The Allen-Bradley 1771-IBN is a 32-channel DC input module for the SLC 500 family, designed to mount in a 1771 I/O chassis. It is a sinking input module that accepts a 10–30 V DC source on each channel, with inputs read as high-true (active when voltage is present). As a Series C 1771-IBN device, it provides 32 discrete digital inputs for PLC-5/SLC 500 installations, making it suitable for monitoring multiple field devices such as pushbuttons, limit switches, and sensors.
