Modbus serial Profibus brick function code 70

Hi, I am using the CompactComm AnyBus brick for profibus, the Modbus serial variant.

I have my RTU communication operational, I can read the correct Module type and network type from the registers.

I am now attempting to read the configured Profibus Node address using function code 70. This node address is in network object 0x04, instance 1 at attribute 5. I have trouble constructing the Modbus request to retrieve this information. The Brick keeps sending me an exception code back for illegal_data_value.

Would it be possible to point me to additional documentation regarding the function code 70? What is in the "Anybus® CompactCom™ B40 Modbus Serial PROFIBUS Network Guide" is quite sparse. The document has an example to write virtual attributes, but nothing showing how I should read attributes from other objects.

Thanks in advance.

ALK

July 04, 2024 13:45

Hello Erik,

I am sorry for the late reply.

I will need to verify this on a Modbus Serial test setup, which I will have access to no sooner than upcoming Monday.

In the meantime, would you be able to open a ticket in our support portal describing your issue and maybe add your Modbus telegram that you tried until now?

Thank you.

Erik Van Hamme

July 04, 2024 13:49

I have managed to set the Node address via another way.

Thank you for the offer of assistance, but I am good for now. ;)

Modbus serial Profibus brick function code 70

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