Switches
PXI-7931
4x8 2-Wire Matrix Module
Introduction
ADLINKs PXI-7931 is a matrix module with 32 cross-point 2-wire relays (DPDT, 2 Form C). The default
configuration of the PXI-7931 is a 4-group 2x4 2-wire matrix. With the terminal board, TB-6231-01,
users could flexibly choose one of the configurations: one 4x8, two 4x4, one 2x16, two 2x8 and four 2x4. Any
contact of the PXI-7931 can connect to other contacts, individually or in combination. The PXI-7931 matrix
module simplifies the wiring and makes it easy to change the internal connection path.
The contact position of the relays can be changed either by direct software commands or by following the
instructions previously stored in the onboard scan list. The scan list advances upon the trigger from external
measurement devices, such as a DMM. The scan list could also advance when the scan-delay timer expires.
In the PXI-7931 the PXI trigger functions are supported and software programmable. Multiple modules can
therefore be synchronized without additional field wiring.
Specifications Ordering Information
Source Wire Multiplexer
PXI-7931
One 4x8, Two 4x4, One 4x8 2-Wire Matrix Module
2-wire
2x16, Two 2x8, Four 2x4
* Failure rate indicates the lower limit of switching
capacity of a relay contact at a reliability level of 60%
Relay Characteristics
Features
Number of cross points: 32 (2-wire)
PXI specifications Rev. 2.2 compliant
Relay type: DPDT (2 Form C), non-latching
Pin Assignment
3U Eurocard form factor, CompactPCI
Switching capacity
compliant (PICMG 2.0 R3.0)
Max. switching current: 2 A
2x4x4 configuration
PICMG 2.1 R2.0 CompactPCI Hot Swap Max. switching voltage: 220 VDC, 125 VAC
Max. switching power: 60 W
specifications compliant 22. C8+
Max. carrying current: 2 A
Configuration determined by terminal board
43. C0+ 23. C8- 1. R0+
Contact resistance: 100 m max.
Up to 32 cross-point DPDT (2 Form C) non-latching relays
44. C0- 24. C9+ 2. R0-
Relay set/reset time
Contact rating
Operate time: 4 ms max.
45. C1+ 25. C9- 3. R1+
2 A switching, 2 A carrying
Release time: 4 ms max.
46. C1- 26. C10+ 4. R1-
220 VDC, 125 VAC Expected life
47. C2+ 27. C10- 5. R2+
8
Mechanical life: 10 operations min.
Onboard 1 k-sample scan list for deterministic scanning
5
48. C2- 28. C11+ 6. R2-
Electrical life : 5x10 operations min.
Handshaking signals for external instruments
(1 A @ 30 VDC, resistive load)
49. C3+ 29. C11- 7. R3+
synchronization
Data transfer: programmed I/O
50. C3- 30. C12+ 8. R3-
Design for safety-critical applications
Auxiliary Digital I/O
Hardware emergency shutdown with programmable relay 51. C4+ 31. C12- 9. R4+
Numbers of channel: 8 inputs/outputs
safety status
52. C4- 32. C13+ 10. R4-
Compatibility: 3.3 V/TTL (5 V tolerant)
Watchdog timer from 1 ms to 420 s with programmable
53. C5+ 33. C13- 11. R5+
Handshaking Signals
relay safety status
54. C5- 34. C14+ 12. R5-
8 auxiliary 3.3 V/TTL digital inputs/outputs with Programmable polarity
55. C6+ 35. C14- 13. R6+
Logic level: 3.3 V/TTL (5 V tolerant)
5 V tolerance
56. C6- 36. C15+ 14. R6-
TRG_IN source: AUX1, PXI trigger bus, PXI star
Multiple modules synchronization through
trigger input
57. C7+ 37. C15- 15. R7+
PXI trigger bus and star trigger
S_ADV destination: AUX0, PXI trigger bus,
58. C7- 38. N/C 16. R7-
Versatile matrix configuration with terminal board
PXI star trigger outputs (star trigger slot)
59. N/C 39. N/C 17. N/C
Fully software programmable
Safety Functions
60. AUX3 40. AUX4 18. AUX2/SHDNn
Operating Systems
Emergency shutdown
61. AUX6 41. +5Vout 19. AUX5
Logic level: 3.3 V/TTL (5 V tolerant)
Windows Vista/XP/2000/2003
62. AUX7 42. AUX1/TRG_IN 20. GND
Active: logic low
Recommended Software
Watchdog timer
21. AUX0/S_ADV
Base clock available: 10 MHz, fixed
VB/VC++/BCB/Delphi
Counter width: 32-bit
DAQBench
General Specifications
Driver Support Terminal Boards & Cables
I/O Connector: 62-pin D-sub male
ADL-SWITCH for Windows Operating temperature: 0C to 55C
TB-6231-01
Storage temperature: -20C to 70C
Multiplexer Switch Terminal Board with One
Relative humidity: 5% to 85% non-condensing
62-Pin D-Sub Female Connector
Power requirements: (when all relays are ON)
ACL-10262
Device +5 V +3.3 V
PXI-7931 1 A 400 mA
62-pin D-sub male/female cable, 1 M
(For more information about mating cables,
Dimensions
please refer to P4-28.)
160 mm x 100 mm (not including connectors)
Certifications
EMC/EMI: CE, FCC Class A
4-20
Updated 03-28, 2012. 2012 ADLINK Technology, Inc. All Rights Reserved. All specifications are subject to change without further notice. Updated 03-28, 2012. 2012 ADLINK Technology, Inc. All Rights Reserved. All specifications are subject to change without further notice. www.adlinktech.com