Process automation system

In process automation systems, operating and monitoring equipment performs the operation and monitoring of processes in control technology, as well as archiving and documenting the process values generated and process messages from subordinate automation systems. In order for a process to be monitored and optionally operated simultaneously by multiple operators, client-server concepts are used today, where the server, also known as the host station or host computer, performs all the computing, and the clients, also known as terminals, are responsible only for graphic output and permit operator input and change of displays by using a mouse and keyboard. At the host station there is a process bus which establishes the connection with the automation equipment and a terminal bus which establishes the physical connection with the terminals. The host station and terminals are usually located in the control room or adjacent rooms. A process automation system includes terminals for operating and monitoring purposes, automation devices for executing control functions, and a host computer. Communication between the terminals and the automation devices is exclusively established via the host computer. The host computer may be installed remotely, in a computing center.