1 Introduction
Sintering systems are an important industrial part of steel mills. Real-time monitoring of the sintering system is the key to ensuring the normal operation of the production equipment. Establishing a stable, practical, reliable, and easy-to-operate monitoring system is the first consideration. In addition, we must consider the openness, maintainability, versatility and future development of the system. In the system design, combined with the actual needs, the current popular configuration software can not only meet the user's operational requirements, but also ensure the stability, reliability, development and advancement of the system.
2 Control system structure
The i/o communication system of the production line is divided into two layers: the upper management layer consists of workstations and engineering stations, using the most common industrial Ethernet; the lower layer is the plc of the schneider company's quantum series, from cpu, communication modules and i The /o module is composed of mb+ (modbus plus) network. The whole system has excellent scalability, users at all levels can freely expand, the upper layer can be freely added, database nodes and pipe network communication nodes, etc.; the lower layer can continue to add the middle to the communication layer, which is a typical distributed control system. The system communication schematic is shown in Figure 1.
Figure 1 System communication schematic
3 intouch monitoring system design
3.1 Introduction to the configuration software intouch
The configuration software intouch is a core component of the world's first integrated component-based mmi system developed by Wonder-ware Corporation of the United States, factory-suite2000. It features the world's leading hmi (Human Machine Interface) and object-oriented graphical development environment for efficient and fast configuration of user applications.
(1) Openness. The intouch 9.5 version runs on win3.x, win9x or winnt operating systems. The basic communication formats include fast dde and suitelink. Among them, the fast dde is compatible with Microsoft dde, so many software running under win95/98/nt system can communicate directly with intouch. In order to communicate with other devices, intouch hmi has 600 kinds of communication protocol conversion software (i/o server), which can communicate with different devices, especially in communication with plc. Including: siemens, ab, ge, quantum, and so on. You can even use a third-party server. Intouch also provides a tool to help you write communication protocol conversion software.
(2) Network function. Intouch supports Microsoft's various networks, and networking is very simple. It has powerful network functions, and can exchange data with applications in this machine and other computers in real time through traditional dde and extended netdde. At the same time, it supports access to various types of databases through odbc, which facilitates the integrated management of the system. In addition, it supports standard activex technology, making it easy for users to develop a variety of network multimedia features for their applications. Intouch, in addition to its own database, also supports the sql language, which can be easily connected to other databases.
(3) Easy to master. Intouch users can quickly and easily develop custom graphics in their processes. Users can develop and use intuitive graphics with a wide range of tools in Wonderware's windowmaker graphical editor to help users quickly and deploy visualization applications. Intouch provides a variety of powerful features, through the configuration can fully meet the user's various requirements in operation, display, and recording.
3.2 Monitoring system design
(1) Screen configuration. The windowmaker program itself provides a number of graphical symbols to choose from, simple lines, circles, polygons, etc., complex trend graphs, combination symbols, etc. In addition, you can also customize some graphical symbols, using these graphical symbols It means that the pump, fan and other equipment are connected in a logical relationship to visually represent the whole system. These graphics are then associated with variables (tags). Before using variables, first make a tagname dictionary definition. In intouch, the data is divided into memory type and i/o type. Among them, the memory type data is a variable defined inside the intouch program, and the i/o type data is generally other computer nodes or other programs running on the machine (such as i/o server), and all data from the production site is i/ The o type, to be implemented on the monitor screen, must be defined in the tagname dictionary and must correspond to the internal address of the plc.
(2) Monitoring screen design. Design monitoring screens, including process flow screens, alarm screens, flow and temperature trend screens. The operator can visually see the process flow from the monitoring screen, and can detect abnormal phenomena in time, so as to ensure the normal operation of the production. The process operation can be carried out on the corresponding screen with the mouse, which is convenient to operate and friendly in interface. The switch status of each device uses different color areas on the screen, generally gray is stopped and green is running. as shown in picture 2.
Figure 2 Monitoring the main screen
3.3 Data Communication
In intouch, the memory type is the variable defined inside the intouch program, which does not need to be accessed through the i/o server; the i/o type data is generally other computer nodes or other programs running on the machine. This type of data is used by intouch hmi. Obtained by means of netdde or dde. In the system, the data from the field in the control station (plc) is collected, and after processing, the control command is transmitted to the control station to monitor the production process. Intouch in order to achieve communication with plc, you need a communication interface - i / o server.
The upper computer is connected by Industrial Ethernet. The lower computer adopts the plc of the schneider company's quantum series, connects through the mb+ (modbus plus) network, and then connects with the mb+ network through the 174cev20040 bridge, so that it can communicate with the plc, so i/ o The server is set accordingly, and the i/o communication settings are as shown below:
Figure 3 I / O communication settings
Since the 174cev20040 bridge is used, for all topic names (each plc has at least one subject name), the "ip address" is the ip address of the bridge in Industrial Ethernet, and the "dest_index or unit_id" item. The value specifies the plc that the topic name actually corresponds to.
In this way, the i/o server can retrieve data from the lower computer. To get intouch hmi to get data from the i/o server, you need to define an access name for each variable. The access name must be the same as the topic name in the i/o server, so that the normal between intouch and i/o server can be guaranteed. communication.
4 Conclusion
By using intouch, the monitoring system is not only very simple in design and implementation, but also very powerful in function, and has high performance and stability. This design has been put into engineering practice and has realized the automatic monitoring of the whole process of the sintering system of a steel mill 90/105 workshop.
references:
[1]. plc datasheet http://
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