How to read/write the value from/to the variables of node on CODESYS PLC

[nyanko-box]

Hi, there.

I want to:

• connect OPC-UA server on a CODESYS software PLC
• get the nodes
• and read and write the values.
  But my program as following raises an error at client.get_node() method like following.

import asyncio
from asyncua import Client
from asyncua.ua.uatypes import Variant,VariantType,DataValue


async def main():
    username = "username"
    password = "password"
    ipaddress = "ipaddress"
    port = "port"

    url = f"opc.tcp://{username}:{password}@{ipaddress}:{port}"

    async with Client(url) as client:  # <- maybe this is succeeded.
        # This node is defined as a DWORD.
        node = await client.get_node("ns=4;s=|var|CODESYS Control for Raspberry Pi MC SL.Application.PLC_PRG.X201")
        
        dwfreq = DataValue(Variant(10, VariantType.UInt32))
        await node.write_value(dwfreq)
        
        client.disconnect()


if __name__ == "__main__":
    asyncio.run(main())

updating client limits to: TransportLimits(max_recv_buffer=65536, max_send_buffer=65536, max_chunk_count=16, max_message_size=1048576)
object Node can't be used in 'await' expression.

Is there any wrong in the script?
Or, do I need to some configuration on CODESYS?

Thanks in advance.

[schroeder-]

Remove the await before client.get_node.

[nyanko-box]

@schroeder-
Thank you!
I can read/write values freely!

import asyncio
from asyncua import Client
from asyncua.ua.uatypes import Variant,VariantType,DataValue


async def main():
    username = "username"
    password = "password"
    ipaddress = "ipaddress"
    port = "port"

    url = f"opc.tcp://{username}:{password}@{ipaddress}:{port}"

    async with Client(url) as client:  # <- maybe this is succeeded.
        node = client.get_node("ns=4;s=|var|CODESYS Control for Raspberry Pi MC SL.Application.PLC_PRG.X201")
        
        dwfreq = DataValue(Variant(10, VariantType.UInt32))
        await node.write_value(dwfreq)
        

if __name__ == "__main__":
    asyncio.run(main())