Latch Data Backup To Standard Rom - Mitsubishi Electric L02SCPU User's Manual And Reference

3.28

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
status (enabled/disabled) of the battery life-prolonging function can be checked with SD119 (battery life-prolonging factor).
For details on the battery life-prolonging function, refer to  Page 198, Section 3.33.
(1) Backup target data and file size
The following table lists backup target data and sizes of files where data are stored.
Backup target data
Device data
Error history
File transfer error history
SFC program continuation start information
*2
Module error collection
*3
Trace setting (Sampling trace file)
*1 To backup the data, check the "Transfer to Standard ROM at Latch data backup operation" checkbox on the PLC file tab.
*2 Regardless of the setting of the module error collection function, data is backed up.
*3 A storage file is created only when the trace registration has been made. The data are not backed up when trace
settings are not written to the CPU module.
*4 These are sizes when the device assignment is default. Sizes differ depending on parameter settings.
(a) File size
CPU module
L02SCPU, L02SCPU-P
L02CPU, L02CPU-P
L06CPU, L06CPU-P
L26CPU, L26CPU-P, L26CPU-BT,
L26CPU-PBT
Data description
*1
• File register (R, ZR)
*1
• Extended data register (D)
*1
• Extended link register (W)
• Internal user device (M, L, B, F, V, T, ST, C, D, W)
• Index register (Z)/standard device register (Z)
• Error history information immediately before latch data backup to
the standard ROM
Information on errors of the data logging file transfer function
Information for starting the SFC program continuously
Information on errors that has occurred in the intelligent function
module (module error collection function)
Trace condition settings and trace data settings created by the
sampling trace function
Serial number (first five digits)
15101 or earlier
15102 or later
12111 or earlier
12112 or later
14112 or later
15102 or later

15102 or later
12111 or earlier
12112 or later
14112 or later
15102 or later
CHAPTER 3 CPU MODULE FUNCTIONS
File size (byte)
64 + 2 x Number of file register points
File sizes differ depending on the CPU
*4
module used. ( Page 175,
Section 3.28 (1) (a))
92 + 64 x Maximum number of module
errors
16 + Sampling trace file size
File size (byte)
93702
93710
93802
99098
106702
106710
130382
130390
117482
122778
130382
130390
3
175