Controls Inc controller platforms are expandable utilizing modular I/O expansion modules. The XCAN-IO expansion modules communicate via J1939 CANbus with the controller. Each XCAN-IO module has 4 digital inputs, 4 analog inputs and 6 relay outputs. Up to four XCAN-IO modules can be installed with a single controller to provide sophisticated control systems that are simple, modular and cost effective. Configuration is simple and flexible.