Allen-Bradley 1771-ILK Isolated Analog Input PLC Module | 8-Channel By wayne No Comments on Allen-Bradley 1771-ILK Isolated Analog Input PLC Module | 8-Channel 3 Min Read Buy the Allen-Bradley 1771-ILK isolated analog input module for PLC-5 systems. This 8-channel module offers 1000V isolation and high-resolution signal processing.