NI PXI-6521 8 Ch-Ch Iso DI, 8 Mech Relay DO & NI-DAQ (779313-01)

16-Channel, ±30 VDC, 8 Sink/Source Inputs, 8 Relay Outputs, Isolated PXI Digital I/O Module
The PXI‑6521 is an industrial digital I/O module with high channel isolation and industry-standard 24 V logic levels. For added safety, the PXI‑6521 requires a keyed connector. If a computer or application fault occurs, the PXI‑6521 can use digital I/O watchdogs to switch to a configurable safe output state to ensure detection and safe recovery from fault conditions. It also features programmable power-up states, digital filtering, and change detection for optimal control over your application.

Key product

Digital I/O
Number of channels 16 (eight optically isolated digital input channels
and eight non-latching relay output channels)
Data transfers Interrupts, programmed I/O
I/O connector 37-pin keyed male D-SUB
Isolated Inputs
Number of input channels 8 (each bipolar and isolated from other channels)
Configuration 8-channel optically isolated digital inputs
Input voltage range –30 VDC to 30 VDC, P0.X+ to P0.X–;150 V
Isolation
Channel-to-channel 60 VDC continuous2
Channel-to-bus 150 V continuous3
Channel-to-earth 150 V continuous4
Input current
11 V inputs 4.5 mA/channel maximum
30 V inputs 12.5 mA/channel maximum
Propagation delay 45 s typical

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NI PXI-6521 8 Ch-Ch Iso DI, 8 Mech Relay DO & NI-DAQ (779313-01)

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