The Allen-Bradley 1771-IR is a PLC-5 RTD input module designed for precise temperature and resistance measurements, supporting Celsius and Fahrenheit with a resolution of 0.1 to 0.5 degrees. This input module accommodates six three-wire RTD inputs without requiring external power, offering a reliable solution for various industrial applications. The 1771-IR features smart troubleshooting aids, including bright status indicators on its front panel, enhancing system protection by quickly identifying input or output status. It operates seamlessly with PLC2, PLC3, and PLC5 controllers and is compatible with multiple chassis types, ensuring versatile integration into existing systems.