Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 217

Behavior at parameter change when functions consuming the internal buffer are active
If the internal buffer capacity setting is changed during the execution of the functions that consume the internal buffer,
attempting to start data logging results in an error, where the data logging fails to start.
Function that consumes Function in execution
the internal buffer other
than data logging
Function in execution
Data logging
Internal buffer capacity setting changed
(by changing the parameters of
internal buffer capacity setting)
CPU module operation when registering the data logging
Note that the operating status of the CPU module is not changed until the following data logging registration or data save
processing is completed. (The operating status may not be switched to STOP immediately.)
• While saving the data in the internal buffer by changing the operating status of the CPU module from RUN to STOP or
operation to stop/pause data logging from CPU Module Logging Configuration Tool
• When the multiple data logging settings are started at the same time (when the multiple data loggings are registered again
at the same time)
• When the data logging is started with any unused folders remaining in the storage memory
The waiting time for the operation status change of the CPU module is shortened by reducing the number of data logging
settings and deleting unused folders.
Unicode text file
To view the data, use a software application with Unicode support. The data may be displayed incorrectly in a software
application with no Unicode support. To open a Unicode text file with multiple lines of comments in Microsoft
to drag and drop the file on the Microsoft

Microsoft Excel.
Registration of the available devices
■User device, system device, file register, and index register
The data logging settings can be registered when devices of the CPU module exist. When a device number outside the range
is specified, an error occurs at the registration.
■Module access device (buffer memory) and link direct device
The data logging settings can be registered when the buffer memory and devices of the target module exist. When the target
module is not mounted or a device number outside the range is specified even with the target module mounted, an error
occurs at the registration.
■Local device
The data logging settings can be registered when the target program name and devices in the target program exist. When a
device number outside the range of the target program is specified, an error occurs at the registration.
Data logging stopped
(by clicking [Stop] button)

Excel window; otherwise, the content of the file may be displayed incorrectly in
11.16 Precautions to Take When Using the Data Logging Function
An error occurs.
Data logging is not allowed to start.
Data logging attempted to start
(by clicking [Start] button)

Excel, be sure
11 DATA LOGGING FUNCTION
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