Tutorial for MMS communication

Hi!

I'm involved in a project were have two AC800 controllers that is supposed to talk to each other. One is PM851A, the other model number I don't have at the moment. The things we want to share with them are analog values and digital signal e.g. setpoints and start signals.

Between them there is Ethernet network and they will most likely also be within the same subnet as well. But the will both i a part in two superior control systems

I have been searching around the manuals didn't mention much on how to actually get started and how to code.

Is there any tutorial regarding this available or can someone out there in the forum help me?

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sortofwhat Rank: 1478

Asked 2 years ago

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Of course, it is possible easy to exchange variables between ABB AC800M controllers. Type of the processor module is not so important in this case, they could be different.

You have a two easy possibilities, using Ethernet: MMS communication (with access variables) and IAC communication between controllers.

Both are very good described in the manuals, you have to read it.

For example, from Google appear the following:

3BSE035982-510

AC800M Communication Protocols

Also many other discussion in AKS about that issue

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by sortofwhat Rank: 1478 on 3/16/2017 2:32:36 AM | Like (0) | Report

Thank you for answering!
I have read the MMS chapter in the very same manual that you suggest before I posted my question here. The chapter do tell stuff about topology, define address to the other controller, the use of access variables and so on.

But to me it doesn't explain further on how to receive/send values to each other inside the application.
The help topics in CCB mentioned communication library but not how to actually use them. So more or less I don't get enough of the whole picture to set up two controllers sharing variables.

I also tried to find information here on AKS. I apologize if I didn't search enough but most the threads regarding MMS was about troubleshooting, not starting the communincation in the first place.

by kstoilov AKS expert

Rank: 5 on 3/16/2017 2:50:38 AM | Like (0) | Report

It is different issue. In case you need to exchange variables between two different application in the same controller, you have to use IAC or to put these variables as Global - in application list of variables. Then you can see them from all applications in this controlle.
In case you need to exchange variables between two different controllers, I use MMS communication library. Then usually you will MMSConnect, MMSRead, MMSWrite. Detail description is in help file of control builder.
Other option is IAC, as I mentioned, and then the library is IAC MMS

by kstoilov AKS expert

Rank: 5 on 3/16/2017 2:52:37 AM | Like (0) | Report

Most important information is available in help file, with links to detail documentation as pdf. You can ask in case you need some particular information how to do something with this libraries

by sortofwhat Rank: 1478 on 3/16/2017 3:39:11 AM | Like (0) | Report

Then it's MMSConnect, MMSRead and MMSWrite I will investigate further since this case is about sending values between two different controllers. And I tried to read about MMS from several different sources before asking here :)

Thank you!

by kstoilov AKS expert

Rank: 5 on 3/16/2017 4:15:48 AM | Like (0) | Report

Yes, in one of the controllers you should define Access Variables MMS and from the other controller you can read or write it with MMSConnect, MMSRead and MMSWrite. And vice versa

by kstoilov AKS expert

Rank: 5 on 3/16/2017 4:16:49 AM | Like (0) | Report

IAC is also an option

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