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• For the operating status of each station after a communication failure, refer to relevant manuals
for the network. Erroneous outputs and malfunctions may lead to accidents.
Not doing so can cause an accident due to false output or malfunction.
• To prevent the malfunction of the programmable controller system due to harmful e-mails, take
preventive measures (such as antivirus measures) so that the mail server for this module does
not receive harmful e-mails.
• To maintain the safety of the programmable controller system against unauthorized access from
external devices via the Internet, take appropriate measures.
• When changing data of the running programmable controller from a peripheral connected to the
CPU module or from a personal computer connected to an intelligent function module or special
function module, configure an interlock circuit in the sequence program to ensure that the entire
system will always operate safely. For program modification and operating status change, read
relevant manuals carefully and ensure the safety before operation.
Especially in the above mentioned control operations that are performed from an external device
to a remote programmable controller, any problems on the programmable controller side may
not be dealt with promptly due to abnormal data communication. To prevent this, configure an
interlock circuit in the sequence program, and determine corrective actions to be taken between
the external device and CPU module in case of a communication failure.