Modicon M340 OPC UA UMAS_Protocol Error

[aroningir]

Hi

I am trying to connect to a few Modicon M340 PLCs using OPC UA. I have followed the instructions in the video here: https://www.se.com/ww/en/faqs/FA411749/ 

I am successfully able to connect to 2 of my PLCs, but I am unable to connect to the rest. 

I get the same error for all the other PLCs as is shown in the attached image. 

The only difference I can see is that on the 2 PLCs that connect they have newer firmware than the rest.

Do I need to upgrade the firmware on the other PLCs to be able to connect using OPC UA?

Or is there another reason for why I am unable to connect to them?

I can't find anything about these error codes online

Thanks in Advance

Aron

[Jeniferrobort]

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@aroningir wrote:

Hi

I am trying to connect to a few Modicon M340 PLCs using OPC UA. I have followed the instructions in the video here: https://www.se.com/ww/en/faqs/FA411749/ 

I am successfully able to connect to 2 of my PLCs, but I am unable to connect to the rest. 

I get the same error for all the other PLCs as is shown in the attached image. 

The only difference I can see is that on the 2 PLCs that connect they have newer firmware than the rest.

Do I need to upgrade the firmware on the other PLCs to be able to connect using OPC UA?

Or is there another reason for why I am unable to connect to them?

I can't find anything about these error codes online

Thanks in Advance

Aron

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Did you get any solution?

[RoozeeR]

Hello,

1: Did you check in Unity/Control Expert if the checkbox " DataDictionary" is selected? See screenshot attached, DataDictionary enabled is mandatory.

2: And if yes, is the checkbox "Only HMI Variables" also selected? Then check if there are variables with in the Data Editor, which have the checkbox HMI variables selected.

3: If the checkbox "Only HMI Variables" is not selected all variables should be exposed in the Data Dictionary to OPCUA when he checkbox " DataDictionary" is selected.

If all this is set, please check the firmware used in the CPU and NOC/NOE (if used) cards.

[aroningir]

Hi 

Thanks for the answer.

I have the "DataDictionary" checkbox selected and I have tried it with and without the "Only HMI Variables" checbox checked. In both cases I get the same error as mentioned in my original post.

The firmware I have on the CPUs that don't work is 2.10 and 2.00.

The firmware I have on the CPUs that work is 2.60

Thank you

Aron 

[RoozeeR]

Hello Aron,

There is your answer. V2.00 and v2.10 are rather old.

Best to upgrade the CPU's to latest version (3.40), which also bring a lot of improvements to Cyber Security issues.

Also you might consider to upgrade your application (CPU type version in Unity/ECE).

br