SIMATIC WinCC Server / WinCC Client (TIA Portal)

Setup of a multi-user SCADA system


With the help of the options WinCC Server and WinCC Client, several operating and monitoring stations can be operated in a coordinated manner in the network with linked automation systems. In such a client/server architecture, one server can supply up to 32 connected clients with process and log data, alarms, screens, and reports. The prerequisite is a network connection (TCP/IP) between the computer (server) and the connected clients.


Suitable protective measures (among others IT-Security, e.g. network segmentation) have to be taken up to ensure a safe operation of the plant. You find further information about the topic of Industrial Security on the Internet under


  • Integrated scalability from the single-user system tothe client/server solution

  • Cost-effective solution for SCADA applications of medium complexity

  • Low-overhead configuration of a distributed operating station


A multi-user system with a server is used whenever the same process is to be monitored at several operating stations. The result of an operator action at one operating station, e.g. the changing of a value, is immediately available to all of the other operating stations. Multi-user systems are typically found at small and mid-sized plants in which distribution of data to several servers is not absolutely required.

Configuration and task distribution
WinCC clients display the data from exactly one WinCC server with a process connection. The WinCC server supplies the connected WinCC clients with the configuration, process and log data, alarms, screens, and reports.

All WinCC data is stored in the integrated Microsoft SQLServer database on the WinCC server. The WinCC clients access the WinCC configuration data on the WinCC server.

By assigning access rights, it is specified which functions or plant sections are available to a user on which operator control stations. The configured operator authorizations are user-related, not computer-related. An assigned operating authorization is therefore valid for all operating stations with the same login.

The client-server technology makes it possible to easily separate WinCC clients from the WinCC server: The project is created centrally on the engineering station and loaded onto the WinCC server with a process connection.

The WinCC server automatically takes over the supplying of the WinCC clients with a Runtime environment, screens, process values, alarms, log data, and reports. The coupling to the automation system, the communication and coordination of the clients, and all of the archiving is done via the server.

The WinCC clients only need one configuration. In the "Devices and Networks" editor of the TIA Portal,  the clients are linked to the server via drag & drop. Then the start screen, the Runtime language,  toolbars, navigation keys, and window properties are assigned for each client. If necessary, specific key combinations can be blocked.

Process specifications or alarm acknowledgments on one operator station are consistently available to the other operator stations.

The following licenses are required for setting up a multi-usersystem::

  • In addition to the WinCC Runtime Professional license, there is also a WinCC Server license on the server

  • A WinCC Client license on each client