When The Cpu Module "Backup" Led Is On (Red) - Mitsubishi Q12PRHCPU User Manual

8
TROUBLESHOOTING

8.1.2 When the CPU Module "BACKUP" LED is ON (Red)

The following flow (Diagram 8.4) is for the case where the "BACKUP" LED of the CPU
module is on (red) while the redundant system is running.
The "BACKUP" LED is lit up solid red
8
- 5 8.1 Troubleshooting Flow
8.1.2 When the CPU Module "BACKUP" LED is ON (Red)
Is the standby
NO
system's power
turned ON?
YES
Has standby
NO
system's CPU
module reset been
canceled?
Is the standby
YES
system CPU
module "ERR." LED
flashing?
NO
1)
Turn ON the standby system power
Clearing control system CPU
Section 8.2
module errors (
Is the "BACKUP"
NO
LED lit up solid
green?
Cancel the standby system's
CPU module reset
Clearing control system CPU
Section 8.2
module errors (
Is the "BACKUP"
NO
LED lit up solid
green?
Connect GX Developer to the standby
system CPU module and check for
faulty behavior using the System
Monitor / PLC diagnostics. *2
Correct abnormal behavior of the
standby system's CPU module
Clearing control system CPU
Section 8.2
module errors (
Is the "BACKUP"
NO
LED lit up solid
green?
)
YES
)
YES
)
YES
Completed