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The I/O’s that are covered by the PLC symbol library are either digital or analogue and defined as either in or output. The purpose of these definitions is to facilitate the booking of I/O symbols for PLC mirrors.

 

So, how should programmable I/O’s that can be used as both in and output be handled?

 

The answer is that it doesn’t really matter. The only thing that is important is that you make a decision and stick to that. Either you treat them as input or as output. Please be consistent however!