Thank you for this working solution.....however a daily sync job for the valve will still be necessary.

I am controlling my floor heating with a 3-way control valve and the temperature control valve is controlled by REXYGEN (PID + SCUV + MVD).
There is no feedback from the position of the valve (open loop), this is estimated within the MVD function block.

But every-time I download a new software version (or reboot the system) the estimated valve's position (y parameter from MVD block) is reset back to the value which is set in the Y0 parameter.
I would prefer that it remains at the last known position but this option is not readily available I guess....

I was thinking of writing some logic to sync the estimated valve position from the MVD with the real position every x hours by fully closing the valve. Maybe this logic should run at startup and then every x hours....
Would it be possible to use the SRTF function block for the one-time-at-start-up running of this logic? If yes, then how to use it?

Is there an English version of the SFCE editor?
Is there also some (English) manual available?

Thx

Kris

I wrote something about InfluxDb in the old forum
Link

No problem, it is only for some hobby-related stuff so no rush.

Grtz,

Kris

Hi Jaroslav,

Please find the uploaded Twincat project bellow :

0_1565617345317_TwinCAT Project3_20190812.zip

Thx & grtz,

Kris

Modbus TCP I already managed , it only took me quite some time before I figured out how the addressing is working.

To use Ethercat on the RasPi I will need a dedicated ethernet port I guess, correct?

Grtz,

Kris

I am expecting a BK1120 to arrive by the end of next week. So better to postpone everything until then....

BTW, the link to the YouTube video isn't working for me....

Maybe I mixed things up....nevertheless Beckhoff is mentioning that the BK9000 is supporting 'Beckhoff real-time ethernet' which I tought is the same as EtherCAT.

Also in the documentation of the BK1120 Beckhoff is refering to the BK9000, altough I don't completely understand what they mean with this.....

This is my current setup (....with some second hand modules from ebay... )

I also did an export description to XML from the BK9000. At the moment I don't have another bus coupler but as far as I understand the documentation then the BK9000 is also supporting Ethercat.....

0_1565192288634_XML_export_BK9000.zip