Mitsubishi Electric MELSEC iQ-R Series - Page 301

20 DATA LOGGING FUNCTION
20.16 Precautions to Take When Using the Data Logging Function
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■When the data logging function is executed during the execution of another function
The following table lists the cases when the data logging function is executed during the execution of another function.
*1 The data logging function is not included here.
■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.
Function that has been
already executed
Function to be executed
later
Behavior
Online change (ladder block) Data logging function ■When a step number is specified as the collection start condition or trigger
condition
• The online change (ladder block) is completed.
• The data logging cannot be executed. (An error occurs when the start operation of
the data logging is performed during the online change (ladder block).)
File batch online change ■When a step number is specified as the collection start condition or trigger
condition
• File batch online change is completed.
• The data logging cannot be executed. (An error occurs when the start operation of
the data logging is performed during the file batch online change.)
CPU module data backup function While the CPU module data backup function is being executed, a logging setting file
cannot be written/deleted or a logging setting cannot be registered/cleared.
CPU module data restoration
function
While the CPU module data restoration function is being executed, a logging setting
file cannot be written/read/deleted or a logging setting cannot be registered/cleared.
Function specified in the internal
buffer capacity setting
*1
If the internal buffer capacity setting is changed to execute data logging, attempting
to start data logging results in an error. The function already in execution continues to
function normally.
Function not specified in the
internal buffer capacity setting
If the internal buffer capacity setting is changed to execute data logging, attempting
to start data logging results in an error. The function already in execution continues to
function normally.
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.