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6.29 Latch Data Backup Function (to Standard ROM)
6
FUNCTIONS
6.29 Latch Data Backup Function (to Standard ROM)
(1) Definition of latch data backup function (to standard ROM)
Latch data backup function (to standard ROM) is a function to hold (backup) latch
data such as device data or error history without using a battery when stopping the
system for a long period. This function enables to prolong the life of battery.
Remark
When executing the latch data backup function (to standard ROM), the battery
life-prolonging function is enabled regardless of parameter setting of the battery
life-prolonging function.
Also, the battery life-prolonging function is switched to be disabled after restoring
backup data.
The battery life-prolonging function enabled/disabled status can be checked by
SD119 (battery life-prolonging function enabled/disabled).
For the battery life-prolonging function, refer to Section 6.27.
(2) Data to be backuped
Data that needs to be backuped is shown in Table 6.56.
* 1: The data of the extended data register (D) and extended link register (W) are backed up only
when the Universal model QCPU whose serial number (first five digits) is "10042" or later is used.
Note92
Table6.62 List of data to be backuped
Data to be backuped
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 information
immediately before latch data
backup to the standard ROM
-----
SFC program continuation start
information
Information to start the SFC
program continuously
-----
Trace setting
(Sampling trace file)
Trace condition settings and
Trace setting created by sampling
trace function
Backup cannot be made in the following
cases.
• Trace setting is set in a memory card.
• Trace setting is not registered in the
CPU module.
Note92
Basic
High
Performance
Process
Note6.90
Note6.90
Note6.90
Note6.90
Redundant
The Basic model QCPU, High performance model QCPU, Process CPU, and Redundant CPU
do not support the latch data backup function to the standard ROM.
Basic
High
Performance
Process
Redundant
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