Allen Bradley 1771-CE 1-Foot I/O Chassis Cable for PLC-5 By wayne No Comments on Allen Bradley 1771-CE 1-Foot I/O Chassis Cable for PLC-5 3 Min Read Shop the Allen Bradley 1771-CE I/O chassis cable for PLC-5 systems. This 1-foot cable with 9 pins ensures a robust connection to your 1771-P2 power supply.