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What is the difference between P_TRIG and -|P| in tia portal?

Hi,

What is the difference between P_TRING and |P| ladder instruction.

and why I should affect a tag below the two instructions?

Thanks for replies

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1 Answer

  1. Hi,

    use P_TRIG to monitior everything in the left of this instruction. It turns to ON for one scan when the entire set of logic to the left goes from off to on
    use -|P| to monitor a single tag. it turns on one scan when the tag goes from off to on.

    Best regards

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