Filter
Top Products
CHAPTER6 FUNCTIONS
1
2
3
4
5
6
7
8
6.28 Latch Data Backup to Standard ROM Function
6 - 141
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.
*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
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)
*1
• Extended link register (W)
*1
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
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.