Mitsubishi Electric L26CPU-BT User Manual page 4

[Design Precautions]
● For the operating status of each station after a communication failure, refer to Page 136, Section 8.2.6
in this manual.
Incorrect output or malfunction due to a communication failure may result in an accident.
● When connecting a peripheral with the CPU module or connecting an external device, such as a
personal computer, with an intelligent function module to modify data of a running programmable
controller, configure an interlock circuit in the program to ensure that the entire system will always
operate safely.
For other forms of control (such as program modification or operating status change) of a running
programmable controller, read the relevant manuals carefully and ensure that the operation is safe
before proceeding.
Especially, when a remote programmable controller is controlled by an external device, immediate
action cannot be taken if a problem occurs in the programmable controller due to a communication
failure.
To prevent this, configure an interlock circuit in the program, and determine corrective actions to be
taken between the external device and CPU module in case of a communication failure.
● Do not write any data to the "system area" of the buffer memory in the intelligent function module.
Also, do not use any "use prohibited" signals as an output signal from the CPU module to the
intelligent function module.
Doing so may cause malfunction of the programmable controller system.
● To set the auto refresh parameter, select the device Y for the remote output (RY) refresh device. If a
device other than Y, such as M and L, is selected, the CPU module holds the device status even after
its status is changed to STOP.
For how to stop a data link, refer to Page 186, Section 8.3.8.
● If a CC-Link dedicated cable is disconnected, the network may be unstable, resulting in a
communication failure of multiple stations.
Configure an interlock circuit in the program to ensure that the entire system will always operate
safely even if communications fail.
Failure to do so may result in an accident due to an incorrect output or malfunction.
[Design Precautions]
● Do not install the control lines or communication cables together with the main circuit lines or power
cables.
Keep a distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise.
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WARNING
CAUTION