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Technical content

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 ˙ 24-CH DPDT (2 Form C) non-latching relays ˙ Switching capacity w2 A switching, 2 A carrying w220 VDC, 125 VAC ˙ Onboard 1 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 ˙ Multiple modules synchronization through PXI trigger bus and star trigger ˙ Fully software programmable ˙Operating Systems wWindows 7/10 x64/x86 ˙Driver and SDK wVB/VC++ wLabVIEW 24-CH 2-Wire Multiplexer Module PXI-7921 Specifications Relay Characteristics ˙ Number of channels: 24 (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: 108 operations min.
  • Electrical life : 5x105 operations min. (1 A @ 30 VDC, resistive load) ˙ Data transfer: programmed I/O Handshaking Signals ˙ Programmable polarity ˙ Logic level: 3.3 V/TTL (5 V tolerant) ˙ TRG_IN source: PXI trigger bus, PXI star trigger input S_ADV destination: PXI trigger bus Safety Functions ˙ Emergency shutdown
  • Logic level: 3.3 V/TTL (5 V tolerant)
  • Active with 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˚C to 70˚C ˙ Relative humidity: 5% to 85% non-condensing ˙ Power requirements: (when all relays are ON) Certifications ˙ EMC/EMI: CE, FCC Class A Terminal Boards & Cables ˙TB-6221-01 Multiplexer Switch Terminal Board with One 62-Pin D-Sub Female Connector ˙ACL-10262 62-pin D-sub male/female cable, 1 M (For more information about mating cables, please refer to P4-28.)

Ordering Information

˙ PXI-7921 24-CH 2-Wire Multiplexer Module * Failure rate indicates the lower limit of switching capacity of a relay contact at a reliability level of 60% CN1 Pin Assignment 22. +5Vout 43. COM2+ 23. CH8+ 1. CH0+ 44. COM2- 24. CH8- 2. CH0- 45. COM3+ 25. CH9+ 3. CH1+ 46. COM3- 26. CH9- 4. CH1- 47. CH18+ 27. CH10+ 5. CH2+ 48. CH18- 28. CH10- 6. CH2- 49. CH19+ 29. CH11+ 7. CH3+ 50. CH19- 30. CH11- 8. CH3- 51. CH20+ 31. CH12+ 9. CH4+ 52. CH20- 32. CH12- 10. CH4- 53. CH21+ 33. CH13+ 11. CH5+ 54. CH21- 34. CH13- 12. CH5- 55. CH22+ 35. CH14+ 13. COM0+ 56. CH22- 36. CH14- 14. COM0- 57. CH23+ 37. CH15+ 15. COM1+ 58. CH23- 38. CH15- 16. COM1- 59. 1WireloRef 39. CH16+ 17. CH6+ 60. TRG_IN 40. CH16- 18. CH6- 61. S_ADV 41. CH17+ 19. CH7+ 62. SHDNn 42. CH17- 20. CH7- 21. GND Multiplexer One 48x1 One 24x1, Two 12x1, Four 6x1 One 12x1 Source Wire 1-wire 2-wire 4-wire +5 V 1 A +3.3 V 400 mA Device PXI-7921 Switche s Updated 12-23, 2019. ©2019 ADLINK Technology, Inc. All Rights Reserved. All specifications are subject to change without further notice.