Application examples for conventional PSRclassic safety relays
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5.3 Movable guards
Guards with an interlocking device are designed for executing the following functions
together with the machine control system:
– The hazardous machine functions “covered” by the guard cannot be performed until the
guard is closed.
– If the guard is opened while the hazardous machine functions are operating, a stop
command is triggered.
– The hazardous machine functions “covered” by the guard can be performed as soon as
the guard is closed. Closing the guard does not automatically initiate the hazardous
machine functions.
Interlocking devices can combine various functions and have a position monitoring function
for guards. The interlocking device detects whether or not the guard is closed and issues a
stop command. Some interlocking devices have a guard locking function which locks the
guard while the hazardous machine functions are performed. A separate status monitoring
function for guard locking devices monitors whether the guard locking device is locked and
generates a corresponding output signal.
Relevant standards – EN 14119 Safety of machinery - Interlocking devices associated with guards
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