Compilier warnings impact on cpu performance?
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Directly - no. Compiling happens in the Engineering station only. The PLC is not involved.
Indirectly - Eventually it is quite possible. It depends what you are being warned about. If you are calling the same fuction block multiple times when you should not, or you have code sorting errors or you are not calling function blocks at all then there can be some minor effects. If your IO scan times, bus settings etc are wrong you could potentially have serious problems. It is not really possible to say.