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Last update: 29 Apr, 2024 220 Views

How do you know when a plc has set a bit? The fact that the output channel LED is energized (and the “Burner lit” indicator lamp is energized) tells us the PLC program has “set” that corresponding bit in the PLC’s output memory register to a “1” state. A display of input and output register bits shows the “set” and “reset” states for the PLC at this moment in time:

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What are transition sensing contacts in plc? The IEC 61131-3 PLC programming standard specifies transition-sensing contacts as well as the more customary “static” contacts. A transition-sensing contact will “actuate” only for a duration of one program scan, even if its corresponding bit remains active.

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