July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH004.3D – 40 – [40–54/15] 19.6.2004
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4
Modifications to an existing project
After a PLC-controlled project has been in use, it is quite possible that modifications
will be required to the ladder diagram to enable the performance of the project to be
enhanced. This section describes how additions can be made to the ladder diagram and
how parts can be deleted.
4.1 Copying a project
Before an existing project is modified it is advisable that a copy is made, but with a
different filename, and that the modifications are made to the copy of the ladder diagram.
This ensures that when modifying a project, the original ladder diagram is still retained.
This is necessary in case the
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