Allen-Bradley 1771-PDC Programmable Logic Controller Module

Allen-Bradley 1771-PDC is a two-loop PID control module designed for the PLC-5/1771 system backplane, delivering closed-loop process control within an AB automation rack. It provides two analog input channels and two analog output channels for direct sensor and actuator interfacing, with analog inputs and outputs supporting 1-5 V DC and 4-20 mA signals, and it uses a scaled BCD data format (±9999) for process values. The module draws from the backplane and an external power supply, requiring ±15 V DC and has a backplane current draw around 1.2 A; I/O wiring is via 1771-WF hardware, and the 1771-PDC supports two PID control loops in a compact 1771 package.