Reer MZERO Installation, Use And Maintenance Manual page 72

STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
Description of "GUARD LOCK" operator inputs/outputs
"Lock_fbk" input
The "Lock_fbk" input is used to detect the status (feedback) of the electromagnet that
unlocks/locks the guard lock.
Electromechanical guard locks are unlocked/locked via an electric control that energises/de-
energises an electromagnet. Its status (energised/de-energised) is indicated by appropriate
contacts. For example, the status of the electromagnet may be indicated by a normally open
Figure 31
contact that is closed when the electromagnet is energised, as in the case shown in .
Figure 31 - Example of feedback of the status of the electromagnet of a guard lock.
The signal received by the module is processed by the "Guard Lock" operator.
"Gate" input
When the "Gate" input is present, it detects the status (feedback) of the door/gate connected to
the guard lock.
The status of the door/gate (GATE) is detected using specific contacts. For example, the status of
the door/gate may be indicated by a normally open contact that is closed when the door/gate is
Figure 32
closed, as in the case in .
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