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Additional Guidelines for IEC Hot Standby
840 USE 106 00 January 2003 159
Use Constants Instead of Open Inputs
Programmed
Logic
The number of unused pins should be reduced to the absolute minimum, so as to
not waste any memory for hidden allocated memory that is used nowhere.
But there are some cases where this is just not possible, as in the example below.
Therefore the logic should look like the diagram below.