20 DATA LOGGING FUNCTION
20.8 Steps Until the Collected Data Is Saved
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• 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
Either "Overwrite" or "Stop"
*1
can be selected as the action to take when the maximum number of storage files is exceeded.
*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.
*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.
Occurrence timing Occurrence condition Behavior
When data logging is
started
There exist more storage files than the
specified maximum number when data
logging is started.
• 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
*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.
While data logging is
running
The specified maximum number of storage
files is reached due to file switching upon
the satisfaction of the storage file switching
condition.
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.
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