The Allen-Bradley 1746-NIO4I is a 4-point analog I/O module for SLC 500 racks, combining two differential analog input channels and two current output channels in a single 1746 slot. Each input channel is configurable per channel for voltage (±10 V DC) or current (±20 mA) and uses differential signaling, with inputs not individually isolated. The two current outputs deliver 0–20 mA for actuators or instrumentation in process control loops. Designed for use in 24 V DC powered SLC 500 systems, the NIO4I is part of Allen-Bradley’s 1746 analog I/O family and relies on the backplane for power and communications.
