be installed on the board These are reed relays and solid state relays Choice of a particular relay type d
17. epends on the application where the board will be used Their properties are shortly described in the following chapters Additionally overcurrent and overvoltage protection of relays can be installed Since not always protection is desirable because it increases signal path resistance overcurrent protection and leakage current overvoltage protection various combinations of used relays and installed protection lead to different board version Four combinations given in the Table 1 are standard versions of 3940 Relay Function Card Contact Bustec for availability of other combinations of relay protection No Version _ Relay type Overcurrent protection Overvoltage protection 3940 AA Reed 3940 AB Reed 3940 BA Solid state 3940 BB Solid state Table 1 Standard 3940 relay card versions 3 1 2 Reed relays Pickering 109P series miniature 1 Form A energise to make high performance ruthenium electro plated reed relays are used They are hermetically sealed and offer a very stable long life relay contact 108 operations typically 10 operations with very fast ON and OFF times A ruthenium contact exhibits less wear and virtually no tendency to cold weld or stick Their ability of switching low level signals or cold switching makes them ideal for ATE applications where such techniques are often used Mu metal magnetic screening eliminates problem of magnetic interaction and allows for dense packing
18. h takes approximately 10ms after power up or deasserting reset signal from motherboard Initial Content mz 16 bit of ET See Page 20 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 4 Software Utilities 4 1 Introduction The ProDAQ 3940 VXIlplug amp play compatible driver package encompasses the instrument driver soft front panel documentation and examples The VX p ug amp play soft front panel is a graphical user interface application developed for the instrument It is used to verify the instrument operation and functionality when the instrument is first integrated into a system It provides instrument control in a user friendly environment being both Windows 95 and NT framework compatible The soft front panel application uses the installed driver to control and operate the instrument 4 2 Soft Front Panel After the start of the Soft Front Panel application the user will be presented with a dialog box showing all available ProDAQ 3940 instruments in a system allowing the selection of one instrument which will be operated Due to imposed limitations there is no possibility to control simultaneously two or more instruments fitted to the same motherboard If there is only one instrument available this dialog box will not appear and this instrument will be automatically selected for operation In order to run the soft front panel for the chosen 3940 select the app
19. han one source can be selected at a time The input trigger configuration is shown on the Figure 3 Copyright 2002 Bustec Production Ltd Page 9 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual FPITRIG WEE FPITRIG_ALOW FP2ITRIG_EN FROM SWITCH MATRIX ON MB ITRIG_STS MB2ITRIG_EN INPUT TRIGGER SW2ITRIG Figure 3 The input trigger configuration Note that the state of the relays is updated only when input trigger becomes active card must be earlier configured to work in Synchronous Update mode There are two consequences of such behaviour when one of the input trigger sources is already active no event updating relays is generated if another input trigger source becomes active to generate series of events updating relays with software trigger software has to write to SW2ITRIG bit zeros and ones alternately 3 3 2 Output trigger The output trigger is located on the MB FC connector and it goes to the MB switch matrix Then it can be directed to any trigger line connected to the switch matrix There is only one output trigger source input trigger signal generated internally The output trigger system can generate the pulse or the level If the level has been selected the output trigger stays active as long as the source of the trigger is active If the pulse is selected pulse of 125 ns width is generated when output trigger source signal becomes active The output t
