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6.29 Latch Data Backup Function (to Standard ROM)
6
FUNCTIONS
(4) Execution method
(a) Execution by contact
1) Setting method
Set the start contact of the latch data backup to standard ROM by the PLC
system setting of PLC parameter. (Device applicable for contact is X, M, or B.)
2) Execution method
Backup is started by starting up contacts (OFF to ON).
When backup is completed, BAT.LED of the CPU module flashes (green),
which is status where power supply is ready to be turned OFF.
3) Precautions
a) Since data to be backuped is data at the time when contact is ON (at END
processing), turn ON power supply again or cancel the reset after execution
of this operation.
b) The status of start contact of latch data backup to the standard ROM is
checked at the END instruction execution, backup is not made even if a
contact is switched ON
OFF ON or OFF ON OFF in one scan
processing.
c) In the following cases, backup is not started unless start contact of the latch
data backup to standard ROM is turned OFF and turned ON again.
• Start contact of the latch data backup to the standard ROM is set to X, and
the power supply is turned ON from OFF without turning OFF contact or
cancel the reset after executing backup by turning ON from OFF the
contact.
• Start contact of the latch data backup to the standard ROM is set to M or
B, and backup is performed by turning ON from OFF the contact.
(b) Execution by remote operation
1) Execution method
Backup of latch data to the standard ROM can be operated by [Online]
[Latch data backup operation] of GX Developer.
When backup is completed, BAT.LED of the CPU module flashes (green),
which is status where power supply is ready to be turned OFF.
Data to be backuped is data at the time of remote operation.
Figure 6.126 Setting screen of start contact of latch data backup to standard ROM
Figure 6.127 Remote operation execution screen
Specify a contact
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