The key to realizing virtual dcs is to develop intelligent compilation and conversion software and establish a virtual operation technology platform. The intelligent compilation conversion software and algorithm module software are developed by using general-purpose Visual C++6.0 tools and can run on the open Microsoft Windows platform, so that they can be connected to the management network of the factory-level SIS, MIS and simulation systems. The virtual DCS is applied to reproduce the DCS function on a platform such as UNIX. Together with the process math model, the virtual DCS becomes a ready-to-use inspection and diagnostic technology tool for running analysis and troubleshooting managers' desktop computers.
The software technology development of virtual DCS requires a comprehensive and unified software method to process the configuration information of various real DCSs. Its substantive work is no less than the preparation of several DCS software running system software. The specific technical means and methods for realizing virtual DCS are various, and the software packages of various R&D institutions are also different. The author of this paper believes that the core of software technology of virtual DCS is nothing more than the following components:
(l) DCS technical data - Because the virtual DCS is to develop the underlying simulation program for DCS, it is necessary to refer to the complete DCS underlying technical data, the hardware and software system structure, configuration method, algorithm module, system management of DCS, Database management, file management and communication protocols are well understood. After technical training from DCS manufacturers, technical support from DCS manufacturers is even available to solve problems that may arise in virtual processes.
(2) Intelligent scanning interpretation——The intelligent compilation and conversion software of virtual DCS firstly interprets the downloaded file code after real DCS configuration or modification. Since these codes have no standard and unified mode, they are produced by each DCS manufacturer. Different definitions of special-form assembly language, so the scanning and interpretation of them need to have certain intelligent judgment functions, and intelligently interpret and deal with the special content such as connection, communication, redundancy, fault tolerance, exception, system management, etc. . Once the scan is complete, a complete virtual DCS configuration semantic library can be created to provide source data for uniform code conversion and output.
(3) Automatic code generation——The problem faced by virtual DCS is that the downloaded files before conversion will come from different DCS systems, and the converted code should be suitable for different simulation or analytical calculation program requirements. The best solution is to explain by scan. The resulting configuration semantic library automatically generates standard and formal Visual C++ 6.0 program code files, and then considers special handling in the interface program module. Automatically generated content includes database definitions, initialization definitions, signal connection definitions, instantiation definitions between algorithm module classes, module group definitions, interface definitions, and more. Automatic code generation requires no manual intervention, no manual modification, and continuous batch completion.
(4) Program compilation and debugging - The virtual DCS program compilation system is based on the standard C++ compiler. It has strict syntax and connection checking functions. If there are semantic logic errors, data type errors, or lack of connection definition, the system will Submit an alarm or troubleshoot the information.
(5) Virtual parameter database——The parameters of virtual DCS include input output variable, controller parameter, network variable, human-computer interaction variable, etc. The data type includes analog quantity, switch quantity, integrated quantity, character quantity, etc. Do additions, deletions, changes, definitions of Chinese descriptions, etc.
(6) Virtual algorithm module library——DCU control algorithm module of virtual DCS should be developed according to the module defined by real DCS. Each DCS has about one hundred module types, including input output module and analog control module. Logic control model, sequence control module and special calculation module. It requires the object-oriented real-time control system module programming technology to create a virtual DCS algorithm class, embodying the advanced software technology features of encapsulation, inheritance and polymorphism.
(7) Human-machine interface component library - If the simulation hmi scheme is adopted, the third-party human-machine interface drawing configuration software is used for development. If you use a virtual HMI solution, you need to develop dynamic components of various human-machine interfaces, including data display, status display, buttons, graphs, bar graphs, and soft hand-held devices. The caller of the component library also requires automatic generation or implementation with less manual intervention. Pay special attention to the built-in logic program or script program that generates the same functions as the real DCS to ensure the fidelity of the virtual HMI.
(8) Process model interface—The virtual DCS must retain all DCS input and output measurement point numbers, and the connection with the mathematical model of the process object can also simulate the installation measurement point and commissioning project on site.
(9) Real-time scheduling function - Virtual DCS is also a real-time program, which needs to perform real-time scheduling at runtime. It is required to retain the same time slice and real-time scheduling combination of real DCS during compile conversion to make the virtual HMI fidelity.
(lO) Virtual Simulation Application Function - Virtual DCS is developed and run on a general and open computer software platform, so it can be connected to a real DCS system, or it can be closed-loop with the process mathematical model system, and can also be used with SIS. The system real-time data or historical data is networked to implement complex virtual simulation application functions such as fast memory, initial conditions, interface, check, return, replay, comparison, statistics, prediction, simulation, and optimization.
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