National Instruments Corporation NI 9421 DSUB, 24 V, 100 MS, 8-Ch Sinking DI Module
- 8-channel, 100 s digital input
- 24 V logic, sinking digital input
- Compatible with NI CompactDAQ counters
- 60 VDC, CAT I (D-SUB) or 250 Vrms, CAT II (screw terminal) isolation
- 25-pin D-SUB or 10-position screw-terminal connectors available
- -40 C to 70 C operating, 5 g vibration, 50 g shock
- Configure Complete CompactRIO or NI CompactDAQ System
- View Data Sheet
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The NI 9421 (part number 779136-01) is an 8-channel, 24 V sinking digital input module designed for use with the National Instruments CompactDAQ and CompactRIO platforms. It features a DSUB connector and supports input signals up to 24 VDC with a typical input delay of 100 ¼s. The module is engineered for industrial environments, providing channel-to-channel isolation and compatibility with a wide range of industrial sensors and switches. The NI 9421 is hot-swappable and offers high reliability for monitoring digital signals in automation, control, and data acquisition applications. It is designed to meet stringent safety and performance standards, ensuring robust operation in demanding conditions.