Auto Memory Copy - Mitsubishi Electric MELSEC iQ-R Series User Manual

Execution methods
There are three methods for executing the memory copy.
Item

Auto memory copy

Memory copy using the
engineering tool
Memory copy using the special
relay and special register
Execution conditions
The memory copy can be executed regardless of the operating status (RUN, STOP, PAUSE, stop error) of the CPU module in
both control and standby systems.
The auto memory copy can be executed only when the redundant system is in backup mode.
Auto memory copy
The execution procedure for the auto memory copy is described below.
The auto memory copy is executed when the standby system is powered off and on or reset while the control system is
operating.
• The auto memory copy needs to be set in the CPU parameter in advance. For this reason, consider whether
to use the auto memory copy or not when determining the maintenance policy in the system design phase.
• The auto memory copy is executed when the parameter has been set for the CPU module of the control
system. Even when the parameter has not been set for the CPU module of the standby system, the auto
memory copy is executed when the parameter has been set for the CPU module of the control system.
Parameter
To execute the auto memory copy, set "Auto Memory Copy Setting" to "Enable" in the CPU parameter.
[CPU Parameter]  [Redundant System Settings]  [Redundant Behavior Setting]
Window
Displayed items
Item
Auto Memory Copy Setting
• When the control system and the standby system are simultaneously powered on, the auto memory copy is
not executed.
• The CPU module of the standby system does not perform boot operation using an SD memory card, but
operates based on the files copied by the auto memory copy. However, when the auto memory copy cannot
be executed due to a communication error or other causes at power-on or reset of the standby system, the
CPU module of the standby system operates with the files transferred by the boot operation.
Description
The system automatically executes the memory copy. CPU
parameter settings are required in advance.
The memory copy is executed by an online operation of the
engineering tool connected to the CPU module of the control
system.
The memory copy is executed by operations of the special relay
and special register.
Description
Set whether to enable the auto memory copy function or not.
Application
For executing the memory copy without using an
engineering tool or an external device (such as a GOT)
For executing the memory copy using the engineering
tool
For executing the memory copy using an external
device (such as a GOT)
Setting range
• Disable
• Enable
26 REDUNDANT FUNCTION
26.4 Memory Copy from Control System to Standby System
26
Default
Disable
407