What limits the number of virtual input and output instructions in a plc ladder logic program?6/7/2023 The two logic gates that you will see represented most often in Ladder Logic are the AND and OR gates. ![]() ![]() Instead, we’ll just look at a few logic gates and how they work. Now, this blog is not intended to be a Digital Systems class so put away your Karnaugh maps, you won’t need them. And to do that, we need to first understand Boolean math and logic gates. So now that we have a understanding of what Ladder Logic is, we can dig a little deeper into how ladder instructions work. In Understanding Ladder Logic we touched on the origins of Ladder Logic, its structure and execution.
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