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6.28 Latch Data Backup to Standard ROM Function
(1) Definition
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. This function helps to extend battery life.
Remark
When this function is performed, the battery life-prolonging function is enabled regardless of the parameter setting for the
battery life-prolonging function.
Also, the battery life-prolonging function is switched to be disabled after backup data are restored.
The setting status of the battery life-prolonging function can be checked by SD119 (battery life-prolonging factor).
For details of the battery life-prolonging function, refer to Section 6.26.
(2) Data to be backed up
Table6.45 shows data to be backed up.
Data to be backed up
Device data
Error history
SFC program continuation start
information
Trace setting
(Sampling trace file)
*1: The data are backed up only when the Universal model QCPU having the serial number (first five digits) is "10042" or later is used.
Table6.45 Data to be backed up
Description
• Internal user device (M, L, B, F, V, T, ST,
C, D, W)
• Index register (Z)/standard device
register (Z)
• File register (R, ZR)
*1
• Extended data register (D)
*1
• Extended link register (W)
Error history data immediately before the
latch data backup function to standard
ROM function is performed
Information to start the SFC program
continuously
Trace condition settings and Trace data
settings created by the sampling trace
function.
CHAPTER6 FUNCTIONS
Remarks
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
-
-
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.
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