A system for controlling a process. A a control unit includes a controller, capable of transmitting data to at least one actuator capable of affecting the process, which may be controlled by the controller. The controller also being capable of transmitting data to at least one sensor capable of measuring parameters of the process and transmitting data to the controller. The control unit is arranged for wireless communication over a wireless network. The controller and one of the at least one actuator or the at least one sensor are co-located such that communication between them is not transmitted over the wireless network.