20. hanged until required conditions event are met As an event updating all relays at a time either write to UPDATE register or input trigger can be selected elnformation written to RELG2 register and read back may differ when board is in Synchronous Update mode and after write to this register no update event took place 3 5 11 FCSUB FC_ADR FCH VXI ADR 3F0H This is function card sub type register useful for software to distinct between versions of the board This register is automatically loaded during board initialisation with contents of on board EEPROM chip which takes approximately 10ms after power up or deasserting reset signal from motherboard Initial Content Second Teiter ASC Function card sub type e g AAT 3 5 12 FCSERH FC_ADR FEH VX I_ADR 3F8H This register contains the upper 16 bit of the serial number of the function card This register is automatically loaded during board initialisation with contents of on board EEPROM chip which takes approximately 10ms after power up or deasserting reset signal from motherboard Initial Content TE 16 E of SSC SR Copyright 2002 Bustec Production Ltd Page 19 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual 3 5 13 FCSERL FC_ADR FFH VXi_ADR 3FCH This register contains the lower 16 bit of the serial number of the function card This register is automatically loaded during board initialisation with contents of on board EEPROM chip whic
21. ltilayer surge supressors can be installed on the board When SSRs are used any voltage that exceeds the SSR s maximum peak voltage can potentially damage the relay Again this may happen when relays are used to control inductive loads In this case outputs of SSR require an overvoltage suppression device like multilayer Surge supressors 3 2 Relays control and synchronous update For the purpose of relay control two 16 bit registers RELG1 group 1 channels 1 8 and RELG2 group 2 channels 9 16 are available in the board s address space Each bit in these registers directly controls state of one relay Write to one of those registers immediately updates relays state For applications where simultaneous switching of relays in different groups is required Synchronous Update mode can be used When the board is configured to work in this mode software also writes to registers RELG1 and RELG2 but the state of relays stays unchanged until required conditions event are met As an event updating all relays at a time write to special UPDATE register or input trigger can be selected For more detailed description of board registers refer to chapter 3 4 3 3 Trigger system 3 3 1 Input trigger Input trigger is used to update both relay groups synchronously There are possible three input trigger sources trigger through the Front Panel connector FPITRIG trigger from the switch matrix on the MB and software trigger SW2ITRIG More t
22. mA 5V BB Relay Type Solid State Relays Overcurrent Protection PTC Resettable Fuse Overvoltage Protection Multilayer Transient Voltage Surge Supressor Leakage Current 10nA On path Resistance lt 10Q Switch Current 0 5 max Carry Current 0 5 max Switch Voltage 24 V max Insulation Resistance gt 102Q Turn On Time lt 2 0 msec Turn Off Time lt 0 5 msec Expected Relay lifetime Unlimited Current Consumption 500 mA 5V Copyright 2002 Bustec Production Ltd Page 27 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual ITEM SPECIFICATION Overcurrent protection characteristics Type Hold current Trip current Time to trip Maximum voltage Reset time Resistance Dissipated power Ressetable PTC fuse 0 75 A 25 C 0 61 A 50 C 1 5 0 3 s max 8 0 A 24V lt 120s 0 29 Q max 0 6W Overvoltage protection characteristics Type Non repetitive surge current 8 20 us Non repetitive surge energy 10 1000 ps Leakage current Response time Typical capacitance Multilayer transient voltage surge supressor 30A max 0 1 J 10 pA max lt 5 0 ns 75 pF Trigger Input Maximum input voltage Input type Negative threshold Positive threshold Histeresis Active Polarity 5V Schmitt trigger 1 5 V typ 2 5 V typ 1 0V typ Software selectable Connectors 50 pin SCSI female Dime
23. n qe neo teen ennntue menant aaaea av q anni enneres canne tante 5 2 INSTALLATIONS sn tint ais aera aea bis tone a ee 6 2 1 UNPACKING ERNEIEREN ERC 6 2 2 RESHIPMENT INSTRUCTIONS ssessssrresseeeeeeeennnnnnneseeeeeeeeenennnnneseseeeeeeeeennnnnnneeees 6 Sech INSTALLATION RE en edna un een a eer 6 3 THEORY OF OPERATIONS ennnen 7 3 1 RELAY TYPES AND PROTECTIONS sant near a pa aar RENE 7 3 1 1 Board ee 7 3 1 2 WHOCO E 7 SE Photovoltaic TelayS a ne eee den tenue ce noi ma 7 3 1 4 EE EIERE 8 3 1 5 Overvoltage protection sass oe Sis NAS Ste sn ad 9 3 2 RELAYS CONTROL AND SYNCHRONOUS UPDATE 9 3 9 TRIGGER SYSTEM RE E 9 Neel EE 9 Bide ee ee 10 34 1REGISTER DESCRIPTION ah aa a nd ENEE E 11 3 4 1 Address Eeer 11 3 57 REGISTER DETAI Smin a a a E aaa 12 3 5 1 RE D ised E fabs ici ceca E T E E E A EEE E 12 Oe EE 12 393 SE OCS EN 12 3 5 4 IE EE 13 Ss o e EE 13 CT EE 15 eRT A E EE 16 ERS G EE 17 e E WE ce EE 17 SRT OEE 51 E cts Rts eS ihr es a ih es aii abi tha 18 OAD COUP EE EE 19 DOTE SPO SERGE EEN 19 PIO TEC O EA ee 20 4 SOFTWARE HUE EE 21 4 1 INTRODUCTION EE EE E EE EEN 21 427 SOFT FRONT PAINE EE 21 4 3 PROGRAMMING CONCEPTS 0scccccccesseececcessecccecessecececenscececeenseceeeeaeseceeeseaseeeeeeeees 23 4 3 1 instrument Driver Overview REENEN 23 4 3 2 Error Status Information EE 23 4 3 3 Connecting to the instruMent ssrstsetistpmsntiseebrisresdeneehreteetes 24 e DEE 25 43 5 Programming e E
