A differentiation is basically made between the following types of application when operating and monitoring SIMATIC PCS 7 systems via the Web:

• Standard:
  Up to 50 PCS 7 web clients access the data of one PCS 7 web server over intranet/Internet.
• Diagnostics:
  One or only a few Web clients have access to several PCS 7 Web servers/single-user systems for remote operation, diagnostics or monitoring.