the design of the remote electric control automation system based on embedded

The design of the remote electric control automation system based on embeddedPick to: based on the traditional distributed control mode in the distance with insufficient set in the control system of remote electric automation control system was designed using the industrial Ethernet, and combined with embedded systemsDeveloped which has the function of remote controlelectrical automation control system, and gives the network architecture of the embedded remote electrical control system, control is implemented and embedded system design scheme, to further improve based on embedded system of remote electric control automation control system has a certain reference significance.Keywords: embedded control electrical automation remote measurement and control systemAt present although many mechanical and electrical equipment factory electric control is achieved, but still USES the decentralized control to manage the mechanical and electrical equipment. If adopt the form of a local area network (LAN) to build a ring of all mechanical and electrical equipment within the facility, all mechanical and electrical equipment through the network to realize the remote control, so will greatly improve the mechanical and electrical equipment control integration performance, not only can realize local electric control all mechanical and electrical equipment in the factory, also has realized the remote control at the same time, in the central control center can build for these different electromechanical equipment specialized expert fault system, for different equipment of different fault types provide corresponding emergency control measures, thus greatly improving thelevel of modernization.A traditional way of collecting and distributing control (DCS) analysis of the DCS system is with the constant rise of modern large-scale industrial production automation and process control requirements of increasingly complex arises at the historic moment of comprehensive control system, it is system control technology, computer technology and network communication technology and the combination of multimedia technology, can provide window friendly man-machine interface and powerful communication function, is to complete the process control, process management, modern equipment. Due to the development of the technology and equipment to improve the reliability of the used in process control of industrial process control station are becoming increasingly large scale, function has become increasingly concentrated, field signal detection, transmission and control adopts ma 4 ~ 20 ma analog signal, which is the idea of "decentralized control, centralized monitoring" violation. As the complexity of electrical equipment, function has become increasingly diverse, DCS control mode has exposed the problem more and more; For the remote control system based on industrial Ethernet really do this, put control completely underground in the scene, the scene2 remote electronic control automation system based on embedded design implementation. 2. 1 remote controlfunction is implemented in the remote control system based on industrial Ethernet, each node is A digital intelligent equipment, these devices have A built-in microprocessor, with sampling, A/D conversion, linearization, correction, computing and PID control, alarm, judgment, just according to the control system structure and control strategy of the function block required and have the function of library condition, distribution function block, through the configuration software, complete the connection of function block, can easily achieve A variety of conventional control scheme, thus lowering the original DCS standing in A large number of simple control functions to the scene, realize the real distributed control. In an actual remoteelectrical automation control system design, the control variables and large amount of logic control, mainly is the auxiliary engine start-stop process related equipment shall be carried out in accordance with the order of moves, equipment protection, interlock and sequence control, etc.; In addition, the technological process of auxiliary workshop is given priority to with sequence control, PLCfor sequential control has its unique advantages. PLC selection should be to follow the communication protocol or to exchange information of communication and network as the optimization object. In electrical automation control, analog control and logical control is not separated, each of whether the equipment investment and running are influenced by other device status and conditions and constraints, is controlled by the system and the running situation of the whole system. 2. Level 2 remote control system architecture design: (1) remote information management integrates all the mechanical and electrical equipment control function, on the basis of the underlying transport integration and data integration, realize the dynamic display of the various integrated subsystem, the main features include: supporting mechanical and electrical transport equipment "control integration" management, a mechanical and electrical equipment management informatization and the real combination of production automation. Through the integration of control system mechanical and electrical equipment scheduling and safety production operation instructions, able to respond to various emergencies. Can all kinds of information, the system integration and production related data real-time acquisition in the control server, which reflects the control of the real time information and correlation. Through a number of monitoring stations set up on the spot and set to big screen in the center of the remote monitoring management, to be monitored all the mechanical and electrical equipment operation condition of the comprehensive monitoring and command. Layer: (2) the network structure of optical fiber industrial Ethernet,main function is to access different protocols at the same time (subsystem) refers to the integration of data in the data transmission platform provides Ethernet and fieldbus transmission link, realize the network data transmission and exchange. Layer (3) equipment: associated directly with the alleged mechanical and electrical equipment, the operation of the local unit equipment control and protect the basic function, according to local control state information; At the same time can through local area network (LAN) with the remote information management of the central control building two-way transfer 2. 3 embedded in the design of control of the development of the system software platform, the embedded real-time operating system mu Clinux system more tasks for scheduling and management. Based on real-time multitasking operating system, the application of real time depends on the processing of tasks and interrupt. Users according to the need to call mu Clinux task scheduling functions, from the ready tasks scheduling function to find the highest priority task, and task switching operations. In accordance with the principle of task partitioning, in combination with electrical automation remote of the specific requirements of the system, the application software is divided into the following categories: (1) the tasks of measure-control basic function of task: include measuring, data preprocessing, driven by output, etc. Such tasks, reliability, high real-time performance, so the highest priority, to measure the highest priority. Data preprocessing is according to the requirements of the sampling data as a low pass filter. (2) protection mission: mainly alarm function. Request as soon as possible. (3) the human-computer interaction function: the keyboard response, display, etc. The most priority The local data collection procedures to external signal acquisition, and collected data to the data processing module; Data processing module for digital filtering, data storage module is responsible for the public of the buffer data according to certain format to Flash; The keyboard module provides the user tocontrol the equipment at the scene of means, is used to set the parameters of the work service program is actually made up of two parts: an embedded Web server and a CGI program. Embedded Web server as a daemon in the background. Responsible for monitoring customer requests from network. When the user request to the local system through IE browser, launch the corresponding CGI program, the request into the server can recognize format, after processing, again by CGI convert the results into a Web browser can recognize format, as the HTTP response message back to the client, so as to complete the client interactions with local system3 conclusionThe development of embedded real-time system is a very complicated process, in addition to balance therelationship between hard and soft after the analysis of the initial requirements, more time in the system flexibility, speed, cost, the trade-off between plan and available tools. We developed the embedded system based on Linux application remote electrical automation control system, can satisfy the current request for measurement and control system of industrial control field, to ensure the real-time performance and the reliability of the measurement and control task to complete, can be connected to the remote monitoring of industrial Ethernet, the hardware interface in the form of board, simple structure, easy to loading and unloading, convenient systemintegration and maintenance; Software, users can according to specific application accordingly modify, or delete, thereby enhancing the efficiency of the development of measurement and control system, has a good application prospect in the field of industrial control.。