Working with modbus TCP / RTU gateway

Hello Lumirt;

Welcome to the forum.

One thing you will learn is that we need more information on your project if we are to help you.

Please tell us more about the gateway you are using (make and model) and give us a screenshot of the code you are having trouble with.

Hope this helps,

Daniel Chartier 

Hello,

my screen is attached. 

I use gateway MOXA MGate MB3170

Hi Lumirt

Your code looks good to me, using the move instruction should work fine. I suspect you connect parameter is wrong, please post a screenshot of that one too.

Side question, are you going to pull data from other devices on the rtu bus ?

Kind regards,
Ola

Thanks Lumirt

I have written a open source modbus library that I believe will be useful for you.

If these seven devices are of the same type, the library let you create one FB with the queries for that particular device, and then you may have as many instances of of FB as you need.

The library will also be useful if there are diffident devices on the rtu bus.

Please ask if you have any questions or you need any help.

You may download the whole library on Github:
https://github.com/rexhip/rexhip/releases/