National Instruments Corporation NI 9421 Screw Term, 24 V, 100 µs, 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: 779002-01) is an 8-channel, 24 V sinking digital input module designed for use with the National Instruments CompactDAQ and CompactRIO platforms. It features a screw terminal connection type and supports input signals up to 24 VDC. The module offers a channel-to-channel isolation of 60 VDC and a typical input delay of 100 µs, making it suitable for industrial digital input applications such as monitoring switches, relays, and proximity sensors. The NI 9421 is engineered for high reliability in harsh environments, with a wide operating temperature range and robust signal integrity. It is hot-swappable and supports NIs software-configurable platforms for flexible integration.