Design and Application of Fieldbus Control System in TKT Project

Abstract: The design and application information of the fieldbus control system in the TKT project is provided by the excellent manufacturers of flowmeters and flowmeters. 1. Overview TKT is an energy-saving and environmental protection project, which is the abbreviation of 'Blast Furnace Gas Residual Pressure Energy Recovery Turbine Power Generation. The computer control system of the 2500m3 blast furnace TRT project of Baosteel Group No. 1 Steel Company (hereinafter referred to as No. 1 Steel Company) was designed by Wuhan Iron and Steel Design and Research Institute. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the design and application of the fieldbus control system in the TKT project. 1. Overview TKT is an energy-saving and environmental protection project, which is the abbreviation of 'Blast Furnace Gas Residual Pressure Energy Recovery Turbine Power Generation. The 2500m3 blast furnace TRT engineering computer control system of Baosteel Group No. 1 Steel Company (hereinafter referred to as No. 1 Steel Company) was designed by Wuhan Iron and Steel Design and Research Institute. At the beginning of the design, the user put forward special requirements different from the conventional TRT control system: (1 ) using the field bus control system FCS. (2) Set up a TRT operation station in the blast furnace main control room so that the TRT workshop is unattended during positive production. After nearly half a year of design, programming and debugging, the project was successfully put into production in March 2003. 2. FCS system configuration In the design of the TRT project of No. 1 Steel Company, according to the characteristics of gas differential pressure power generation, the field bus technology is required not only to be mature and reliable, but also to be a redundant structure as much as possible to ensure that the construction of TRT does not affect the main blast furnace production. . Therefore, through the comparison and screening of several field bus control systems, it is determined that the combination of Siemens' PROFIBUS and AS-I field bus and the corresponding instrumentation devices are used, and the control system adopts PCS7. The FCS hardware is mainly composed of a control station, an operation station, and a communication system that connects the two and external communication. The specific configuration is shown in Figure 1. 2.1 Control Station The control station includes the main CPU and 7 extended I/O stations (DPll-DPl7). According to the needs, the remote I/0 station (DPl3-17) is scattered on the site and in the blast furnace main control room, which is 600m away from the TRTT control room. The controller can realize sequence control, logic control and loop control, including logic operation, arithmetic operation, PID adjustment, function generation and ramp generation related to loop control, etc. There are more than 200 function blocks in total. In order to ensure the high reliability of the system, the controller CPU (AS 417-4H), the communication module and the high-speed communication bus are in a one-to-one redundant mode. The fast response and mutual switching time of the redundant CPU meet the normal production and safety protection of TRT. Require. Part of the switch input/output equipment of this project is complete with the process and has no bus interface; the output of special detection instruments (such as vibration measuring devices) is still 4~20mADC analog signal, so the design also uses local I/O stations (DPll, DPl2) And remote I/O station (DPl3-DPl7). DP11 to DP17 are connected through PROFIBUS-DP bus. The configuration, programming and debugging of the controller and the remote I/O station are completed by the operation station/engineering station, and the online download is carried out through the communication bus. There are many ways to program, namely function block, instruction list, sequence control diagram and ladder diagram. According to the characteristics of the TRT control system, these methods can be combined flexibly. 2.2 Operation Station The operation station consists of two sets of 21' high-resolution flat-screen color displays, industrial control machines, printers, etc. The operation station can also be used as an engineer station. The two operation stations are respectively set in the TRT control room and the blast furnace main control as required. In addition to the slightly different content of the 'Startup Screen', the content and operation methods displayed by the two operation stations are exactly the same. TRT control room operation station is mainly used for debugging. The monitoring software adopts SIMATIC PCS7 OS V5.1, which works on the Windows NT platform, and monitors the process data collected from local and remote I/O stations, PROFIBUS PA and AS-I fieldbus systems in real time through rich and perfect simulation screens. , and carry out related process operations at the same time. In addition, the operator station also realizes the following main functions through programming and configuration:·Alarm function: The alarm log provided by the monitoring software records events, information and alarm status in milliseconds, responds accordingly according to the alarm level, and classifies and archives or triggers related actions (such as printing) as required.·Security function: The user manager provided by the monitoring software allows to set a variety of user permissions, set the corresponding encryption level for different operators, and record the important operation process of the operator.·Data management: The label log and report editor provided by the monitoring software can record, display, print and copy the historical trend values ​​of important parameters to facilitate data search and fault analysis. 2.3 Communication bus There are four kinds of communication bus, namely Industrial Ethernet, PROFIBUS-DP, PROFIBUS-PA and AS-I. (1) Industrial Ethernet It is used for communication connection between TRT operation station and control station, TRT operation station and blast furnace main control room operation station. Ethernet is an open, high-speed, redundant structure, and the communication speed is l0M/s. The communication between the two operating stations adopts ring fiber, and the distance is about 600m. The communication between the operation station and the control station adopts the coaxial cable and the corresponding communication card (CP443-1 and others use the connector OLMITP62 transition between the ring optical fiber and the coaxial cable. The operation station and the control station are set different addresses through software. number to identify.

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