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Unity Pro error: "CSA has been downloaded into PLC, execution has failed. On-line modifications error"

The error above is displayed after an online edit and build.

This is caused by an LD section being too large.  Usually, it is a section that contains more than 200 rungs.
Examine each LD section in the project.  If a section contains more than 200 rungs, break it into two sections.

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