37 FUNCTIONS
37.3 Memory Copy from Control System to Standby System
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37
Execution method of memory copy
The following methods are available for memory copy.
■Check method using the special relay/special register
The execution status and completion status of memory copy can be checked using the following special relay/special register
areas.
*1 Even after the CPU module is turned off and on or reset, the result of the memory copy executed just before this reset operation can be
checked because this register area is a latch area.
For details on each special relay and special register area, refer to the following.
Page 803 List of Special Relay Areas, Page 833 List of Special Register Areas
Execution of memory copy
The memory copy can be executed regardless of the operating statuses (RUN/STOP/PAUSE, stop error) of the control
system and standby system CPU modules. However, execution availability differs depending on the safety operation mode.
: Can be executed, : Cannot be executed
Item Description Reference
Memory copy with the engineering tool Executes the memory copy with an online operation of the
engineering tool that is connected to the standby system CPU
module.
Page 640 Memory copy with the engineering
tool
SM/SD number Name
SM1654 Memory copy being executed
SM1655 Memory copy completion
SD988
*1
Memory copy completion status (latch)
SD1654 Memory copy completion status
Safety operation mode of each system Execution availability
Control system Standby system
TEST MODE TEST MODE
SAFETY MODE
SAFETY MODE TEST MODE
SAFETY MODE
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