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[Designing Precautions]
!
DANGER
• For data change, program change and status control to be performed for the running
programmable logic controller from a personal computer, configure interlock circuits in the
outside of the PLC system so that the whole system will always operate safely.
Also, for online operations to be performed from the personal computer to the PLC CPU,
predetermine as a system the corrective actions for communication errors that will occur due to
poor cable connection, etc.

[Startup/Maintenance Precautions]
!
CAUTION
• Before performing online operations (program change during PLC CPU RUN, forced I/O
operation, RUN-STOP or similar operating condition change, remote operation) with the
personal computer connected to the running PLC CPU, read the manual carefully and ensure
safety fully.
Note that program change during PLC CPU RUN (online change) may cause such problems as
program corruption depending on the operation condition. Use the equipment after fully
understanding the precautions given in the GX Developer Operating Manual.