
166
3.30
CPU Module Change Function with SD Memory Card
This function enables to pass data from a module to be changed (disconnected) to the newly-connected CPU module.
By using this function, control can be continued after replacing a CPU module. To pass data, backup the data to an SD
memory card before replacing a CPU module, and restore them in the newly-connected CPU module before replacing
a CPU module.
(1) Backup data file
Only one backup data file can be stored to an SD memory card. If any backup data file exists in the SD memory
card, the file data are overwritten.
To delete the backup data file, select "Delete PLC Data..." of a programming tool.
(2) Backup data
(a) Backup data selection
Select a drive to back up from the following table.
*1
Data in the program cache memory are backed up.
*2
Latch devices or devices set in the latch range are backed up.
Backup data (drive)
Description
Backup by user
Program memory (drive 0)
All data in the program memory (drive 0)
*1
Allowed
Standard RAM (drive 3)
All data in the program memory (drive 3)
Standard ROM (drive 4)
All data in the program memory (drive 4)
Device data
*2
Internal user device (L, B, F, V, T, ST, C, D, W)
Not allowed (backed up by the system)
System data
Data managed by the system (such as module error history)
Programming tool
Standard RAM
Standard RAM
SD memory card for storing backup data
2) Change the CPU
module.
3) Restore the backup
data.
1) Back up data to
an SD memory card.
LCPU
Program memory
Device data
System data
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