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3.32.1
Backup function
This function backs up data such as program files, a parameter file, and device data including the file register in a CPU
module to an SD memory card.
The backup function is performed even while the CPU module is in RUN state.
When executing the backup function during RUN, do not make the device data change during the execution. (
286, Section 3.32.1 (5) (c))
(1) Upper limit value setting for the number of backup data
The upper limit value of the number of backup data and the operation when the number of backup data reaches
the upper limit can be set
(Backup_CPU) exists in the SD memory card used.) As for the upper limit value setting, the number of backup
data represents the number of date stamp folders.
To enable the upper limit value of the backup data and the operation when the number of backup data reaches
the upper limit, specify the value in SD1928 (Upper limit value setting for the number of backup data) and SM923
(Upper limit setting flag for the number of backup data), and then turn on bit5 (Upper limit status setting for the
number of backup data) of SD910. The value specified can be checked in SD923 (Upper limit value status for the
number backup data). Turning off bit5 of SD910 disables the upper limit value setting.
Special relay/special register
SM923
Bit5 of SD910
SD923
SD1928
*1
For the modules whose serial number (first five digits) is "18052" or earlier, this setting cannot be used. (The upper limit
value of the number of backup data is the maximum capacity of an SD memory card.)
Regardless of the upper limit value set, the backup will complete with an error if the number of backup data exceeds the
capacity of an SD memory card.
*1
when a backup function has not been executed yet. (No backup data folder
Specify the operation when the number of backup data reaches the upper limit value with this
relay. (This relay is valid only when bit5 of SD910 is on.)
• Off: After the oldest date stamp folder is deleted, the backup processing is continued.
• On: The backup processing is not continued if the number of backup data exceeds the upper
limit value. (if the processing is continued, the backup will complete with an error.)
Set whether to enable or disable the upper limit value setting for the number of backup data with
this bit.
• Off: Disable (No upper limit (As many date stamp folders are created as the capacity of an SD
memory card.))
• On: Enable
This register indicates the value (1 to 100) that is set to SD1928. If bit5 of SD910 is off, 0 is stored.
Set the upper limit value (1 to 100) of the number of backup data with this register.
CHAPTER 3 FUNCTIONS
Description
3
Page
281
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