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The operation station of the central control room is actually a personal computer interface. On the one hand, it processes and processes various production information collected by the control station, and then provides it to the operator in the form of various process pictures, production reports, historical trends and sound and light alarm which operators are accustomed to and familiar with. On the other hand, the operator&＃39;s instructions are encoded and sent to the operation station to adjust the control scheme to optimize the production process or emergency treatment of special situations. For small and medium DCS, the popular monitoring software can realize this function, and there is no special requirement for the hardware and operating system of the computer. It can be realized by adding a set of monitoring software with a common PC.

When the PC and PLC are used to form the distributed control system, PLC takes on the work of the field control station, and the PC takes on the work of the operation station and the engineer station. On the PC with PLC system software installed, the PLC control application software (generally referred to as ladder chart) can be edited offline (or online). After the control application software is downloaded to PLC, PLC can independently complete the field data collection, logic control, analog control, etc. All functions of the operation station can be realized by "real-time monitoring software" + "PC", and it can be easily monitored on the PC with real-time monitoring software installed. 2. a case study of DCS realized by PC and PLC 2.1. process introduction: