Modbus TCP Client Diagnostic Variables Meaning

PLCnext Engineer
1

Hi, I have been attempting to use the built-in Modbus TCP Client. A number of diagnostics variables are presented:

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But the documentation provides no description on how to interpret each of these variables. It seems that some are from the Modbus standard (e.g. EXCEPTION_CODE), but I cannot find information on many other variables, like STATE, ADDITIONAL_ERR, or CONTROL_DIAG_STATISTIC.
Do you have any insight into how to interpret these variables?
Thanks.