Modbus tcp error

General
1

Hello,

I am trying to read data from Modbus tcp but I receive this error:

"Error: Modbus exception 3: Illegal data value (value cannot be written to this register)"

Thanks and regards.

2

You say you are trying to read data but the error suggests you are trying to write data.

Are you trying to write to a read-only address or an address that does not exist?

Have you tried reading simple registers that you definitely know exist?

3

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