Abstract: The invention relates to a safety communication system in a automation application (5), comprising a first communication bus (19) on which at least one first safety monitor (12) is connected fitted with several outputs (13), and a second communication bus (29) on which are fitted a second inputs safety module (25), capable of generating a second safety signal, and a second safety monitor (22) receiving said safety signal and fitted with several outputs (23), on the second communication bus (29). Outputs (13) of the first safety monitor (12) are electrically connected to inputs of the second inputs module (25) so as to control at least one output (23) of the second safety monitor (22) as a function of the state of the outputs (13) of the first safety monitor (12).

Abstract: The present invention concerns an interface module between a field bus and electrical equipment controlling and protecting an electric motor. The interface module includes an integrated circuit having data pins connected via input/output circuits to contacts or binary sensors or to coils or actuators of the electrical equipment. The data pins of the integrated circuit are connected via logic circuits to inputs or outputs which are greater in number than the data pins. The inputs/outputs are connected to coils or actuators and to auxiliary contacts or binary sensors of the electrical equipment.