... after a long time - this thread has started.
Currently, I have two Siemens LOGO PLCs at home connected to the LAN and controlled by Domoticz via NodeRed.
Everything works well and stably.

Zrzut ekranu 2026-01-23 183042.jpg

The flow created with ChatGPT took several days of testing, failures ...

Hello @Daro1002,

I do not own a Logo PLC (like the Shelly 2PM, when developing those other flows), so testing, etc. has to be done by yourself.

However, I noticed, that a simulation program for the Siemens Logo PLC exist, but I have not been able to download it, yet.
Have to look for a Linux version ...

Hello @Daro1003,

Sure we can help, but it will depend on which Logo PLC you have.
NR has an example for the Logo 8.
See; https://flows.nodered.org/flow/f36b5e6e ... eb45cbad0d

As far as I can see, it uses the S7 protocol.

Let me know,

Regards

... settings because Domoticz freezes.

There must be another way, since Siemens Logo supports Modbus communication, so perhaps NodeRed will help?
@FireWizard is an expert on the subject, so maybe he can help.

... and safe) but others prefer something else.

I am not aware of a Logo PLC integration but did not Google for it (you probably did that already).

Edit, also check the forum search: https://forum.domoticz.com/search.php?keywords=siemens+logo

Hello,
Is it possible for Domoticz to communicate with a Siemens LOGO PLC? If not, can Domoticz easily communicate with another PLC?
If it's possible with Siemens LOGO, how do I do it? I happen to have a Siemens LOGO in stock.

I'm asking because I'd like to implement lighting automation, and on the ...

In the modbus plugin in field communication you can change the mode you have to +Debug

I cannot find the debug level setting in Domoticz.
And yes I using the plugin what you mentioned

In the plugin configuration (menu Setup - Hardware) normally you can set the debug level of the python plugin.

Are you using this plugin or another? https://github.com/DomoticX/domoticz-modbus

Yes I use modbus over TCP/IP
How can I run debugflags?

Were can I write the modbus adress?
I there some one who has an example for me?

Thanks!

How do you connect your logo8 to your Pi? Are you using ModBus over TCP/IP?

Try running domoticz with debugflags to see more info.

Hi
All my devices are now connected to the Logo, so and I will also read some data from Logo to Domoticz and operate switch actions in Logo.
I have no devices in Domoticz yet.
So I need to set the correct modbus settings.
In Logo I am using only "pulse switches" they produce a short pulse (a second ...

... am not a modbus expert but do you have no Domoticz devices being created by the modbus plugin? Because those seem to be the devices to control your Logo. Look in menu setup devices. If the device has a green arrow in the last columns then it is not activated and you should activate it first.

A ...

Hi,

I am a new Domoticz user and I am using Siemens Logo8 for my home automation.
Now I will read and write I/O between Domoticz and Siemens Logo8.
What I have done:

- prepare modbus "client" connection in LogoSoft including Domoticz IP
- Installing Domoticz on my Raspberry Pi 4
- installing Domoticz ...

... Developer account.</li>
<li>Device E-number: Unique E-number of the Siemens/Bosch device.</li>
</ul>
<br/><br/>
</description>
<params>
<param ... x].LastLevel))
return

def loadIcons(self, Images):
#Home-Connect Logo
if self.HOMECONNECT_ICON in Images:
Domoticz.Debug("ID: "+str(Images ...

... similar problem on a synology system.


2022-11-17 10:47:46.566 Error: Siemens Logo I1: (ModbusREAD) failed to load 'plugin.py', Python Path used was '/opt/domoticz/userdata/plugins/modbus-read/:/usr/lib/python37.zip:/usr/lib/python3.7:/usr/lib/python3.7/lib-dynload:/usr/local/lib/python3.7/dist ...

... parameters, prime numbers from 11 to 43 seconds. I suspect PLC (Siemens LOGO!) doesn't handle well several modbus request at same time. Mostly works. I only get errors when multiple parameters are read about the same time.

EDIT:
I ended up putting some random sleep in plugin, like this ...

... parameters, prime numbers from 11 to 43 seconds. I suspect PLC (Siemens LOGO!) doesn't handle well several modbus request at same time. Mostly works. I only get errors when multiple parameters are read about the same time.

EDIT:
I ended up putting some random sleep in plugin, like this ...

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

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