6
FUNCTIONS
6.29 Latch Data Backup Function (to Standard ROM)
6 - 211
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(5) Restoring backup data
The data backuped is automatically stored by the following operations.
• At power-on (OFF to ON)
• At reset cancel
Whether to restore data after executing backup only once or to restore data per the
above-mentioned operations is set by SM676 (restore repetitive execution
specification) at the time of backup operation.
When restoring backup data is completed, BAT.LED of the CPU module flashes
(green) for five seconds.
POINT
If the number of device points set by the parameter setting and the device points
at the time of backup are different, RESTORE ERROR (error code: 2220) occurs
when restoring the backup data, and restoring data is not completed normally.
(Data will be restored when turning ON from OFF the power supply or canceling
the reset again in the next time.)
Execute any one of the following operations to complete restoring data normally.
• Return data at the time of parameter is backuped.
• Delete the backup data.
• Backup data again.
(6) Deleting backup data
The backup data is deleted by [Online] [Latch data backup operation] of GX
Developer. (Set the CPU to the STOP status, since data cannot be deleted in the
RUN status.)
Also, information of special registers (SD671 to SD675) can be initialized (cleared to
0) by deleting the backup data.
Table6.64 Status of SM676 and restore operation
Status of SM676 at backup operation Restore operation
Backup operation is performed when SM676 is OFF
Data is restored only once when the power supply is turned ON from
OFF or the reset is cancelled after backup operation execution.
Backup operation is performed when SM676 is ON
Data is restored per turning ON from OFF power supply or canceling
the reset. Data is restored repeatedly until the backup data is
deleted or the next latch data backup is performed.
Figure 6.128 Screen at deleting backup data
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