In simatic manager, if I go to "CROSS-REFERENCE", a window appear in which we can see which Io, timer, counter and M bits are used and which are not used and it is very easy to find out unused io, timer, counter in this way. Is there any option in TIA portal like that?
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Well, that was strange forum error, lost 1 pic and all my answer text)) You can use cross-reference in TIA like inStep 5.5. To look at used symbols use Assigment list