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Coil does not energise during Online test

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  • MVP 2023

Here is a list of things to check:

1) If the coil is in a subroutine, make sure the subroutine is active (look for where it is actually called and make sure it is actually being called)

2) Make sure there isn't a Direct coil with that same address elsewhere in the program (use find operand to create a list)

3) Make sure the Reset coil(s) are not activated

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Back track your logic from the coil you want to set.  Look at the preceding statement, does it have a rung that sets it's status.   Work backward from there to check the logic.


Also, if you're working online while doing this.  Make sure the PLC has the current program you're reading from loaded.  The software and PLC do allow you to have different programs active and viewed in visilogic but the operands all update as if there is no difference.

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