Mitsubishi Electric Melsec Q Series User Manual page 293

9
TROUBLESHOOTING
Start
Connect GX Works2 to the control system CPU.
On the Redundant operation screen of GX Works2, select Separate
mode for Operation mode of the redundant CPU.
Stop the system for which maintenance is to be performed (standby
system CPU).
Disconnect the PROFIBUS cable connected to the QJ71PB92V in the
standby system.
Connect GX Works2 to the standby system CPU.
Set the operation mode of the standby system CPU to Debug mode.
1. In Debug mode setting for operation mode setting of Redundant
parameter in GX Works2, select "Start with Debug mode".
2. Write the set redundant parameters to the standby system CPU.
3. Reset the standby system CPU, or power OFF→ON the standby
system.
Perform maintenance of the standby system.
Maintenance Maintenance
• Sequence program modification
• Parameter change in GX Configurator-DP or GX Works2
• Change of QJ71PB92V operation mode
• Recovery from error
• Powering OFF and then ON
• Resetting redundant CPU
• Replacement of QJ71PB92V
Return the operation mode of the standby system CPU to Separate
*1
mode.
1. In Debug mode setting in Redundant parameter of GX Works2,
select "Do not start with Debug mode".
2. Write the set redundant parameters to the standby system CPU.
3. Reset the standby system CPU, or power OFF
system.
1)
(To the next page)
Figure 9.9 Maintenance of the QJ71PB92V in the Standby System
9.4 Troubleshooting in the Redundant System
9.4.3 Maintenance of the QJ71PB92V in the standby system
*1
*1
ON the standby
2)
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