XOR output forced to 0 by duplicated input Module 1,01,02 Block 1001 fed twice into FC 101 Module 1,01,02 Block 1003
This block always outputs zero, because both its inputs are from the same source. It may not be clear that the logic has been disabled.
The message is intended to encourage documentation of forced logic, or removal of unused logic.
This message shows a potential error in the system configuration, although most such errors prove to be harmless. It should be reviewed and hidden, unless it shows an issue that should be addressed.
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