Product : ISaGRAF V3
Date : 5-March-1996
File : Fbdorder.Compiling order and sorting for FBD diagrams.htm
Subject : Compiling order and sorting for FBD diagrams
Keywords: FBD - execution order
FBD diagrams are translated from the left to the right and from the
top to the bottom. The evaluation order is given by the outputs
(assignments, coils, function block activation...). This order can
be changed if the evaluation of a node requires the evaluation of
another node located below in the diagram.
Use the command Tools / Show execution order (Ctrl+F1) of the FBD editor.
Numbers will be displayed on your diagram showing the order of
each variable assignment and block call.
If you need more precise information about one particular case, you
can use the Workbench menus to see the FBD equivalence written in
ST. To do so, perform the following operations:
1- compile the program
2- at the end of the compiling, select "continue"
(keep compiler open)
3- run "preprocessor output' from "edit" menu in compiler menu
4- the ST equivalence is then displayed in compiler window
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