Hello, i'm trying to write a DeepSea8610's device slave address register, through a Modbus TCP connection. however, when I try to write a new value I got "Illegal Data Address" over the logger info. I've already checked the OPC client connection configuration to disable the read only statement, I've…

[image] David_Lopez: The problem is that I need to write the value on register offset 8 and its compliement on 9. Given the value for offset 8 is in a python variable named sysCtlKey, you would do something like this: system.opc.writeValues('Ignition OPC UA Server', ['[devName]HRUS4105', '…

Do you have documentation that shows what register you should be writing to? Can you get a Wireshark capture? From the logs it looks like it’s already using Write Multiple Registers, so that’s probably not the issue.

Hi Kevin, these are the registers, I have to calculate the real registers based on the offset and page shown in the documentation. [image] [image] The problem is that I need to write the value on register offset 8 and its compliement on 9. Calculating the real holding registers are 4104 and 410…

These are the values I should be able to write [image]

You will not be able to create Ignition OPC tags for any of the registers that are marked write-only. For those, you will need to use the system.opc.write*() functions directly. You probably won't have any problems with spanned gaps based on that formula (the gaps are too big to span anyways).

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Can't Write OPC Tag - illegal data address

Ignition

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