Can you still control outputs when the PLC is stopped?
In industrial automation, it’s natural to expect the PLC to stay in charge of the process, even when things go wrong. Students often ask whether outputs can still be controlled if a PLC transitions into STOP, especially with time-based conditions like shutting something down after 10 seconds or enabling an output after a minute. At first glance, this sounds reasonable, but once you understand how a PLC behaves in STOP, the limitations become very clear.
This article breaks down what actually happens when a PLC stops, why timed logic is no longer possible, and what realistic design alternatives exist when output behavior during faults really matters.
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