The NI ‑ 9423 uses industrial logic levels and signals so it can be connected directly to a wide variety of industrial switch modules, converters, and other devices. Each channel is compatible with 24 V logic levels, can accept discrete logic levels of up to 30 V and has an LED status display. The NI ‑ 9423 has isolation between the input and output banks and resistance isolation from channel to ground. The NI ‑ 9423 is a correlated digital module that enables correlated measurements, triggering and synchronization when installed in a CompactDAQ chassis.
 Product features:
-  Number of pure digital input channels: 8
-  Number of pure digital output channels: 0
-  Number of bidirectional digital channels: 0
-  Logic level of the digital I / O: 12 V 24 V.
-  Maximum update rate: 1 µs
-  Current flow direction: Current sinking input
-  Isolation of the digital I / O: 250 Veff Isolation of the channel from ground
-  Connection type front: screw connection
-  Protective coating: no
-  With housing: yes
-  Supported hardware platform: CompactDAQ, CompactRIO