Mitsubishi MELSEC Q Series Handbook page 4

[Design Precautions]
● For the operation status of each station at communication error in each station, refer to the
respective manual for each station.
The communication error may result in an accident due to incorrect output or malfunction.
● 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.
● When using the notification function, the pager receiver may not be contacted due to the frequency
transmission status from the system setup environment and error on the receiver side.
To ensure the safety of the programmable controller system, install a call circuit with a lamp display
or buzzer sound.
● 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.
● When performing the control of the programmable controller in operation (changing data) by
connecting a peripheral devices to the CPU module or personal computer, etc. to the intelligent
device module, configure an interlock circuit in a sequence program so the safety of the overall
system is always maintained.
Also when performing other controls of the programmable controller in operation (changing program
and operation status (status control)), read this manual carefully and confirm if the overall safety is
maintained.
Especially, when this control is performed to a remote programmable controller from an external
device, troubles that have occurred on the programmable controller side may not be able to
immediately be handled if there is a data communication error.
Define a troubleshooting agreement between external devices and the programmable controller
CPU for data communication error occurrences, as well as construct an interlock circuit in the
sequence program.
● When connecting a peripheral device to the CPU module or performing control of a programmable
controller which is being run through a BASIC program, configure an interlock circuit in the sequence
program so that the system overall is operating on the safe side at all times. Also before exercising
other control (program change, operating status change (status control)) on the running
programmable controller, read the manual carefully and fully confirm safety. Especially for the above
control on the remote programmable controller from, an immediate action may not be taken for
programmable controller trouble due to a data communication fault. In addition to configuring up the
interlock circuit in the sequence program, corrective and other actions to be taken as a system for
the occurrence of a data communication fault should be predetermined between and programmable
controller CPU.
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WARNING