CAN module with 4 digital inputs that can be operated as contact or voltage inputs. Suitable for recording switch states, e.g. for electrical limit switches on ventilation flaps or auxiliary contacts on power contactors. The field bus module is a universally applicable input module that is controlled via the CAN bus. The module is addressed via an adjustable address and the states of the inputs are transmitted in the data bytes. If one (or more) relay output modules with the same address are present in the system, the corresponding outputs are switched. , Connection with screw terminals