Dear friends,

Just to share a cluster of threads on similar topic:

HD_Log internal variables of S7 CPUs

There are some possiblities:

1-Tag archiving capability of WINCC
2-Autem PLC analyzer (possible to export data)
http://autem.de/index.php?site=en_home
3-ibaPDA-S7-Analyzer
http://www.iba-ag.com/

I hope this helps,

Hamid Hosseini

Hello again,

Basic package of STEP 7 is not capable of providing trend views and archive data for further process.This is possible with RSLOGIX5000 from Rockwell automation and I am not sure about exporting data in it.

For your case, you can try SIMATIC WinCC, as a complex solution, or search for data loggers from other manufacturers.They provide you logged data ,cycle precise , in a trend view plus export options.Please, visit the website for mentioned products or search the web for any data logger via MPI as a free software.

I hope this helps,

Hamid Hosseini

To generate an alarm based on a switch, I suggest using a flip flop with set input prior and trigger operator acknowledgement via reset input.Assign a global memory to flip flop and assign that memory to a Tag in tag management of SIMATIC WinCC.Finally, after enabling alarm logging in start up section of your project's properties, assign a text to your tag and check the result in runtime.

More can be found in WinCC getting started manual (section 9-configuring messages):

https://cache.automation.siemens.com/dnl/zY/zYyOTc4MwAA_73505596_HB/GettingStarted_en-US.pdf

If you are not connected to a PLC , follow these steps:

1. Create an internal tag (binary)
   
2. create button
3. its properties-->event-->mouse
4. press left-->direct connection--> value 1 to the internal  tag
5. release left->direct connection--> value 0 to the tag

Don't use C script that makes it more complex for you.While pressing the button, a pulse is generated.Assign this bit to a text in alarm logging database.