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11 DATA LOGGING FUNCTION
11.16 Precautions to Take When Using the Data Logging Function
■When a file operation related to the data logging is performed during the execution of the data
logging function
The following table lists the cases when a file operation related to the data logging is performed during the execution of the
data logging function.
■When an attempt is made to write the data logging setting file during the execution of another
function
The following table lists the cases when an attempt is made to write the data logging setting file during the execution of
another function.
Locations from which data logging can be performed
Data logging cannot be performed from multiple locations to the same setting number. The CPU module supports data
logging performed concurrently at a maximum of 10 locations assigned to setting numbers 1 to 10.
Retention and clearance of data logging settings
After the data logging is started, the registered data logging settings are latched. Thus, if the data logging is started
(registered) before powering off and on or resetting the CPU module, register the settings again when performing the
following operations to the CPU module; Powering off and on and switching the operating status to RUN; Resetting and
switching the operating status to RUN; Switching the operating status from STOP to RUN.
As a result, data logging can be executed again with the registered data logging setting.
However, the registration of the data logging settings is canceled in the following cases. (The corresponding SM number to
the data logging setting number among relevant special relay areas (data logging preparation) turns off.)
• The CPU module is turned off and on or is reset without an SD memory card that contains the data logging setting file.
• The replaced SD memory card does not contain the data logging setting file and the CPU module is turned off and on or is
reset.
*1
*1 If the data logging setting file contained in the replacement (new) SD memory card is different from that contained in the replaced (old)
SD memory card, register the data logging setting file contained in the replacement SD memory card.
It is necessary to register the data logging settings again by the user operation of starting data logging in CPU Module
Logging Configuration Tool.
Behavior that occurs when trigger logging is resumed
If data logging is stopped or collection is suspended before the completion of trigger logging and subsequently data logging is
run again, data collection begins from the initial state before trigger logging, rather than continuing from the last time.
Target file File operation Behavior
Data logging setting file/common
setting file
Write/delete During execution of the data logging function, data cannot be written/deleted to/in the
data logging setting file/common setting file being used.
Folder delete Folders cannot be deleted from the $MELPRJ$ folder in which the data logging
setting files and the common setting file are stored.
Initialize During execution of the data logging function, the memory storing the data logging
setting files and the common setting file being used cannot be initialized.
Data logging file Write/delete/folder delete During execution of the data logging function, data cannot be written/deleted to/in or
folders cannot be deleted from the data logging file being used.
Initialize During execution of the data logging function, the memory storing the data logging
file being used cannot be initialized.
Function that has been
already executed
Behavior
Online change (ladder block) ■When a label is specified as the collection start condition, data collection target, or trigger condition
• The online change (ladder block) is completed.
• The data logging setting file cannot be written.
File batch online change ■When a label is specified as the collection start condition, data collection target, or trigger condition
• File batch online change is completed.
• The data logging setting file cannot be written.
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