情境
A manufacturing engineer documenting a bottling-line PLC program for new operators needs a clean ladder diagram.
這張圖裡有什麼
看懂背後的決策。
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.