Who can configure and pay? for wago 750-841
As I have no idea what you are asking, I did a web search:
WAGO 750-841 Ethernet Fieldbus Controller
It appears to be a IP connected industrial control module with PIO.
Use a Raspberry Pi or ESPhome instead? 
FYI, Modbus (a type of Fieldbus used a lot in kit like ASHP) is being re-worked like other gateways (IR, RF, etc):
… discontinued in 2013! The first raspberry Pi was celebrating its first birthday when this thing was killed off. It’s a museum piece at best.
It is a Modbus PLC running CODESYS that I use to control the house, and I would like to control the inputs and outputs using HA.
You may find the Protocol Wizard an effective way of live experimentation, given you have the appropriate documentation.
The DIN mounted interface device:
Industry standard you use:
https://www.codesys.com/
Some related discussion you may find relevant:
Sounds like you already have the hardware, software, running system, mostly industry standard, and well established, and a functional HomeAssistant server, and all you need to do is to string it together. The Wizard will help with that.
Tell us what you have tried, what you need in more detail, and we may be able to fill in the missing gaps for you, and at the same time your knowledge will get a massive boost and empoweredment brings satisfaction.
Keep us posted on progress. That way others can learn too when facing similar challenges.
[A hint for readability and to make it easy for people to respond: If you are posting code, yaml, logs or quoting, please use the forum </> formatting tools]
[Another hint: While this superficially and temptingly looks like an ideal challenge for a quick AI vibe session, either inside or external to HomeAssistant, be aware of outdated sources it may use that may be used to distract you down well-trodden but faulty paths extracted from forums like these that have problems documented to various degrees of accuracy, but often very superficial or non-existent solutions. Best stick to original vendor documentation and understand that yourself first, and that way you can recognise and avoid LLM hallucinations that somebody may offer you for a quick but unstable buck.]