24. nel connector 25 e ej 50 Figure 8 Front panel SCSI connector front view when 3940 relay card is fitted on ProDAQ module in VXI chassis Copyright 2002 Bustec Production Ltd Page 29 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual To simplify connection of field wiring to 3940 relay function card together with a SCSI cable we recommend using Signal Conditioning Unit 5010 AA with Terminal Block Card 5421 AA To determine which terminal block connects to a particular channel of 3940 function card use the following table Terminal Terminal 3940 SCSI Block no Block pin signal Pin FPITRIG DGND 16 B 16 COM 16 A 15 B 15 COM 15 A 14 B 14 COM 14 A 13 B 13 COM 13 A 12 B 12 COM 12 A 11 B SCSI 3940 Terminal Terminal Pin signal Block pin Block no 11 COM 11 A 10 B 10 COM 10 A 9 B 9 COM 9 A Page 30 of 32 Copyright 2002 Bustec Production Ltd Bustec Production Ltd World Aviation Park Shannon Co Clare Ireland Tel 353 0 61 707100 FAX 353 0 61 707106 Bustec Inc 35
25. nsions 230 x 52 6 mm PCB construction 6 layer PCB Weight lt 100g Operating temperature 0 C to 50 C Storage temperature NOTES 40 C to 70 C If both relays in particular channel are open current in common path must not exceed 1A Actual maximum current is limited by PTC fuse to its hold current value if it is installed 2 The life of the relay depends entirely upon load condition 3 Dissipated power is useful for calculating whether automatic reset condition for PTC fuse is met The device will automatically reset when v lt Pp 4R where V operating voltage of the circuit R Load resistance Pp dissipated power Page 28 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 6 Front Panel Connector and Signal Assignments A high density 50 pin female SCSI type Harting 60010505132 connector is used Bustec offers matching cable assemblies product number 8010 AA 0 5 Meter SCSI Connector Cable and 8010 AB 1 Meter SCSI Connector Cable As it was shown on Figure 1 every channel of 3940 FC has three terminals one common terminal x COM and terminals connecting to relay A x A and relay B x B x stands for the channel number Layout of those terminals on the Front Panel connector is given on Figure 8 Additionally also input trigger FPITRIG and ground DGND terminals are available on the front pa
26. oint 1 Point 2 Point 3 Temperature C Figure 2 Example of operating curve for PTC fuse not to scale Page 8 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 3 1 5 Overvoltage protection While opening relays short duration increases in system voltage due to emptying of a circuit energy storage element such as an inductor may appear These overvoltage transients may have significant impact on lifetime of both reed relays and solid state relays When electromechanical relays including reed relays are used to control inductive loads it is often necessary to derate the contacts to 50 of their resistive load rating due to the wear caused by the arcing of the contacts This arcing is caused by the stored energy in the inductive load Each time the current in the inductive coil is interrupted by the mechanical contacts the voltage across the contacts increases until the contacts arc When the contacts arc the voltage across the arc decreases and the current in the coil can increase somewhat The extinguishing of the arc causes an additional voltage transient which can again cause the contacts to arc It is not unusual for restriking to occur several times with the total energy in the arc several times that which was originally stored in the inductive load It is this repetitive arcing that is so destructive to the contacts To prevent initiation of the arc optional mu
