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Only rarely are safety sensors used individually. Usually, several sensors that act together on a single switch-off circuit are used, e.g. access guarding with a Multiple Light Beam Safety Device and a protective door to the danger zone. Or if a Multiple Light Beam Safety Device is used at both the entry and the exit of a robot cell for safeguarding. In the case of point of operation guarding with a Safety Light Curtain and a Multiple Light Beam Safety Device for rear zone guarding of a press, the sensors must likewise be connected to a common switch-off circuit.
The MSI-SR5 Safety Relay can perform these tasks economically. Here, two devices can be connected at the entries, either with two transistor OSSDs or by designing as a two-channel contact circuit.
Furthermore, the start/restart interlock and contactor monitoring functions are available. The compact construction and function selection by means of wiring make possible simple, space-saving and economical applications.
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