PLC Usage Explained
in
Parking and access control equipment manufactured in the UK
Automatic Raise Arm Barriers
5 seconds Sets the delay before the gate closes after the
photocells are clear. This is only active if Auto
Close is enabled (see section 3.4.1). The exact
behaviour is affected by the early close option –
see section 3.4.2.
T2: No
passage
timer
45 seconds If auto close is enabled and the gate is opened but
20
no vehicle passes through, the gate will close
automatically after this period.
T3:
Pedestrian
timer
4 seconds This determines how far the gate opens in
pedestrian passage mode – the motor will run for
this many seconds and then stop.
T7: Loop
disable delay
3 seconds The free exit loop is disabled for this length of time
after a vehicle has passed through the photocells.
This is so that vehicles entering through the gate
do not trigger the gate to open again if they pass
over the free exit loop after passing through the
gate.
TD: Safety
stop timer
30 seconds If “safety stop mode” is
disabled
in the menu
system, then this timer sets the delay before the
gate will resume normal operation after a safety
event.
