37 FUNCTIONS
37.3 Memory Copy from Control System to Standby System
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Precautions
The following describes precautions on the memory copy function.
Automatic memory initialization
The initialization operation for each memory differs.
When the memory copy is executed, the ERROR LED of the standby system CPU module may flash. This phenomenon is not
an error.
*1
*1 When a stop error has been occurred in the standby system, no error is detected.
Follow the procedure to turn off and on or reset the standby system CPU module.
Also, back up the data that is not supported by the memory copy and is stored in the "$MELPRJ$" folder, such as event
history, before executing the memory copy.
Restrictions
■Restrictions on memory copy execution
Do not execute the memory copy in the following cases.
• The standby system CPU module is off or being reset.
• During initial processing (when switched to RUN)
• The tracking cable has an error or is pulled out.
• An error occurs on a redundant function module.
• A system configuration in which communications via a redundant function module are unavailable is used.
• Different models of CPU module are used in the control system and standby system.
• An online operation is performed from the engineering tool.
• The systems are being switched.
• An online module change is being performed (for replacing a redundant function module or modules of the standby
system).
• The memory copy has been executed on the standby system.
• The safety operation mode of the standby system is SAFETY MODE.
• Memory copy cannot be executed with the access level of the operator. (It is executed by a user other than an
Administrator.)
• A communication timeout occurs in tracking communications.
■Restrictions during memory copy execution
Do not execute the following functions during memory copy execution.
• Online operation from the engineering tool
• Operation of the RUN/STOP/RESET switch
• Removal of the SD memory card
• Online module change
• Powering off or resetting the CPU modules
• Removal of tracking cables
Memory Initialization operation
Program memory, device/label memory Regardless of whether or not there are differences, execute the memory copy after the memory is initialized.
Data memory Regardless of whether or not there are differences, the "$MELPRJ$" folder is deleted from the memory and
then the memory copy is executed.
SD memory card If there are differences, the "$MELPRJ$" folder is deleted from the SD memory card and then the memory
copy is executed.
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