CLICK PLC Units are available with different combinations of built-in discrete inputs/outputs, analog inputs/outputs and communication ports. 
With up to 14 built-in I/O points, the CLICK CPLC Unit can be used as a ready-to-go PLC control system without any additional I/O modules. 
Up to 8 I/O modules can be connected to a CLICK PLC Unit to expand the system I/O count and meet the needs of a specific application.