11 DATA LOGGING FUNCTION
11.16 Precautions to Take When Using the Data Logging Function
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Data transfer to the data memory
■Free space in the data memory
When the transfer to the data memory is set, delete data by user data operation in the engineering tool to free up space in the
data memory for storing the transferred data logging files.
When a file transfer error occurs due to out of data memory space during transfer to the data memory, free up the required
space and turn off and on SM653 (File transfer to data memory request) to transfer the data to the data memory again.
Check the required free space for transfer to the data memory as follows.
Required free space for transfer to the data memory = Function memory capacity
*1
- Function memory free area capacity
*2
.
*1 The size can be checked in SD648/SD649 (Function memory capacity).
*2 The size can be checked in SD650/SD651 (Function memory free space capacity).
The data logging file in the function memory are not deleted by transferring data to the data memory by using SM653. Thus,
after transferring data to the data memory by using SM653, it is recommended to turn off and on SM652 (Function memory
clear request) and delete unnecessary files in the function memory for the next data logging.
■When the CPU module is in the STOP state and data logging is in the pause state
When the CPU module is in the STOP state, and the data logging is in the pause state, data is not transferred to the data
memory. Turn off and on SM653 (File transfer to data memory request) as necessary and transfer data to the data memory
again.
■Power-off or reset during the data transfer to the data memory
• When an error occurs during the data transfer to the data memory, all data logging files in the function memory are deleted
when the CPU module is powered off or reset. Turn off and on SM653 (File transfer to data memory request) as necessary
and transfer data to the data memory again.
• During the data transfer to the data memory, a temporary file "LOGGING_T.TMP" is created and file name is changed after
completion of the file transfer. Therefore, if the CPU module is powered off or reset during the transfer, the temporary file
may remain. In that case, delete the file by user data operation in the engineering tool.
■Starting data logging during the data transfer to the data memory
Since the data logging of the same setting number cannot be started during the data transfer to the data memory, start data
logging after completion of the file transfer. Otherwise, an error occurs at the start operation of data logging.
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