Automatic Backup Using Sd944 - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Automatic backup using SD944

Data in the CPU module can be automatically backed up at a preset execution timing. Set the execution timing of the
automatic backup with SD944 (Backup function setting). Multiple execution timing settings can be set.
Bit pattern of SD944
Bit 0: On
Bit 1: On
Bit 15: On
Since the special register set for the automatic backup is a latch area, setting data is held.
Retrying the automatic backup
Set whether to retry the automatic backup when the automatic backup is executed during execution of an operation or
function that cannot be executed ( Page 277 Operations and functions that cannot be performed).
The retry interval is three minutes and the number of retries is 10.
Special relay/Special register
SM961
SM1356
Bit 10 of SD944
The setting of the bit 10 of SD944 (Backup function setting) cannot be changed during execution of the automatic backup.
The retry setting of the automatic backup is enabled at the following timing.
• When the bit 0, bit 1, or bit 15 of SD944 turns on
Execution timing
On the time set in SD948 and SD949 on the day set in SD947
On the time set in SD950 and SD951 on the day of the week set to SD952
When a stop error has occurred in the CPU module
Description
This relay turns on when the retry of the automatic backup is completed with an error after the retry of the
automatic backup for the number of retries was attempted. This relay turns off at the start of the automatic
backup. (This relay does not turn off when SM1351 (CPU module data backup execution request) is on.)
• Off: Retry not executed/Retry being executed
• On: Retry failed
This relay turns on during execution of the retry of the automatic backup.
This relay turns on at the start of the retry of the automatic backup and turns off when the retry of the automatic
backup is started or the retry of the automatic backup for the number of retries is attempted without execution of
an operation or function that cannot be executed.
• Off: Retry is not being executed.
• On: Retry is being executed.
Set whether to retry the automatic backup.
• Off: Retry is not executed.
• On: Retry is executed.
15 CPU MODULE DATA BACKUP/RESTORATION FUNCTION
273
15.1 Backup Function
15