Allen-Bradley 1771-IR RTD Input Module

The Allen-Bradley 1771-IR RTD Input Module is a six-channel RTD input card designed for PLC-5 systems, providing direct interface of multiple RTD sensors to the controller for precise temperature monitoring and control. It supports six RTD inputs and accommodates both two-wire and three-wire RTD configurations, enabling accurate measurement across several sensors within a single module. The unit is powered from a 5 V DC supply with a rated current draw around 0.95 A, and it plugs into the 1771 I/O backplane to transfer RTD data to the PLC for processing. Typical applications include multi-point temperature sensing in process control, HVAC and industrial equipment monitoring, and other scenarios where reliable RTD data drives control decisions.