National Instruments Corporation NI 9421 Spring Term, 24 V, 100 MS, 8-Ch Sinking DI Module
The NI-9421 (part number 783734-01) is an 8-channel, 24 V sinking digital input module for NI CompactDAQ and CompactRIO systems. It features spring terminal connectivity for secure and tool-free wiring. The module offers a 100 µs update rate per channel, making it suitable for high-speed digital input applications. Designed for industrial environments, the NI-9421 provides channel-to-channel isolation and is engineered for reliable operation in harsh conditions. It is compatible with a wide range of digital sensors and switches, supporting flexible integration into measurement and control systems.