xvii
Data Backup
6
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
capacitor.
The data backed up by the capacitor will become unstable or corrupted if the
backup time is exceeded.
6-2
User Programming
If the power supply is turned OFF for longer than the data backup time (10
days at 25
°
C), the data in the DM Area, EM Area, and Error Log, as well as
counter present values, will be lost and any data that is read will be unstable.
If the power supply is to be turned OFF for an extended period of time, the
contents of DM 0000 to DM 6143 can be backed up in flash memory. The
Backup Data Corrupted Flag (SR 24914) can also be used as shown below to
detect when backup data (i.e., data in the DM Area, EM Area, and Error Log,
as well as counter present values) has become corrupted to perform appropri-
ate error processing.
DM 0000 to DM 6143 (read/write portion of DM Area) can be backed up in
flash memory by the user as described in the next section.
Backup time
Ambient temperature
25
°
C
40
°
C
75
°
C
1st day
5th day
10th day
24914
Processing for
corruption of data
backed up for
power interruptions
Summary of Contents for CS1W-HCA12-V1
Page 2: ......
Page 6: ...vi...
Page 20: ...xx Conformance to EC Directives 7...
Page 38: ...18 Models and System Configurations Section 1 2...
Page 78: ...58 Fail safe Circuits Section 3 5...
Page 138: ...118 AR Area Section 6 4...
Page 204: ...184 Improved Instructions Section 7 14...
Page 222: ...202 Cycle Time Section 8 3...
Page 240: ...220 Troubleshooting Flowcharts Section 9 5...
Page 244: ...224 Precautions when Using the CX Programmer Appendix A...
Page 252: ......
Page 253: ......