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6
Data Backup
xvi
6
Data Backup
6-1
Automatic Backup
Data in the Customizable Counter Units is backed up either by a super capacitor
or flash memory, as listed in the following table.
Data
Data backup
DM Area (DM 0000 to DM 6143), EM Area (EM 0000
to EM 2047), error log (DM 6144 to DM 6199), and
counter present values.
A setting is provided to either enable or disable
holding EM Area data. The default is to not hold the
data.
RAM with super capacitor
User program, read-only DM Area words (DM 6200
to DM 6599), Unit Setup Area (DM 6600 to DM
6655), expansion instructions information, read/write
DM Area words (DM 0000 to DM 6143, see note.)
Flash memory
Note The contents of DM 0000 to DM 6143 are written to flash memory only when
SR 25200 (DM Area Backup Bit) is turned ON.
The data in RAM is backed up by the super capacitor for 10 days at 25
°
C. The
backup time varies with the ambient temperature as shown in the following
graph.
Backup time
Ambient temperature
25
°
C
40
°
C
75
°
C
1st day
5th day
10th day
Note The times give above assume that the capacitor is completely charged. Power
must be supply to the Unit for at least 15 minutes to completely charge the ca-
pacitor.
The data backed up by the capacitor will become unstable or corrupted if the
backup time is exceeded.
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