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MELSEC-Q
8 TROUBLESHOOTING
8.2.7 When a multiplexed remote I/O network for the redundant system does not operate
normally
(1) QnPRHCPU will not perform system switching even when the data
link cable is disconnected.
Check item Checking procedure
Isn’t the power supply module of the standby
system turned off?
Confirm the status of the external power supply of the standby system.
Hasn't a stop error occurred on the QnPRHCPU of
the standby system?
Connect GX Developer to the QnPRHCPU of the standby system and execute PLC
diagnostics to check if any error has occurred.
Hasn't a stop error occurred on the network
module mounted on the main base unit of the
standby system?
Confirm the operation status of the network module of the standby system.
(2) Errors on a remote I/O station cannot be detected by the PLC CPU
of the master operation station.
Check item Checking procedure
Hasn’t an error occurred on a remote I/O station of
function of version C or older?
Check the product information of the network module of the remote I/O station by the
system monitor of GX Developer.
(3) Cyclic data are turned off continuously or instantaneously when
system switching is performed on QnPRHCPU.
Check item Checking procedure
Is the send range of the host a tracking range?
Confirm if the devices in the send range of the host is set as tracking devices with the
parameters of GX Developer.
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