Hello Forum,

   Wish everyone is doing fine.

   I am in a kind of a trouble with saving data on a hmi.

   I am in a project that customer wants a trend of a burner's burning percentage. I mean in trend view. In addition to it they want to save that data for a day or for two days and to be able to look at it to see the trend's past. 

   I got a TP 1500 comfort panel and haven't got a usb neither SD Card. 

  How can i save the trend?

   Also what is the capacity of the panel's own memory? For how long that trend could be saved in without any external memory ?

   I would really appreciate if you answer and help.

   Have Good Day 

   Thank You 

Hello 

You can Print your Trend into PDF in your HMI ... you can see the link below 

https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=58205602&caller=view

Hello thescottishfold,

here is an application example that Shows how to save and recall data in a structured manner over several days.

You could implement a simpler version, because you only need to save it for two days.

• "Long-Term Data Archiving with WinCC Runtime PC and SIMATIC HMI Operator Panels with WinCC (TIA Portal)"
  https://support.industry.siemens.com/cs/ww/en/view/109477071

It is possible to write into the internal Memory (use // instead of a USB/SD path), but it is NOT recommended:

Which external storage locations are available on the various operator panels (TIA Portal/WinCC flexible/ProTool) for archiving data?
https://support.industry.siemens.com/cs/ww/en/view/20681208

Cyclic write access is not permissible for the internal flash memory, because this reduces the service life of the flash memory and therefore the service life of the operator panel. For the sake of the service life of the device and better performance you should as far as possible use external memory cards for storing data records and for archives.

 Is the panel in a network? You could save the data to a PC or similar in the network.

• "How do you integrate an HMI operator panel into a local Network?"
  https://support.industry.siemens.com/cs/ww/en/view/13336639
  

It is also possible to show the trend of a log outside the panel on a PC:

• "How can you graphically display the contents of the tag archive of a Comfort Panel or the WinCC Runtime Advanced on the PC without WinCC (TIA Portal)?"
  https://support.industry.siemens.com/cs/ww/en/view/60520367

The size of you log and the length is deteminded by how often you log the value.

WinCC gives you an estimate of the file size in the proberties of the log.

If you compile the panel project you can see how big the project is. (X used Bytes of Y possible Bytes).

Y is the size of the usable internal memory you where asking for.

    Hello H.J. ,

  Thank you for the detailed answer, it helped me a lot. I used the sample program that you posted.

H.J.

Hello thescottishfold,

here is an application example that Shows how to save and recall data in a structured manner over several days.

You could implement a simpler version, because you only need to save it for two days.

• "Long-Term Data Archiving with WinCC Runtime PC and SIMATIC HMI Operator Panels with WinCC (TIA Portal)"
  https://support.industry.siemens.com/cs/ww/en/view/109477071

It is possible to write into the internal Memory (use // instead of a USB/SD path), but it is NOT recommended:

Which external storage locations are available on the various operator panels (TIA Portal/WinCC flexible/ProTool) for archiving data?
https://support.industry.siemens.com/cs/ww/en/view/20681208

Cyclic write access is not permissible for the internal flash memory, because this reduces the service life of the flash memory and therefore the service life of the operator panel. For the sake of the service life of the device and better performance you should as far as possible use external memory cards for storing data records and for archives.

 Is the panel in a network? You could save the data to a PC or similar in the network.

• "How do you integrate an HMI operator panel into a local Network?"
  https://support.industry.siemens.com/cs/ww/en/view/13336639
  

It is also possible to show the trend of a log outside the panel on a PC:

• "How can you graphically display the contents of the tag archive of a Comfort Panel or the WinCC Runtime Advanced on the PC without WinCC (TIA Portal)?"
  https://support.industry.siemens.com/cs/ww/en/view/60520367

The size of you log and the length is deteminded by how often you log the value.

WinCC gives you an estimate of the file size in the proberties of the log.

If you compile the panel project you can see how big the project is. (X used Bytes of Y possible Bytes).

Y is the size of the usable internal memory you where asking for.