PRE-RESET (max number = 32 with other RESTART operators)
The PRE-RESET operator can be used when there
is no possibility of having a single reset button in a
position from which a complete visibility of the
hazardous area is available.
In this case it is necessary to use a PRE-RESET
button inside a zone of operation with a complete
visibility and a RESET button outside the zone of
operation to activate the Q output.
For both Pre-reset and Reset inputs the transition
0->1->0 is considered a valid signal. It is mandatory
that the pulse 0->1->0 has a maximum duration of
5s.
Parameters
Time: The external reset is operative if pressed within a preset time configurable by the user in
the range 6...120s
Blocking Mandatory: If selected, the minimum number of interruptions (of the light curtain or
similar) is 1 before the RESET signal can be activated.
If you specify a BLOCKING NUMBER other than 1, this number corresponds to the maximum
permissible number of interruptions.
Blocking number: Blocking number has the range from 1 to 7.
Reset Request: Enabling this item will make available an output from this operator. This signal is 1
from the PreReset signal transition to the end of the allowable time or to the next Reset signal
transition.
Enable Clear: If selected, enables an input to reset the memorization.
The behavior of the PRE-RESET operator is shown in the following timings:
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