Memory Copy Function From Control System To Standby System - Mitsubishi Electric MELSEC iQ-R Series User Manual

Memory copy function from control system to standby system

This function transfers data such as parameters of the remote head module of control system to the remote head module of
standby system to match the remote head module of the control system.
Memory copy is not executed from the standby system to the control system. Also, when memory copy is completed
successfully, the event history is stored in the remote head module.
Files copied by the memory copy function
The memory copy function copies files required for starting a redundant system.
The following table lists the files to be copied by the memory copy function.
: Memory copy possible, : Memory copy not possible, : Storage not possible
File type
CPU parameter
System parameter
Module parameter
Module extension parameter
Device comment
Global label setting file
Initial label value file
Event history
Device data storage file
General-purpose data
Remote password
When the memory copy is executed, files are copied after the memory of the remote head module of the
standby system that has differences is initialized.
The memory copy cannot be executed to the files such as event history and those files are deleted from the
memory of the standby system remote head module. Back up the files before executing the memory copy as
required.
Execution method of memory copy
When a file mismatch is detected by system consistency check in any of the following timings, memory copy is automatically
executed.
• Power-on (Irrespective of the system status when the system started previously, memory copy from remote head No.1 to
remote head No.2 is performed.)
• Reset clear of remote head module of the control system or standby system
• Replacement of remote head module of the standby system
Execution conditions of memory copy
The memory copy function can be executed irrespective of the operating status of the remote head module of the control
system and standby system.
However, memory copy is not executed in the following cases.
• When memory is being formatted
• When data is being written to the remote head module of control system
Initial global label value file
Copy
Remote head module built-in memory
Device/label memory











Data memory











1 FUNCTIONS
1.8 Redundant Function
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