Allen-Bradley 1771-IBD 8-Point DC Input Module

The Allen-Bradley 1771-IBD 8-Point DC Input Module is a digital input module for 1771 I/O backplanes used in PLC-5 and SLC 500 systems, delivering eight discrete DC input points. It accepts DC signals in the 10–30 V DC range and is designed for wiring field devices such as switches and proximity sensors directly to the module, which then reports their on/off states to the controller via the 1771 I/O bus. The module is intended for installation in a 1771 I/O chassis and shares backplane power and communication with other 1771 modules. Key electrical specs include eight input channels operating within a 10–30 V DC range, with a nominal current draw at 24 V DC of about 8.4 mA, enabling scalable, modular I/O for automation tasks like machine control, line monitoring, and safety interlocks.