Extended instructions
9.9 Recipes and Data logs
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
525
The data log files are stored as comma separated value format (*.csv) in persistent flash
memory. You can view the data logs by using the PLC Web server feature or by removing
the PLC memory card and inserting it in a standard PC card reader.
Viewing data logs with the PLC Web server feature
If the PLC PROFINET port and a PC are connected to a network, then you can use a PC
web browser like Microsoft Internet Explorer or Mozilla Firefox to access the built-in PLC
Web server. The PLC may be in run mode or stop mode when you operate the PLC Web
server. If the PLC is in run mode, then your control program continues to execute while the
PLC Web server is transferring log data through the network.
Web server access:
1. Enable the Web server in the Device Configuration for the target CPU (Page 1003).
2. Connect your PC to the PLC through the PROFINET network (Page 1007).
3. Access the CPU through the built-in Web server (Page 1011).
4. Download, edit, and delete data log files with the "File Browser" standard Web page
(Page 1037).
5. Open the .csv file with a spreadsheet application like Microsoft Excel.
Note
Data log management
Keep no more than 1000 data logs in a file system. Exceeding this number can prevent the
Web server from having enough CPU resources to display the data logs.
le Browser Web page is not able to display the data logs, then you must
place the CPU in STOP mode in order to display and delete data logs.
Manage your data logs to ensure that you only keep the number that you need to maintain,
and do not exceed 1000 dat
a logs.
Viewing data logs on a PLC memory card
If the S7-1200 CPU has a "Program" type S7-1200 memory card inserted, then you can
remove the memory card and insert the card into a standard SD (Secure Digital) or MMC
(MultiMediaCard) card slot on a PC or PG. The PLC is in stop mode when the memory card
is removed and your control program is not executed.
Use the Windows file explorer and navigate to the \DataLog directory on the memory card.
All your \*.csv data log files are located in this directory.
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