(8) As soon as the “Guard Lock” operator detects that the guard lock is locked and the
gate is closed, the “Output1” signal switches to LL1.
Figure 118 - Traces relative to “Guard Lock” block operation in the “Mandatory gate opening
mode”.
In “Mandatory gate opening” mode, the “Guard_lock” operator indicates an error
condition if it does not detect that the gate has been opened following a request to
unlock the guard lock. This concept is highlighted in the figure below
(Figure 119). In this case, the “Enable Error out” option has been selected in the
diagram in Figure 117, so that the error is shown in the graph.
As previously described, the operator requests unlocking of the guard lock, but the
door is never opened, and this condition is indicated by the "FBK_GATE" signal,
which stays at LL1. Thus, when the guard lock unlocking/locking cycle ends, at time
"E", the “Guard_Lock” operator switches the status of the “ERROR” signal from LL0
to LL1.
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