Mitsubishi Electric MELSEC iQ-R Series User Manual page 289

• 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.
When the maximum number of storage files to be saved is exceeded
*1
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 Occurrence condition
When data logging is There exist more storage files than the
started specified maximum number when data
logging is started.
While data logging is The specified maximum number of storage
running files is reached due to file switching upon
the satisfaction of the storage file switching
condition.
*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.
can be selected as the action to take when the maximum number of storage files is exceeded.
Behavior
• If an attempt is made to register the data logging settings by the start operation from
• If an attempt is made to register
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.
CPU Module Logging Configuration Tool, an error occurs, resulting in failure to run
data logging.
*1
the data logging settings from outside CPU
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.
20.8 Steps Until the Collected Data Is Saved
20 DATA LOGGING FUNCTION
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