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CHAPTER 3 FUNCTIONS
3
3.32 CPU Module Data Backup/restoration Function
3.32.1 Backup function
(2) Backup by turning on SM1926
This relay backs up data of a CPU module in a desired timing.
(a) Operating procedure
Back up data by turning on SM1926.
1. To specify the upper limit value of the number of backup data, set the value with the following
procedure
For the upper limit value of the number of backup data, refer to the following.
Page 281, Section 3.32.1 (1)
2. Turn off and on SM1926 (Backup execution request).
If a backup is completed with an error and SM916 (Backup error check flag) turns on, check SD916 (Cause of
error occurred during backup), take corrective action, and then backup again as necessary.
• Progression status of backup can be checked in SD1925 (Number of backup/restoration uncompleted files) and
SD1926 (Backup/restoration progression status). ( Page 280, Section 3.32 (3))
• Set SD1928 (Upper limit value setting for the number of backup data).
• Set SM923 (Upper limit setting flag for the number of backup data).
• Turn on bit5 of SD910 (Backup function setting).
(1) Backup execution requested
(2) Turning on SM1925 (Backup execution status flag) by the system
(3) Turning off SM1926 after completion of backup by the system
(4) Turning off SM1925 by the system
ON
SM1926
OFF
END END END END ENDEND ENDEND END
ON
OFF
(1)
(3)
(2)
(4)
SM1925
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