Mitsubishi Electric MELSEC iQ-R Series - Files

26 REDUNDANT FUNCTION
26.5 System Consistency Check
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Files
Whether files are the same between the control system and the standby system 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 the program restoration information write status are also checked. ( Page 156
Configuration of a program file, Page 741 Program Restoration Information Write Selection)
The SFC information device setting and the operation mode when an active block is activated ("Act at Block Multi-Activated") are also
checked. ( MELSEC iQ-R Programming Manual (Program Design))
*2 Whether a file exists or not is checked. The file contents are not checked.
*3 Files are not checked at the point when an SD memory card is inserted during operation.
*4 The check is performed only for modules on the main base unit. (The system consistency check is not performed for the module
extension parameter for modules on the extension base unit, because the parameter cannot be stored in the CPU module.)
When a mismatch is detected
A stop error occurs in the CPU module of the standby system.
Perform either of the following operations to match the files in the CPU modules of both systems.
• Write files to the CPU modules of both systems.
• Execute the memory copy function to match the files stored in both systems. ( Page 405 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
*4

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 file
*2

Event history 
Device data storage file 
General-purpose data 
Data logging setting file Common setting file 
Individual setting file 
Remote password 