22 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
22.1 Backup Function
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Backup during execution of the backup processing
The backup processing triggered by turning on SM1351 or automatic backup cannot be executed during execution of the
backup processing. (The latter backup processing is ignored.)
When the data is written to the programmable controller after rebuilt all (reassignment)
When the data is written to the programmable controller after rebuilt all (reassignment), power off and on or reset the
programmable controller and execute backup processing.
In redundant mode
The following describes the precautions for the backup function in redundant mode.
■Function that cannot be executed simultaneously with backup function
If the backup function is executed in the state that the following function is executed, the backup function is completed with an
error.
• System A and system B setting
• Memory copy from control system to standby system
When Retry execution for the automatic backup (bit 10 of SD944 (Backup function setting)) is set to on, retry the automatic
backup. When the automatic backup cannot be executed due to the above functions operating even after the specified
number of retries are attempted, the automatic backup is completed with an error.
When the above functions are executed during backup, errors in them are detected.
■Backup execution request
The tracking transfer does not cover SM1351 (CPU module data backup execution request). To perform the backup by turning
on SM1351, turn on SM1351 both in the control system and standby system before executing a backup.
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