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What do "and" or "not" symbols in Instrument diagrams specifically means?

Related to PID's for Instrumentation and electrical combined.

Electrical Controls
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Question added by Leonardo Banzali , Electrical Maintenance-trainer , Sadara Chemical Company
Date Posted: 2013/09/06
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Abdallah Mohd. Alnoor abubaker
by Abdallah Mohd. Alnoor abubaker , Section Head, Facility & Engineering , PETROENERGY E&P

means the Logic diagrams in order to built you cause and effects diagrams and action results.

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