We are able to write data to the ctrlX CORE PLC using OPC UA nodeID but problem is that it take times. which parameter we can modify so we can get as fast as possible communication with PLC.
is there any other protocol that we can implemetn for real-time communication?
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What kind of response time are you looking for?
There are some configurable paramaters on the OPC UA Server side but I don't think they will help you here. As a non-real time communication method you shouldn't expect <50ms latency. My suggestion would be to go direct to the datalayer if possible. That will remove the OPC UA server-client latency.
If you would like true real-time, you will need to implement this in C++
See: Datalayer Realtime
OPC UA is definitely a valid solution. You just can't expect real-time behavior. Generally, this should be sufficient for an HMI application like you are describing. REST API would have similar performance here.
You could also implement datalayer communication via the SDK for the ctrlX hardware and some other solution for Siemens PLC.