11 DATA LOGGING FUNCTION
11.16 Precautions to Take When Using the Data Logging Function
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Data logging using the function memory as the data storage destination
■Power-off or reset during data logging
During data logging using the function memory as the data storage destination, do not power off or reset the CPU module.
During data logging, if the CPU module is powered off or reset before completion of the data transfer to the data memory
(before data logging is completed or stopped), all the data logging data (data logging files) in the function memory are deleted.
When the data logging file transfer function is used, all data logging data in the standby state are deleted as well.
When data logging is restarted after power-off or reset, a new data logging file is given a file name that uses a number
incremented by one from the end number of data logging file in the function memory before power-off or reset.
■Starting data logging during the file batch online change
Do not start the data logging using the function memory as the data storage destination during the file batch online change.
Otherwise, an error occurs at the start operation of data logging.
Data logging file transfer (FTP server auto transfer)
■Operations and functions that cannot be performed
While the following operation or function is being executed, the data logging file transfer function cannot be executed.
• Auto logging
■Data collection performance
The performance of the data collection is decreased compared to when the data logging file transfer function is not used. As a
result, missing may occur in the data logging setting in which no missing has occurred. When a missing has occurred, the
frequency of missing may be increased. ( Page 193 Missing Data)
■SD memory card during data logging file transfer
If the SD memory card is specified as the data storage destination of data logging files, an SD memory card cannot be
replaced during data logging file transfer. ( Page 206 SD Memory Card Replacement)
If the SD memory card forced disable function is executed or the SD memory card is removed during data logging file transfer,
a file transfer error occurs.
■Powering off and on or a reset operation during file transfer
If the CPU module is powered off and on or is reset during data logging file transfer, data logging files being transferred may
remain in the FTP server. The files being transferred and in the standby (retry) status are not transferred again.
■File transfer at power-off or reset
The files being transferred and in the standby (retry) status when the CPU module is powered off or reset are not transferred
again after the power-on or reset.
■Error at "Overwrite" operation of the data logging file
When "Overwrite" is selected for the operation at the time when the number of files exceeds the maximum number of files to
be saved, the file being transferred may be overwritten and a file transfer error may occur if the Ethernet line is busy.
To ensure the file transfer, configure the following settings.
1. Set a large value for "Number of files to be saved". ( Page 977 Save)
2. Set "Stop" for "Operation when exceeds the number of files". ( Page 977 Save)
3. Configure the setting to delete files that complete data logging file transfer. ( Page 200 Deleting files completed
transfer)
■Port number when using the socket communications function
For the data logging file transfer function, the own station port numbers F230H to FFFEH are used. Thus, do not specify the
own station port numbers F230H to FFFEH for the connection establishment instruction (SP.SOCOPEN) of the socket
communications function while the data logging file transfer function is executed. Otherwise, the instruction may be completed
with an error.
■SLMP communications
For the SLMP communications, port numbers set with the parameters take a priority. Thus, the SLMP communications are not
affected by this function even if F230H to FFFEH are specified for the own station port number with the parameters.
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