Allen-Bradley 1746-NI4 is a four-channel, differential analog input module for the SLC 500 PLC family. Each of its four channels can be configured to measure either voltage or current signals (per channel), with voltage inputs supported up to ±10 V DC and current inputs up to ±20 mA. The module fits in a single 1746 backplane slot and interfaces with SLC 500 controllers as part of the standard 1746 I/O system. Rockwell Automation notes that the 1746-NI4 was discontinued as of April 29, 2021.
