<4. Control Application Creation>
4.8.5 Importance of Source
As described in Section 4.9.2, “Downloading Boot Project and Source,” a source is
actually a Logic Designer project compressed into zwt format and stored on the
flash memory.
Moreover, by a simple operation, a project can be restored on a PC by uploading the
source.
Whether a source is present on the flash memory does not directly affect control
operation on the FCN-500 or FCN-RTU but a source can be used as a backup copy
of the application.
A Case Story
A Logic Designer project created on a PC is normally backed up to a server or other
media for safekeeping. However, when the PC was damaged or replaced, it was
discovered that the backup copy was missing or may not be the most up-to-date,
making project recovery difficult.
In such unfortunate situations, if the source of the latest project had been
downloaded to the flash memory previously, restoring the Logic Designer application
would be easy.
While keeping a backup copy of a Logic Designer application on a server or other
media is basic, we also recommend saving the source on the flash memory just in
case.
Specifically, ticking the [Include Sources] checkbox as shown within blue box (1) in
the picture given in Section 4.9.3, “Detailed Description of Download Dialog” causes
the source to be downloaded at the same time as the project.
If it is not feasible to download the source at the same time as the project for some
reason, download the source of the latest control application subsequently using the
button enclosed by box (2) of the picture shown in Section 4.9.3.
Logic Designer R4.02.01 and later versions allow a project on a PC and a project on
a FCN-500 or FCN-RTU to be compared. For details, see 9.1.13, “Comparing Logic
Designer Projects.”
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