Allen-Bradley 1746-NIO4V Analog Input Output Module

The Allen-Bradley 1746-NIO4V is a 4-channel analog I/O module for the SLC 500 backplane that combines two analog input channels with two analog voltage output channels in a single card. The two analog inputs are configured as differential AI channels for sensing from field devices, while the two voltage output channels are driven by a 14‑bit DAC, enabling precise control of analog actuators and interfaces. The module is designed to plug into a 1746-series rack and draws operating power from the backplane, making it compatible with standard SLC 500 configurations and Allen‑Bradley PLCs in the same family. With 14‑bit resolution on the outputs, the 1746‑NIO4V supports fine voltage control and is commonly used to interface sensors and transducers to SLC 500 controllers for process monitoring, lab automation, and machine control. This 2 AI / 2 AO combination module shares the same backplane communication and mounting footprint as other 1746 analog I/O modules, enabling straightforward panel integration for industrial control applications.