Allen-Bradley 1771-IL Isolated Analog Input Module is an eight-channel, galvanically isolated analog input module designed for PLC-5 systems. It plugs into a 1771 I/O chassis and, when used with the 1771-WF field wiring terminal block, provides isolated input paths for eight analog signals, protecting the controller from transients and ground loops on the sensor side. This module is used to convert sensor voltages into a digital representation for the PLC-5, accepting standard analog input signaling and enabling reliable sensing in environments with electrical noise or grounding differences.
