Help diagnosing MODBUS TCP timeout issues

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1

I am trying to connect to a chiller/circulator using MODBUD over TCP. I have created the connection in the OPC UA section of my server, and I see it appear in my Vision Designer. I think I am using the write OPC path, but the tag quality is returns bad with the error:

Bad("Bad_Timeout: The operation timed out.")

I want to make sure that I've configured the tag correctly. Please see below:

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My server logs are full of timeouts and even some disconnections:

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Not really sure where to start in debugging this. These same messages are seen in my log files.

2

Have you tried a different unit id (address 1.IRUI1 for example)?

Do you have any other Modbus software that can successfully communicate (Modpoll, or similar)?

3

I needed to add the unit ID to the tag path. Thanks!