![Green circuit board with multiple integrated circuits and connectors, no visible text or symbols](.pxi-7931-datasheet-20191223/7321ca1d49234477fc42097516ae25c7ed2cf0ddfadb86ba15dd5d9120a90ee6.jpg) # Features ■ PXI specifications Rev. 2.2 compliant 3U Eurocard form factor, CompactPCI compliant (PICMG 2.0 R3.0) PICMG 2.1 R2.0 CompactPCI Hot Swap specifications compliant ■ Configuration determined by terminal board ■ Up to 32 cross-point DPDT (2 Form C) non-latching relays Contact rating \- 2 A switching, 2 A carrying \- 220 VDC, 125 VAC Onboard I k-sample scan list for deterministic scanning ■ Handshaking signals for external instruments synchronization ■ Design for safety-critical applications Hardware emergency shutdown with programmable relay safety status - Watchdog timer from 1 ms to 420 s with programmable relay safety status 8 auxiliary 3.3 V/TTL digital inputs/outputs with 5 V tolerance ■ Multiple modules synchronization through ■ PXI trigger bus and star trigger ■ Versatile matrix configuration with terminal board ■ Fully software programmable Operating Systems \- Windows 7/10 x64/x86 Driver and SDK - VB/VC++ - LabVIEW # Introduction ADLINK's 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
Source WireMultiplexer
2-wireOne 4x8, Two 4x4, One 2x16, Two 2x8, Four 2x4
# Relay Characteristics ■ Number of cross points: 32 (2-wire) ■ Relay type: DPDT (2 Form C), non-latching ■ Switching capacity · Max. switching current: 2 A · Max. switching voltage: 220 VDC, 125 VAC · Max. switching power: 60 W · Max. carrying current: 2 A ■ Contact resistance: 100 mΩ max. Relay set/reset time · Operate time: 4 ms max. \- Release time: 4 ms max. Expected life · Mechanical life: $10^{8}$ operations min. · Electrical life : 5x10 $^{5}$ operations min. (1 A @ 30 VDC, resistive load) ■ Data transfer: programmed I/O # Auxiliary Digital I/O ■ Numbers of channel: 8 inputs/outputs ■ Compatibility: 3.3 V/TTL (5 V tolerant) # Handshaking Signals Programmable polarity ■ Logic level: 3.3 V/TTL (5 V tolerant) ■ TRG\_IN source: AUX1, PXI trigger bus, PXI star trigger input S\_ADV destination: AUX0, PXI trigger bus # Safety Functions Emergency shutdown · Logic level: 3.3 V/TTL (5 V tolerant) · Active: logic low Watchdog timer · Base clock available: 10 MHz, fixed - Counter width: 32-bit # General Specifications I/O Connector: 62-pin D-sub male - Operating temperature: 0°C to 55°C ■ Storage temperature: $-20^{\circ}C$ to $70^{\circ}C$ ■ Relative humidity: 5% to 85% non-condensing Power requirements: (when all relays are ON)
Device+5 V+3.3 V
PXI-793 II A400 mA
Dimensions 160 mm x 100 mm (not including connectors) # Certifications ■ EMC/EMI: CE, FCC Class A # Ordering Information # PXI-7931 4x8 2-Wire Matrix Module \* Failure rate indicates the lower limit of switching capacity of a relay contact at a reliability level of 60% # Pin Assignment 2x4x4 configuration
22. C8+
43. C0+23. C8-1. R0+
44. C0-24. C9+2. R0-
45. C1+25. C9-3. R1+
46. C1-26. C10+4. R1-
47. C2+27. C10-5. R2+
48. C2-28. C11+6. R2-
49. C3+29. C11-7. R3+
50. C3-30. C12+8. R3-
51. C4+31. C12-9. R4+
52. C4-32. C13+10. R4-
53. C5+33. C13-11. R5+
54. C5-34. C14+12. R5-
55. C6+35. C14-13. R6+
56. C6-36. C15+14. R6-
57. C7+37. C15-15. R7+
58. C7-38. N/C16. R7-
59. N/C39. N/C17. N/C
60. AUX340. AUX418. AUX2/SHDNn
61. AUX641. +5Vout19. AUX5
62. AUX742. AUX1/TRG_IN20. GND
21. AUX0/S_ADV
![The image is a low-resolution, pixelated graphic containing no text. It features a black shape resembling the capital letter 'T' or a cross, centered against a background of light blue. To the right of the 'T,' the background transitions into a darker blue area, separated by a diagonal line. At the bottom of the image, there are black curved shapes that appear to be the top of a silhouette, situated below the 'T' shape.](.pxi-7931-datasheet-20191223/58c5dbcf3225c54aacfe6efc10adce94b1269a82b7c51806b0ae3dfb690be168.jpg) # Terminal Boards & Cables TB-6231-01 Multiplexer Switch Terminal Board with One 62-Pin D-Sub Female Connector ACL-10262 62-pin D-sub male/female cable, I M (For more information about mating cables, please refer to P4-28.) [🔗 Link to the original document](.pxi-7931-datasheet-20191223/pxi-7931-datasheet-20191223.pdf)