title: How to read signals from PLC using opc ua?
body: <p>I have a node-opcua server running on my machine. I want to read data from PLC.
  From my understanding, OPC Server is used to read/write on PLC. </p>
  
  <p>I have followed the instruction to create server and client from <a href="http://node-opcua.github.io/" rel="nofollow noreferrer">http://node-opcua.github.io/</a></p>
  
  <p>So, my question is how to read signals from PLC? I am new to IoT and OPC UA. Please guide me.</p>