Huawei - Input Register not working

[Chandrias]

I managed to intergrade my Huawei solar inverter and communicate over TCP modbus.
Unfortunately, what I haven't manage to do, is send values to the inverter over register 40120,
which is the one controlling the active power of the inverter.

Attached you can see the profile I created for the inverter and the documentation from the manufacturer.

[admin]

Input registers are read-only. Type must be set to "register" and "writable" flag must be enabled for writing to work.

[Chandrias]

I also tried with this configuration, but still no success

[admin]

Have you created the device again from scratch after modifying the profile? You should use the Modbus profiler app which allows editing existing devices.

[Chandrias]

Have you created the device again from scratch after modifying the profile? You should use the Modbus profiler app which allows editing existing devices.

I changed it over the Modbus profiler app.
BTW on my initial configuration I had it as a register and I only changed it after I realized it didn't work properly

[admin]

Can you write to any other register?

[Chandrias]

Can you write to any other register?

I also tried register 40125, but still not working.
The registers are tested over another application and work just fine

[Daniel]

what are the settings when using another application?

[Chandrias]

what are the settings when using another application?

[admin]

Run this script once and post what you get in LM Logs tab. Change Modbus device IP if needed.

Code:

mb = require('luamodbus').tcp() mb:open('192.168.99.141', 502) res, err = mb:connect() if res then   mb:setslave(2)   res, err = mb:writeregisters(40120, 300)   if res then     log('write ok')   else     log('write failed', err)   end   else   log('connection failed', err) end mb:close()

[Chandrias]

Run this script once and post what you get in LM Logs tab. Change Modbus device IP if needed.

Code:

mb = require('luamodbus').tcp() mb:open('192.168.99.141', 502) res, err = mb:connect() if res then   mb:setslave(2)   res, err = mb:writeregisters(40120, 300)   if res then     log('write ok')   else     log('write failed', err)   end  else   log('connection failed', err) end mb:close()

I set it to run every 5 seconds and I get these messages

[admin]

Are you sure that the IP address is correct? Increase the interval to 60 seconds.

You might need to temporarily delete the device from LM Modbus tab to free up a connection. Are you using persistent connection in the device settings?

[Chandrias]

Are you sure that the IP address is correct? Increase the interval to 60 seconds.

You might need to temporarily delete the device from LM Modbus tab to free up a connection. Are you using persistent connection in the device settings?

IP is correct
Interval changed to 60 seconds, but the messages are still the same
I was not using a persistent connection. I changed it to persistent, but still I get the same messages

[admin]

Have you deleted the device before running the script? What do you have in Modbus tab Error log?

[Daniel]

If nothing helps, try rebooting inverter.

[Chandrias]

Have you deleted the device before running the script? What do you have in Modbus tab Error log?

Deleting is not the optimum idea. You should have a deactivate option instead.


I deleted the device, I still get the same messages and nothing on the errors

[Daniel]

Did you reboot inverter?

[CristianAgata]

Hi Chandrias,
I think before write this register you must set some parameters before. Have you done?
Best regards Cristian Grassi

[Chandrias]

Hi Chandrias,
I think before write this register you must set some parameters before. Have you done?
Best regards Cristian Grassi

Yes I did. I also tested writing on that using another software "modbustester" and it works fine

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Did you reboot inverter?

Yes

[Daniel]

LM is not even connecting to your inverter, there must be something wrong in the settings or network.