The development process of distributed control system DCS is mainly the process of using system configuration software to generate various application software according to the actual needs of the control system. The configuration software functions include basic configuration configuration and application software configuration. Basic configuration configuration is to give the system a configuration information, such as the number of various stations in the system, their index marks, the maximum number of points of each control station, the shortest execution cycle and memory capacity, etc. The configuration of application software includes relatively rich content, mainly including the following aspects.
The configuration of control loop is essentially to use various basic functional modules provided by the system to form various actual distributed control systems. At present, the configuration methods provided by various distributed control systems DCS are different. In summary, there are designated operation module connection methods, determination table methods, step recording methods, etc.
The designated operation module connection method is to call various independent standard operation modules, connect them into various control loops with lines, and finally automatically generate control software. This is a configuration method with very intuitive information flow and control functions. The determination table method is a pure form of filling in the form. As long as you fill in the content or answer the questions item by item according to the requirements of the configuration form, this method is very conducive to the user's configuration operation. The step entry method is a writing method based on language instructions. It has a large degree of programming freedom. Various complex functions can be realized through some skills, but the configuration efficiency is low. In addition, since this configuration method is not intuitive enough, it often has high requirements on the technical level and configuration experience of configuration engineers.
The real-time database is the most basic information resource of the distributed control system DCS. These real-time data are stored and managed by the real-time database. In the distributed control system DCS, there are many ways to establish and modify real-time database records. The commonly used method is to generate database files with general database tool software. The system directly uses this data format for management or adopts some method to convert the generated data file into the format required by the distributed control system DCS.
