The Allen-Bradley 1771-IBD PLC-5 Digital Input Module is a 16-channel DC input module for PLC-5 systems that accepts 10–30 V DC field signals and converts them to logic-level inputs for the backplane. It supports sink or source loading depending on how the module is wired in the 1771 I/O chassis, enabling flexible interfacing with a wide range of sensors and switches. The module draws a backplane current of about 130 mA and uses the 1771-WH wiring arm to connect field devices. Typically deployed in PLC-5 1771 I/O racks, the 1771-IBD provides 16 discrete digital inputs for monitoring and control in industrial automation.
