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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.