19. PLC Forcing: When to Use It and When Not To ( 19 to 35 )


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In PLC troubleshooting, one of the most powerful and dangerous tools is forcing.

A PLC force allows a technician or programmer to manually override the normal state of an input or …

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31. PLC Modes: Auto / Manual / Maintenance / Setup (31 of 41)


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PLC Modes in Real Industrial Systems

Almost every industrial machine operates under different modes of operation.

These modes define:

Who is in control (operator or PLC)

What actions are allowed

What safety rules apply

How outputs …

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