Mitsubishi Electric MELSEC iQ-R-R00CPU, User Manual

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28 FUNCTIONS
28.15 Data Logging Function
Switching to a storage file
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.
* 3
*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). (  Page 977 Save)
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. (

Page 977 Save)
• 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.
Storage file switching condition
Switch the storage file at system switching at the following timing.
Writing the data logging setting
When the data logging setting is written, please note the following.
• While the data logging setting is being written, do not perform the following operations on both of the control system and
standby system.
• In the following cases, the setting is written only to own system.
Auto logging function
• The auto logging function cannot be used in the standby system. Even though an SD memory card that stores the data
logging setting file for which the auto logging function has been enabled is inserted, the data logging is not started
automatically.
• When the systems are switched during auto logging, the auto logging is completed.
Identifier Description
_NC
*1*2
The systems have not been switched.
_CS The control system has been switched to the standby system.
_SC The standby system has been switched to the control system.
_SS 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.)
Storage file switching condition Storage file switch timing
System switching from control system to standby
system When the data collected before system switching to the standby system is transferred to the SD
memory card
• Turning off or resetting the CPU modules
• Connecting/disconnecting the tracking cable
• Online module change of redundant function modules
• The other system CPU module is off or reset.
• A hardware failure (a failure of the CPU module or redundant function module) has occurred on the other system.
• A tracking cable is disconnected or incorrectly connected, or failed.
• Tracking communications stops due to an error in the CPU module.