Mitsubishi L02CPU, User Manual, Page: 161 / 340

159
CHAPTER 3 CPU MODULE FUNCTIONS
3
3.
27
L
a
tc
h Dat
a
B
a
ckup t
o
St
andard RO
M
3.27
Latch Data Backup to Standard ROM
This function holds (backs up) latch data, such as device data and error history, to the standard ROM without using a
battery when the system is stopped for a long period. The stored data are restored when the system is restarted.
When this function is used, the battery life-prolonging function is enabled even if it is set to be disabled by the parameter.
The battery life-prolonging function is switched back to be disabled after executing this function (restoring stored data). The
setting status of the battery life-prolonging function can be checked by SD119.
(1) Backup data
The following shows data to be backed up.
(2) File size for storing backup data
The following shows the file size of data to be backed up.
*1 The size depends on the parameter setting.
*2 Storage files are created only when data in the file register, extended data register (D), and extended link register (W)
are backed up.
*3 Storage files are created only when the trace registration has been made.
Data to be backed up Description Remarks
Device data
• Internal user device (M, L, B, F, V, T, ST, C, D, W)
• Index Register(Z)/standard device register (Z)
• File register (R, ZR)
• Extended data register (D)
• Extended link register (W)
• The data of the file register, extended data register (D), and
extended link register (W) are backed up only when the file
register in the standard RAM is used.
• Select "Transfer to Standard ROM at Latch data backup
operation" on the PLC File tab of the PLC Parameter dialog
box.
Error history
Error history data immediately before the latch data
backup function to standard ROM function is
performed.
⎯
Module error collection file
Information on errors occurred in the connected
intelligent function modules The data are backed up independent of the setting of the
module error collection.
SFC program continuation start
information
Information to start the SFC program continuously
⎯
Trace Setting
(Sampling trace file) Trace condition settings and Trace data settings
created by the sampling trace function.
Data cannot be backed up in the following cases.
• Trace setting is made in a memory card.
• Trace setting is not registered with the CPU module.
Data to be backed up File size
Device data (Internal user device, index register/standard device register)
117462 bytes (When the default device assignment is set)
*1
Error history
Sampling trace information
Scan time measurement information
SFC program continuation start information
Module error collection file (stored in system memory.)
Module error collection file (stored in standard RAM.) 92+64 × Maximum number of module error collection file stored
Device data (file register, extended data register, extended link register)
*2
64 + 2 × Number of file register points
Trace setting (sampling trace file)
*3
16 + Sampling trace file size