Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 341)

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DMS 3.2 EN 02/2011 TD29 339
When this command is selected the first thing to happen is that the elements are
ordered topographically. A new sequential processing list is then created. Based on the
known values of the inputs, the computer calculates which of the as yet not
numbered elements can be processed next. In the above "network" the block AND, for
example, could be processed immediately since the values at its inputs (1 and 2) are
known. Block SUB can only then be processed since the result from ADD must be
known first, etc.
Feedback paths are inserted last.
The advantage of the data flow sequencing is that an output box which is connected
to the output of a block comes immediately after it in the data flow sequencing
system which by topological ordering would not always be the case. The topological
ordering can deliver another result in some cases than ordering by data flow, a point
which one can recognise from the above example.
'Extras' 'Create macro''
Symbol:
With this command, several POUs that are selected at the same time can be
assembled into a block, which can be named as a macro. Macros only can be
reproduced by Copy/Paste, whereby each copy becomes a separate macro whose
name can be chosen independently. Macros are thus not references. All connections
that are cut by the creation of a macro generate in- or out-pins on the macro.
Connections to inputs generate an in-pin. The default name appears next to the pin in
the form In<n>. For connections to outputs, Out<n> appears. Affected connections
which had connection markers prior to the creation of the macro, retain the
connection marker on the PIN of the macro.
At first, a macro has the default name "MACRO". This can be changed in the Name
field of the macro use. If the macro is edited, the name of the macro will be displayed
in the title bar of the editor window appended to the POU name.