title: Is OPC UA the best way of getting data from many Scada systems?
body: <p>In my company we have many distributed sites and each one uses a singular Scada system vendor (one uses Wincc, other place uses another...) and this systems works with almost the same kind of information.</p>
  
  <p>We need to retrieve some general data from these systems so I'd like to know if OPC UA can handle it.</p>
  
  <p>Is it possible to buy or develop an OPC UA Server that retrieves data from Scada systems to a client through Web Services?</p>