Leuze electronic
MSI-TB
13
Safety relays are used together with single- or multi-beam light beam safety devices, e.g. as access
guarding for danger zones. Because light beam safety devices only detect persons upon entry into the
danger zone, and not whether a person is present in the danger zone, the safety relay only triggers the
switch command upon entry of a person into a danger zone. Access guarding may therefore only be oper
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ated with activated start/restart interlock or additional safety measures must be taken.
Figure 5.1: Intervention control on packaging machinery
