28 FUNCTIONS
28.5 System Consistency Check
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28
File
Whether both systems have the same files is checked.
The following table shows whether or not to perform the check on each file type.
: Checked, : Not checked, : Storage not possible
*1 The reserved area for online change and program restoration information write status are also checked. ( Page 106 Configuration of
a program file, Page 942 Program Restoration Information Write Selection)
*2 Whether a file is stored or not is checked. The file contents are not checked.
*3 The file will not be checked at the timing on when SD memory cards are inserted during operation.
Operation of when a mismatch is detected
If a mismatch between the files is detected, a stop error occurs on the standby system CPU module.
Set the CPU modules of both systems to have the same files with either of the following methods.
• Writing files to both systems
• Executing the memory copy from the control system to the standby system for storing the same files in both systems (
Page 468 Memory Copy from Control System to Standby System)
File type Check target memory
Built-in memory of CPU
module
SD memory card
*3
Program
*1
FB file
*1
CPU parameter
System parameter
Module parameter
Module extension parameter
Module-specific backup parameter
Memory card parameter
Device comment
Initial device value
Global label setting file
Initial label value file Initial global label value file
Initial local label value file
File register
*2
Event history
Device data storage file
General-purpose data
Data logging setting file Common setting file
Individual setting file
Remote password
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