Mitsubishi Electric MELSEC iQ-R Series User Manual page 287

In redundant mode
After system switching, the file name in the old control system is not taken over to the new control system. (A number added
to the file name is not a serial number.)
An identifier added to the end of the file name indicates whether the systems are switched or not.
Identifier
*1*2
_NC
_CS
_SC
_SS
*1 With the trigger logging, the identifier "_NC" is added because the logging data is discarded at system switching.
*2 With the auto logging, the identifier "_NC" is added because the auto logging is completed when the systems are switched.
*3 Since three characters of an identifier are added to a file name, the save file name should be specified within 61 one-byte characters
(including an underscore (_), a serial number (eight digits), a period, and an extension). ( CPU Module Logging Configuration Tool
Version 1 Operating Manual (MELSEC iQ-R Series))
When the simple setting (default) is applied for the save file name, only a serial number is added to the file
name. If the systems are switched with this setting, which file is sequentially output cannot be determined.
Thus, the following settings are recommended. ( CPU Module Logging Configuration Tool Version 1
Operating Manual (MELSEC iQ-R Series))
• Simple setting: Select "Date" and "Time", and select "Date to establish file switching condition" in the add
date type.
• Optional setting: Enter a string indicating a date (YYYYMMDD) and time (hhmmss) in "Format", and select
"Date to establish file switching condition" in the add date type.
File switching condition
The following table lists the setting items that can be used to specify the file switching condition.
Setting item
Number of records
*1
File size
*1 File switching occurs before the file grows beyond the specified size.
However, file switching occurs regardless of the setting when:
• the number of records has reached the maximum number;
• the file size has reached the maximum size;
• the CPU module is stopped or suspended/resumed: or
• data logging is started and there is an existing stack file.
Trigger logging does not require the configuration of these settings because the stack file is automatically
switched to a storage file after as much data as the specified number of records is written into the stack file.
SM1218 (logging data storage file switching in progress) can be used to check if storage file switching is in
progress.
■In redundant mode
Switch the storage file at system switching at the following timing.
Storage file switching condition
System switching from control system to standby system
Description
The systems have not been switched.
The control system has been switched to the standby system.
The standby system has been switched to the control system.
The standby system has been switched to the control system and back to the standby system. (The system is
switched back to the control system while data is being written to the save file.)
Description
Specify the number of records within the following range.
• 1 to 65500
Specify the number of kilobytes within the following range.
• 10 to 16384K bytes
Storage file switch timing
When the data collected before system switching to the standby system is
transferred to the SD memory card
20 DATA LOGGING FUNCTION
20.8 Steps Until the Collected Data Is Saved
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