16-9
16 Other Functions
CP2E CPU Unit Software User’s Manual(W614)
16-3 DM Backup Function
16
16-3-1 Backing Up and Restoring DM Area Data
16-3 DM Backup Function
This section describes the function that saves specified words from the DM Area in the built-in Flash
Memory.
The contents of the DM Area (D) can be saved when the user needs it. The contents of the specified
words in the DM Area data can be backed up from I/O memory to the built-in Flash Memory during
operation by turning ON a bit in the Auxiliary Area. The number of DM Area words to back up is speci-
fied in the Number of CH of DM for backup Box in the PLC Setup. If the Restore D0- from backup mem-
ory Check Box is selected in the PLC Setup, the backup data will automatically be restored to I/O
memory when the power is turned back ON so that data is not lost even if power is interrupted.
z Conditions for Executing Backup
Specified words starting from D0 in the I/O memory can be saved to the built-in Flash Memory by
turning ON A751.15. (These words are called the DM backup words and the data is called the DM
backup data.) A751.15 (DM Backup Save Start Bit) can be used in any operating mode (RUN, MON-
ITOR, or PROGRAM mode).
z Words that can be Backed Up
• E-type CPU Units: D0 to D1499
• S-type CPU Units: D0 to D6999
• N-type CPU Units: D0 to D14999
16-3-1 Backing Up and Restoring DM Area Data
Overview
CP2E CPU Unit
A751.15 (DM Backup Save Start Bit) turned ON.
I/O Memory
DM Area (D)
Specified number
of words
DM backup data
Data
backed up.
Data
restored.
Built-in Flash
Memory
~
D0
D (n-1)
Specify the number of words
starting from D0 in the
Number of CH of DM for
backup Box in the Startup
Data Read Area in PLC
Setup.
DM backup data is restored to the I/O memory when power supply is
turned ON again if the Restore D0- from backup memory Check Box is
selected in the Startup Data Read Area in the PLC Setup.
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