Interface module for a fieldbus and an electric control and protection device for an electric motor

摘要

The interface module interfaces the field bus (B) and equipment (C) controlling and protecting the three-phase AC motor (M). The interface module includes an integrated circuit (2) with data terminals (D0-D3) connected by input/output circuits (3) to contacts (e.g. a1) or actuators (KM1). Two logic circuits (8,9) connect the data terminals to a larger number of input or output terminals (e.g. A,T). Another chip terminal (DSTB) is connected to a guard-dog circuit (6) which sends a stop command to the actuator(s) if the master/slave dialogue is interrupted. Different modes can be selected by a local control pushbutton or lever (7).