<4. Control Application Creation>
4.6.3 Modifying Logic of a POU
This section describes the procedure for modifying a created POU along with
precautions.
● Precautions on POU Modification
1. Selective Modification of POU is not Allowed
As described in the merits of componentization in Section 4.7.1, “Features of
Application Encapsulation,” once a registered POU is modified, the modification will
be reflected in all logic using that POU.
This also means that it is not possible to apply a logic modification to some
applications.
A new POU should be created if previous logics have to be kept in some
applications.
2. When increasing or decreasing the number of I/O terminals
Some logic modifications may involve increasing or decreasing the number of I/O
terminals.
For FBD or LD code worksheets, increasing or decreasing the number of I/O
terminals involves a graphical change.
To apply a graphic change requires redefinition of the POU as described later.
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