Or someone else with a different computer could accidentally mark a rung for deletion somewhere deep inside the program and you make an edit somewhere else. You can now go offline and come back to this PLC another day and that rung is still marked for deletion. You saw how easily you could accidentally hit the delete key and mark a rung for deletion. Here is the trick to the capital DDDDDDs that makes them not so obvious. One seemingly obvious indicators is the DDDDDDs on the left side of the rung.Ĭapital letters in the area circled in red to the left of the rung means these edits are in the PLC processor. You have two indicators that this has happened: While it isn't deleted yet, it has been marked in the processor to be deleted during the next test of edits. THIS IS IMPORTANT! It really is that easy to delete a rung in a program.
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