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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
16-Channel, ±30 VDC, 8 Sink/Source Inputs, 8 Relay Outputs (150 V), Isolated Digital I/O Device—The PCI-6521 is an industrial digital I/O module with high channel isolation and industry-standard 24 V logic levels. If a computer or application fault occurs, the PCI-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.
Explore articles written by our support engineers to help you troubleshoot problems and complete common tasks.
Learn how to connect and configure your hardware to take your first measurement.