Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 194

• Processing of file switching may take time depending on the setting. In this case, a date and time, which is
closer to present than the timestamp of the first record in the data logging file, is added even though "File
creation date" is selected for "Add date type".
• When "File creation date" is selected for "Add date type", a second information (two digits) added to a file
name is always even number.
• After a data logging stops (completes) and restarts, the serial number (eight digits) of the base file name
starts from 1 again in the following two cases: where the setting to delete data logging files after transfer is
completed by using the data logging file transfer function or where the CPU built-in memory is specified as
the file storage destination for transferring the files to the data memory (without using the data logging file
transfer function). If the storage file name consists of the serial number only, the existing files in the transfer
destination may be overwritten. It is recommended to add a date and time to the file name.
Action to take when the maximum number of storage files is exceeded
Either "Overwrite" or "Stop"
*1 This settings is not configurable for trigger logging.
■When "Overwrite" is selected
When the storage file switching condition is met after the specified maximum number of storage files is exceeded, the CPU
module deletes the file with the lowest serial number and creates a new file that has a serial number incremented by one from
the highest serial number, allowing data logging to continue. In addition, if deleting the file with the lowest serial number
results in an empty folder, the CPU module deletes that folder as well.
■When "Stop" is selected
As described in the following table, the action differs depending on when the specified maximum number of storage files is
exceeded.
Occurrence timing
When data logging is
started
While data logging is
running
*1 When an attempt is made to register the data logging settings again, the CPU module enters into the data logging completed state. A
special relay area (Data logging end) turns on to indicate that data logging is completed.
The files deleted by "Delete files completed transfer" in the data logging file transfer setting are counted as the
number of storage files. (Temporary stored files are counted as the number of storage files although they are
not stored in the SD memory card or function memory.)
When "Overwrite" is selected, the file being transferred may be deleted with the data logging file transfer
setting. It is recommended to set "Stop"
11 DATA LOGGING FUNCTION
192
11.6 Steps Until the Collected Data Is Saved
*1
can be selected as the action to take when the maximum number of storage files is exceeded.
Occurrence condition
There exist more storage files than the
specified maximum number when data
logging is started.
The specified maximum number of storage
files is reached due to file switching upon
the satisfaction of the storage file switching
condition.
Behavior
• If an attempt is made to register the data logging settings by the start operation from
CPU Module Logging Configuration Tool, an error occurs, resulting in failure to run
data logging.
• If an attempt is made to register
Module Logging Configuration Tool, a special relay area (data logging error) turns on
and a special register area (data logging error cause) stores its error cause, resulting
in failure to run data logging.
Data logging stops and enters into the completion state with the data logging settings
remaining intact. A special relay area (Data logging end) turns on to indicate that data
logging is completed.
*1
the data logging settings from outside CPU