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scan time

How long one scan takes, usually a few milliseconds. The PLC checks every rung once per scan, so a shorter scan time reacts sooner to a change.

One scan: read all inputs, run the rungs from top to bottom, write all outputs, then start again.1Read inputsAll inputs,all at once2Run rungsTop to bottom,left to right3Write outputsAll outputs,all at onceThen again. The Scan setting (20 ms) sets how often.

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