Allen-Bradley 1771-IBD PLC Module

The Allen-Bradley 1771-IBD is a 16-point DC digital input module designed for PLC-5 systems, and it installs in a 1771 I/O chassis where it receives power from the chassis backplane. It provides 16 input points rated for 10–30 V DC and supports both sink and source wiring configurations, allowing flexible connection of field devices to the PLC-5 I/O rack. As a Series B input module, the 1771-IBD is intended for use in Allen-Bradley Universal I/O Chassis such as 1771-A1B, 1771-A2B, 1771-A3B, or 1771-A4B, and is typically complemented by the 1771-WH wiring arm for terminations. The module draws about 130 mA from the backplane, ensuring the backplane supply can accommodate multiple I/O modules in a single rack; power is not supplied locally on the module. The 1771-IBD is an input module within the PLC-5 I/O family, enabling direct reading of 10–30 V DC signals into the PLC-5 controller for discrete input applications.