Tag: scanning

Ladder Logic 105: PLC Scanning

In my last post on PLC Memory Organization, I mentioned that I had not really covered how scanning actually works in a programmable controller. This is certainly a topic that needs to be discussed for an understanding of PLC programming,

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Ladder Logic 207: Interrupts and Periodic Tasks

Today’s post is in response to Darko’s comment on my Ladder Logic 206: Scanning post. He mentioned that readers might want to learn a little bit about interrupts. It can be difficult to discuss this subject generically since different manufacturers

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