Siemens S7-1200 System Manual page 623

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From the "Data Logs" folder, you can open any of the data log files. If you have logged in

with the "write/delete files" privilege (Page 604), you can also delete, rename, and upload

files. The data log files are in comma-separated values (CSV) file format. You can save them

to your computer or open them in Microsoft Excel (default) or another program. Note that if

the PLC program has a data log open, you cannot delete it from the file browser page while it

is open. Also, you cannot upload a data log file if the filename already exists.

Time stamps for data logs

The Web server displays the time stamps for the data logs in either UTC time or PLC local

time depending upon your selection at the top of the page.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

11.5 Standard Web pages