27. opyright 2002 Bustec Production Ltd Page 15 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual MB2ITRIG_EN This bit enables the MB trigger as a source of input trigger Write 0 MB trigger disabled 1 MB trigger enabled Read Gives the last written value SW2ITRIG This bit sets the software generated input trigger Write 0 inactive state of the software generated input trigger 1 active state of the software generated input trigger Read Gives the status of software generated input trigger USAGE e To generate series of events updating relays with software trigger software has to write to SW2ITRIG bit zeros and ones alternately TRIGCOME This bit gives information if input triggers arrived since last readout of ITRI register Write Has no effect Read 1 Trigger arrived after last readout of ITRI register 0 No trigger arrived after last readout of ITRI register USAGE e To check whether trigger arrived without using interrupts e Readout from ITRI register clears TRIGCOME bit ITRIG_STS Current state of the input trigger The status shows OR function of all enabled sources of input trigger Write Has no effect Read 0 input trigger inactive 1 input trigger active 3 5 7 TEST FC_ADR 7H VXi_ADR 1CH Test register is Read Write register dedicated to be used during production test 15 14 13 12 11 10 Staten aw Rw 2 Rw Rw RW AW aw a aw a aw e en content Read de fest ee Page 16 of 32 Copyright
28. oup 2 channels 9 16 15 14 13 12 11 10 Operation RW RW RW RW a RW AW AW a aw AW a sa Wi RLAx These bits control state of relay A in channel x Write 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current Read Gives actual state of the relay not the last written value 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current USAGE eState of corresponding relays is updated immediately if board is not switched to Synchronous Update mode eln Synchronous Update mode the state of relays stays unchanged until required conditions event are met As an event updating all relays at a time either write to UPDATE register or input trigger can be selected elnformation written to RELG2 register and read back may differ when board is in Synchronous Update mode and after write to this Page 18 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM register no update event took place RLBx These bits control state of relay B in channel x Write 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current Read Gives actual state of the relay not the last written value 0 Relay is OFF doesn t conduct current 1 Relay is ON conducts current USAGE eState of corresponding relays is updated immediately if board is not switched to Synchronous Update mode eln Synchronous Update mode the state of relays stays unc
29. pyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 4 3 4 API Layout API functions are logically divided into groups which provide different functionality Apart from functions which establish session with the instrument and utility functions defined by VISA standard there are control and configuration groups which provide actual functionality The Output Control class contains functions which operate on relays both in asynchronous and synchronous mode The Configure Functions class contains functions to configure 4 3 5 Programming instrument Next few paragraphs discuss step by step instrument setup to operate relays in asynchronous or synchronous mode All functions are fully described in the driver help file After initialization process the instrument is in asynchronous mode and can be operated using bu3940_switchRelay or bu38940_switchABPair functions bu3940 switchRelay viSession 3 VI TRUE bu3940 switchABPair viSession 2 bu3940 A ON The two function calls in the code snippet above simply switch the relay third on The second call additionally switches fourth relay off as it operates on pair of relays Following sample shows instrument operation in synchronous mode using software command to release relays state change ViBoolean relaysSet 32 0 Vilnt32 i JET bu3940 setSwitchingMode viSession bu394 ITCH _ SYN CMD bu394 RIG NONE
30. rd Initialization With Parameters Output Control FUNCIONS Switch Relay Switch AB Pair Get Relay State Update Relays State Pulse Synch Trigger Get Trigger Status Lenfiqure FUNCIONS Set Switching Rode Get Switching Mode Enable Output Trigger FEI II Ep FUNCIONS Reset Error Query Error Message Self Test Revision Query Close Figure 7 Instrument Driver function tree A full description of the instrument driver functions can be found in the driver help file 4 3 2 Error Status Information Every instrument driver function has the same return type format Returning either a completion code or an error code ViStatus VI FUNC bu3940 functionName Parameters In order to identify the successful operation of any function these codes can be used The following example illustrates this principle Copyright 2002 Bustec Production Ltd Page 23 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual ViSession vi ViStatus error ViChar msg 512 error bu3940 reset vi if error lt VI_SUCCESS bu3940 error message vi error msg stop execution else if error gt VI SUCCESS bu3940 error message vi error msg print a warning and continue execution If an error occurs a value less than VI SUCCESS is returned The function bu3940 error message converts the error code into a readable string All driver functions operate along the same principles so any errors in hardware ac
