Retrieve variable values from Siemens LOGO! web server

[jatitsku]

Hi all!

I'm a total beginner with Domoticz, I hope this is the right subforum to ask help, since I believe I need to write a custom script for what I plan to do.

I have 3 kWh-meters with pulse outputs (1000 p/kWh) that I have connected to Siemens LOGO! PLC. I reset counters every 10 minutes and want fetch the final values. Values are stored in AM1-AM3 in PLC and I can see the values on variable page on the PLC's web server.

How can I import these values in to Domoticz?

Thanks in advance,
Jani

[waltervl]

Domoticz has support for S0 puls ports so perhaps you can make something out of that. No need for a plc but directly read the pulses with an interface https://www.domoticz.com/wiki/S0Meter
Or search the forum for watermeter as most solutions are based on pulses.

I never heard of connecting a plc counter output with Domoticz.
If the plc website is creating a JSON,csv or xml you could use one of the http poller https://www.domoticz.com/wiki/HTTP/HTTPS_poller

[JackD]

Perhaps you can use one of these SO interfaces, up to 5 channels, works great with Domoticz.

https://www.sossolutions.nl/5-kanaals-s ... ter-op-usb

[kiddigital]

For your situation, getting the values from pulsemeters, using the S0 would seem easier.

But as you already have the LOGO plc, and such PLC’s can do many things as well, maybe a more generic ‘interface’ between Domoticz and this plc can open up many new use cases.

Can you show some different examples of outputs of the plc? And how would you send a signal to the plc? What type of variables can you read and write?

[kiddigital]

Btw.. doesn’t the LOGO support modbus over tcp/ip? There is a python plugin for Domoticz that can talk modbus. Maybe that already works?

[jatitsku]

Btw.. doesn’t the LOGO support modbus over tcp/ip? There is a python plugin for Domoticz that can talk modbus. Maybe that already works?

Yes it does, I tried that first but modbus-read crashed domoticz. I upgraded to latest beta and it started working. I'm using raspbian bullseye.

Thanks to all for help.

[kiddigital]

Nice

Can you show some screenshot and info on how your setup works now? Great reference for others

[jatitsku]

modbus_domoticz.PNG (95.6 KiB) Viewed 2213 times

modbus_logo.PNG (86.76 KiB) Viewed 2213 times

Screenshots of modbus settings. It works, what more can I say

[kiddigital]

Great.. thx.. and maybe a screenshot of all devices created for the LOGO?