A system comprising at least one output device (406, 660) and a manually actuatable integrated unit module (500, 520, 600), said manually actuatable integrated unit module (500, 520, 600) comprising: a first printed circuit board (501, 601) comprising: a switch operator device (504-506, 650), movable between at least a first and a second position; at least a first electrical switch (503a, 603a), mounted on the surface of the first printed circuit board (501, 601) in such a way that movement of said switch operator (504-506, 650) between said at least first and second position will cause a change in mode of said at least first electrical switch (503a, 603a); and such a change of mode will cause a control signal to be transferred via a common communications link (512,612) associated with the manually actuatable unit module (500, 520, 600) for controlling the at least one output device (406, 660); said manually actuatable integrated unit module (500, 520, 600) also comprising a second printed circuit board (502, 602) comprising at least one Actuator Sensor Interface slave module mounted on the second printed circuit board (502, 602), the second printed circuit board is arranged for handling a first printed circuit board (501, 601), said second printed circuit board (502, 602) having inputs for receiving signals from said at least first electrical switch (503a, 603a) on said first printed circuit board (501, 601), and also having outputs for transmitting signals from the slave module to output means on said first printed circuit board (501, 601), where the inputs are arranged to handle at least a 4-bit word, and where the outputs are arranged to handle at least a 4-bit word, wherein said change of mode of said at least first electrical switch (503a, 603a), activating said at least one slave module in such a way that said control signal on said associated common communications link (512, 612) is produced, is adapted to control said at least one output device (406, 660), and characterized in that said at least one slave module is connected to said at least one output device (406, 660), wherein said at least one output device (406, 660) is a master module in a control system, such as a Programmable Logic Controller or a Microcomputer, controlling in a pre-determined and cyclic way said at least one slave module. a switch operator device (504-506, 650), movable between at least a first and a second position; at least a first electrical switch (503a, 603a), mounted on the surface of the first printed circuit board (501, 601) in such a way that movement of said switch operator (504-506, 650) between said at least first and second position will cause a change in mode of said at least first electrical switch (503a, 603a); and such a change of mode will cause a control signal to be transferred via a common communications link (512,612) associated with the manually actuatable unit module (500, 520, 600) for controlling the at least one output device (406, 660); said manually actuatable integrated unit module (500, 520, 600) also comprising a second printed circuit board (502, 602) comprising at least one Actuator Sensor Interface slave module mounted on the second printed circuit board (502, 602), the second printed circuit board is arranged for handling a first printed circuit board (501, 601), said second printed circuit board (502, 602) having inputs for receiving signals from said at least first electrical switch (503a, 603a) on said first printed circuit board (501, 601), and also having outputs for transmitting signals from the slave module to output means on said first printed circuit board (501, 601), where the inputs are arranged to handle at least a 4-bit word, and where the outputs are arranged to handle at least a 4-bit word, wherein said change of mode of said at least first electrical switch (503a, 603a), activating said at least one slave module in such a way that said control signal on said associated common communications link (512, 612) is produced, is adapted to control said at least one output device (406, 660), and characterized in that said at least one slave module is connected to said at least one output device (406, 660), wherein said at least one output device (406, 660) is a master module in a control system, such as a Programmable Logic Controller or a Microcomputer, controlling in a pre-determined and cyclic way said at least one slave module.