31. rigger configuration scheme is shown on the Figure 4 OTRIG_STS INPUT TRIGGER PULSE GENERATOR 0 NJ 1 TRIGGER A OTRIG_EN TO MB OTRIG_LEVEL Figure 4 The output trigger configuration Output trigger is especially useful when input trigger through the Front Panel connector FPITRIG is used in the system It can inform the host for example through interrupt that input trigger arrived and an action like write new values to relay configuration registers RELG1 and or RELG2 must be taken Page 10 of 32 Copyright 2002 Bustec Production Ltd ProDAQ 3940 Relay Function Card User Manual 3940 XX UM 3 4 Register description 3 4 1 Address map and registers All addresses are given in hexadecimal notation FC_ADR is address in FC address space VXI_ADR is address in VXI address space The appropriate address offset depends on the function card position on the motherboard refer to the motherboard manual EC VXL_ Register Name ADR ADR FPGA internal registers oO o FCID RO FC ID register 1 4 FCVER RO FC version register 2 8 FCCSR RW Function card Control and Status Register 3 C FCLEN RO Size of installed FIFO 4 10 ET E Output trigger control register 6 18 ITRI RW Input trigger control register Test register 8 20 UPDATE up Update register 9 24 RELGI RW Relay group 1 control register FC 3F0 FCSUB RO Function Card sub type register
32. ropriate position from the list and press OK button ProDAQ 3940 SFP Select Function Card zi LLEIS Vd G Slot 1 3120 Slot 3 3120 Ece 540 ECH 3940 H Slot 6 3120 Cancel Figure 5 Function Card selection This will invoke the main Soft Front Panel window as shown in Figure 6 Copyright 2002 Bustec Production Ltd Page 21 of 32 3940 XX UM ProDAQ 3940 Relay Function Card User Manual LLES bustec ProDAQ 3940 Soft Front Panel ProDAQ 3940 Relay Function Card Pair 1 A B Ke Pair 2 A Ae B A Pair 3 A er B Ke Pair 5 Pair 6 Pair 7 Pair 8 A ao To A o A To B oo B o B oo B oo Pair 9 Pair 10 Pair 11 Pair 12 kg ele feet amp Leet amp lel Been Beef e BA Pair 13 Pair 14 Pair 15 A Ke NES BS Bee E EA m Switching Mode Control Eme Command RA Trigger Update Synchronized Exclusive Figure 6 Main panel The main panel of the soft front panel shows the relays grouped in pairs as they are arranged on the function card The relays within the pairs can be operated separately or when exclusive mode is selected in dependence of the state of the other relay in the pair The soft front panel allows selecting an update mode as asynchronous or synchronous In latter case the Trigger or Update buttons are activated accor
33. state relays ensure bounce free operation high off state resistance and linear AC DC operation and are UL recognized and CSA certified 3 1 4 Overcurrent protection An overcurrent is an abnormally high current that has the potential to cause failure in an electrical circuit An out of range condition in the power source or a decrease in load impedance can cause an overcurrent Used PTC fuses ensures protection of both card relays and external circuitry from damage They protect circuitry by going from a low resistance state to a high resistance state in response to an overcurrent which is called tripping the device This way the current in the circuit is reduced to the value which can be safely carried by any of the circuit elements The change of resistance is the result of a rapid increase in the temperature of the device caused by the generation of heat within the fuse by I R heating A vary narrow temperature range is sufficient for PTC fuse for a sharp change in its resistance which is graphically shown on Figure 2 After a faulty condition is removed PTC fuse automatically returns to low resistance state within a few dozen of seconds so device can be still used without costly service intervention Usage of overcurrent protection is recommended in power distribution systems where probability of shortcuts and overloads is significant Used PTC fuses have recognition of UL CSA and TUV agencies Point 4 Log resistance Q P
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