Safety switching device for the failsafe shutdown of an electrical load

摘要

A safety switching device for the failsafe shutdown of an electrical load has at least one input circuit for receiving an input signal from a signaling device which signals a safety-related state, an evaluation and control unit for evaluating the input signal, and at least one output circuit for outputting an output signal. The safety switching device further has at least one switching element for interrupting a current supply path to the load in dependence on the input signal. The input circuit and the output circuit are joined at a device connector so that the device connector can selectively be used as an input for receiving the input signal or as an output for outputting the output signal. The input circuit has a test switch which is coupled to the evaluation and control unit which is designed for selectively suppressing the input signal using the test switch.

主权项

1. In an installation comprising a hazardous machine and at least one signaling device for signaling a safety-related state of said machine, a safety switching device configured for failsafely shutting down the machine, the safety switching device comprising:
a number of connecting terminals, at least one input circuit for receiving an input signal from the signaling device, at least one output circuit for outputting an output signal, at least one switching element designed for interrupting a current supply path to the machine, and an evaluation and control unit connected to said at least one input circuit for receiving said input signal and connected to said at least one output circuit for transmitting said output signal to said at least one output circuit, said evaluation and control unit being designed for actuating the at least one switching element in dependence on the input signal, with the at least one input circuit and the at least one output circuit being connected to the same one of said number of connecting terminals so that said one connecting terminal can selectively be used either as an input terminal for receiving the input signal or as an output terminal for outputting the output signal, with the input circuit comprising a test switch coupled to the evaluation and control unit, and with the evaluation and control unit being designed for selectively suppressing the input signal using the test switch.