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NI PXI-6521
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NI PXI-1033
NI PXI-1033

NI PXI-6521

Product Name:​ PXI-6521 8-Channel Relay Output / 8-Channel Isolated Digital Input Module
Introduction:​ Industrial-grade digital I/O module with electromechanical relays and isolated inputs for switching and sensing in noisy environments.
Category:
Description
Technical Specifications:
  • Digital Input: 8 channels, isolated, 0–24 VDC, 5 kV isolation
  • Relay Output: 8 Form-C (SPDT) relays, 30 VDC / 1 A, 60 W max
  • Update rate: static or event-based
  • FIFO: small onboard buffer for pattern I/O
  • Connector: 68-pin SCSI (VHDCI)
    Functional Features:​ Channel-to-channel isolation; suitable for driving solenoids, indicators, or reading limit switches.
    Structure:​ 3U PXI module, shielded metal front panel, relay bank with LED per channel.
    Working Principle:​ FPGA manages I/O scanning; relays actuate via driver transistors; optocouplers isolate inputs.
    Applications:​ Manufacturing test, process control, hardware-in-the-loop.
    Notes:​ Mechanical relay life ~100k cycles; avoid inductive kickback without flyback diode; do not exceed 1 A per channel.
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