Development status and trend of remote monitoring technology
Since the 1990s, with the rapid development of science and technology, people's production behavior and lifestyle have undergone significant changes. As a very important technology in life and production, the importance of monitoring technology is gradually recognized and valued by people. The evolution of monitoring system is a history of development from centralized monitoring to network monitoring. In the early monitoring system, large instruments were used to monitor the status of each important equipment, and centralized operation was carried out through the operation panel. The computer monitoring system is composed of the monitoring and control computer as the main body, together with the detection device, the actuator and the monitored and controlled object (production process). In this system, the computer realizes the detection, supervision and control functions of the production process. In the production and management of modern enterprises, a large number of physical quantities, environmental parameters, process data and characteristic parameters need real-time detection, supervision and management and automatic control. Due to the characteristics of high environmental adaptability, high real-time, and high reliability required by industrial production process control, automatic control and detection technology has been developing along its own path. The communication technologies used in the field of measurement and control are self-contained, many communication protocols are not open, and most systems are oriented to a single set or a single type of equipment.
With the progress of productivity, the distribution of equipment is becoming more and more discrete and single, and their independent monitoring systems can no longer meet the needs of industrialization, so distributed systems have emerged. This system is based on computer network, which makes the system resource allocation more reasonable. However, most of the distributed monitoring systems currently in operation are only on the LAN, and the usual measurement and control are only limited to the same location, so they have regional limitations. The Internet can realize the sharing of resources, thus enabling people to solve problems that were difficult to solve under extremely limited resources, and providing favorable conditions for the development of remote monitoring systems [1]. Remote monitoring is that the local computer monitors and controls the remote through the network system such as Internet/Intranet to complete the status monitoring of the decentralized control network and the diagnosis and maintenance of equipment. We usually call the communication media, computer software and hardware systems that can realize remote monitoring the remote monitoring system. In the situation where the field equipment is widely distributed or the data is not easy to collect, it is necessary to be able to monitor the running status of the equipment in time and carry out effective control, which is the demand of remote monitoring technology in industrial production.
Function analysis of remote monitoring system
There are two types of remote monitoring systems. One is that there is no on-site monitoring system at the production site, but the data is collected and sent directly to the remote computer for processing. This kind of remote monitoring is not much different from the general on-site monitoring, but the data transmission distance is farther than the on-site monitoring system, and other parts are the same as the on-site monitoring system; The other is the coexistence of on-site monitoring and remote monitoring. Generally, the field bus technology is used to connect the sensors, monitoring devices, etc. distributed in various devices, so that the discrete unit stage enters the integrated unit stage, and then the services of various management sites are connected with the LAN, thus forming an enterprise intranet. With the establishment of the basic network information infrastructure, equipment monitoring and maintenance technology has entered the stage of integrated system, which basically realizes the sharing of resources and information within a unit.
The functions of remote control are as follows:
Acquisition and processing function: it is mainly used to detect, sample and necessary pretreatment of various analog or digital quantities in the production process, and output them in a certain form, such as printing reports, display screens and televisions, to provide detailed data for production personnel to help them analyze, so as to understand the production situation;
Supervision function: analyze, summarize, sort out and calculate the real-time data detected, as well as the instructions and input data issued by the production personnel during the production process, and store them as real-time data and historical data respectively;
Management function: use existing effective data, images, reports, etc. to analyze working conditions, diagnose faults, predict dangerous situations, and alarm faults and emergencies in the form of sound and light;
Control function: information processing is carried out on the basis of detection, and control output is formed according to the predetermined control strategy, which directly acts on the production process.
Wuxi Dehang Technology Co., Ltd., founded in 2010, is a computer network system integration and weak current engineering service company in z industry.
For many years, the company has been committed to information system integration, Internet/Intranet software development, building a technical service network covering the whole country, and providing a complete set of solutions for large, medium and small users such as early planning, scheme design, application development, system installation, debugging and personnel training of information systems and weak current systems. So far, it has provided hundreds of large and medium-sized computer network systems and weak current engineering solutions in the fields of finance, insurance, securities, power, banking, civil aviation, railway, water conservancy, petrochemical, national defense, customs, telecommunications, scientific research institutions, etc.
