Mitsubishi Electric Melsec Q Series User Manual page 294

9
TROUBLESHOOTING
Turn the maintenance-completed system (standby system CPU)
to RUN.
Connect the PROFIBUS cable to the standby system QJ71PB92V.
Connect GX Works2 to the control system CPU.
Perform maintenance of the other system
Is the operation mode different between
the QJ71PB92Vs in the control
and standby systems?
On the Redundant operation screen of GX Works2, select Backup
mode for Operation mode of the redundant CPU.
9
- 12 9.4 Troubleshooting in the Redundant System
9.4.3 Maintenance of the QJ71PB92V in the standby system
1)
(control system)?
No
No
*2
Completed
Figure 9.7 Maintenance of the QJ71PB92V in the Standby System (Continued)
* 1 For how to change the operation mode and how to switch systems in a redundant system, refer to
the user's manual for the redundant system for the CPU module used.
* 2 When changing the mode from Separate to Backup, use the same communication pathway as the
one used when Backup mode was changed to Separate mode. (
redundant system for the CPU module used)
POINT
The following maintenance must be performed on both QJ71PB92Vs in the
control and standby systems.
• Sequence program modification
• Parameter modification in GX Configurator-DP or GX Works2
• Operation mode change of the QJ71PB92V
Execute system switching from GX Works2.
1. Turn ON the manual switching enable flag (SM1592)
Yes
of the control system CPU.
2. On the Redundant operation screen of GX Works2,
make a system switching request to the control
system CPU.
Perform maintenance of the other system (control
Yes
system), and place the QJ71PB92Vs in the control and
standby systems in the same operation mode.
(To the previous page)
2)
*1
User's manual for the