Yaskawa YASNAC PC NC PLC Programming Manual - Manual (Page 132)

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YASNAC PCNC PLC Programming Manual Chapter 4: Sequence Control Method
(5) Nesting in the Source File
The source file of a ladder program will usually be a very large file and editing is not a simple
task.
In compilation, the included file function allows the several divided files to be compiled in
one file.
[Main][High-speed scan sequence][Low-speed scan sequence1] [Low-speed scan sequence 2]
Fig. 7.1Nesting in the Source File
• As illustrated above, nesting of the files is possible up to two levels.
• Pseudo instructions for the start and end of a high-speed scan/low-speed scan ladder
(HIGHSEQUENCE, LOWSEQUENCE, ENDP) must always be written in a main file.
(a) Main file
The format of a source file is described below using this as an example.