상황
A manufacturing engineer documenting a bottling-line PLC program for new operators needs a clean ladder diagram.
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01
ESTOP and JAM are XIO (normally-closed contacts) so conveyor stops immediately on either fault — fail-safe wiring.
02FILL_TIMER.EN triggers the valve, .DN closes it
valve is open for exactly the timer preset period.
03
Latching OTL on JAM_ALARM requires an explicit operator reset — prevents auto-restart after jams.
Add a label applicator rung and a bottle-count accumulator (CTU) for production tracking.