DIRECTLY CONNECTED DISPLAY OF PROCESS CONTROL SYSTEM IN AN OPEN SYSTEMS WINDOWS ENVIRONMENT

摘要

In a display for a process control system, the display canbe generated by one of two different sources, but is controlledby only one of them. A process control system network provides afirst source of display, while a windowing system provides asecond source. The control system network provides crucialinformation to the display regarding the operation of the processcontrol system. Alternatively, the windowing system allowsdisplays to be generated from a variety of sources includingexternal computer systems. The windowing system controls thedisplay by opening and maintaining windows. One specific windowto be opened is a window in which the control system network candisplay information. To allow the control system network tocommunicate information, a window is opened by the windowingsystem, and then the process control network is allowed tooverwrite information into this newly opened window.Also, should the windowing system fail, control of the display isgiven to the control system network.