Allen-Bradley 1771-IAD NSNBC01 Analog Input Module

Allen-Bradley 1771-IAD NSNBC01 is a 16-point digital input module for the 1771 Universal I/O family, used with PLC-5 controllers to read state signals from field devices. It accepts AC or DC input signals, specifically 120 V AC or 125 V DC, and presents each channel as a discrete input to the processor via the 1771 I/O backplane. Designed to be installed in a 1771 I/O chassis, the NSNBC01 variant integrates into the PLC-5 backplane architecture to provide real-time digital input data for logic decisions, interlocks, and monitoring routines. Common applications include reading the status of switches, relays, sensors, and other on/off devices in industrial automation, where multiple inputs are required across a single module. This module is part of the Allen-Bradley 1771 series and is typically used in legacy PLC-5 installations that rely on 1771 I/O modules for scalable, modular input configurations.