Product specs for National Instruments Corporation 779137-01

The NI 9421 is an 8-channel, 100 s sinking digital input module for any NI CompactDAQ or CompactRIO chassis. Each channel is compatible with 24 V signals and features transient overvoltage protection of 2,300 Vrms between the input channels and earth ground. Each channel also has an LED that indicates the state of that channel. The NI 9421 works with industrial logic levels and signals to directly connect to a wide array of industrial switches, transducers, and devices.

You can choose from two connector options for the NI 9421: a 10-position screw-terminal connector and a 25-position D-SUB connector. This industry-standard 25-position D-SUB connector provides for low-cost cabling to a wide variety of accessories from NI or other vendors. Some vendors with custom D-SUB cable fabrication services can deliver cables with pinouts that match your exact application needs.

Recommended Accessories
-NI 9924 or other 25-pin D-SUB connector (for D-SUB variant)
-NI 9927 strain relief and operator protection (for screw-terminal variant)

Optional Accessories
-NI 9936 extra screw-terminal block (qty 10)
-NI 9980 extra spring-terminal block (qty 10)
Note: The NI 9980 is not compatible with the NI 9927 and must be used with low or nonhazardous voltages or installed in a properly rated enclosure.

Box Contents
-1 NI 9421 C Series module
-1 NI 9421 Operating Instructions and Specifications manual
-1 NI 9936 10-position connector (for screw-terminal variant)