Mitsubishi Electric MELSEC iQ-R Series User Manual page 62

Operations when memory copy is executed
The operations when memory copy is executed is explained using an example when power is turned off and on.
1.
Powering off and on the system.
2.
When a file mismatch is detected by system consistency check, the ERR LED of the standby system flashes. Also, the
CTRL LED of the control system flashes to indicate the system switching disable state.
3.
The SBY LED of the standby system flashes, and memory copy automatically starts.
4.
After the memory copy operation is completed successfully, the standby system is automatically reset.
When the memory copy operation fails, the standby system will not be reset.
The SBY LED of the standby system turns off to indicate that the memory copy operation has been completed with an error.
Also, the CTRL LED of the control system flashes to indicate the system switching disable state.
5.
After the standby system restarts, the CTRL LED of the control system and the SBY LED of the standby system turn on.
Precautions
When an error occurs while memory copy is being executed, the remote head module of the standby system will not perform
memory copy correctly, and that leads to a moderate error.
While memory copy is being executed, the following operations cannot be performed from the engineering tool for the remote
head module of the control system or the standby system.
• CPU memory operation
• Writing data to the programmable controller
• Deleting data from the programmable controller
• System switching
1 FUNCTIONS
60
1.8 Redundant Function