1. System Concept
The development of information technology will certainly promote the revolution of automation systems. With the development of information technology, the applications in various fields are also maturing. The industrial automation system will undergo major changes in the overall architecture, management mode, application technology, comprehensive mining, etc. The overall goal of moving forward. In particular, the introduction of the concept of the Internet of Things has enabled more and more enterprises to design target monitoring, data applications, and open interconnection as a complete solution.
Internet of Things (IoT) is a type of information sensing equipment such as radio frequency identification (RFID) that uses the Internet for information exchange and communication according to agreed protocols to achieve intelligent identification, positioning, tracking, monitoring and management The internet. The functional characteristics of the Internet of Things are comprehensive perception of information, reliable transmission of information and intelligent processing of information in order to achieve intelligent control and management of objects.
SCADA (Supervisory Control And Data AcquisiTIon) system is supported by computer and network technology to realize on-site data collection, equipment control, data measurement, parameter adjustment and signal alarm. The application of SCADA system has been very mature, and its application has completely exceeded the scope of basic data monitoring and control. A complete SCADA system has not only realized simple data collection and remote control functions, but has been given a richer connotation.
2. System characteristics
2.1 Internet of Things system
The Internet of Things system uses a computer Internet platform and relies on radio frequency automatic identification (RFID) technology to realize automatic identification of terminal nodes and interconnection and sharing of information. The Internet of Things can be divided into three layers: one is the perception layer, that is, the skin and facial features of the Internet of Things recognize objects and collect information; the second is the network layer, that is, the transmission and processing of the neural center and brain information of the Internet of Things; The deep integration of the Internet of Things and industry expertise, combined with industry needs, to achieve industry intelligence.
2.2 SCADA system
The general SCADA system can be divided into three layers. The first layer is the data acquisition layer, which is composed of RTU and primary instrument, which completes the collection and preprocessing of the original data on site. According to the design requirements, on-site data storage can also be achieved to ensure the continuity of data after communication is interrupted; the second layer is the data monitoring layer. At this level, various software will be used to simulate the site remotely to realize real-time data monitoring and real-time alarm. This layer can be divided into sub-control center and general control center according to the corresponding management mode. It can also store a large amount of historical data according to the design requirements; the third layer is the data application layer. At the application layer, the collected data can be analyzed and sorted, and various forms of release can be implemented as needed. Many companies in the industry have extremely stable products and rich system integration experience in the data acquisition layer, data monitoring layer, and data application layer.
2.3 Other layers
For the architecture of industrial automation, there is also a layering theory that is also three layers. The first layer is the basic automation layer represented by PCS (Process Control System). Mainly includes control software, measurement technology, database technology, data fusion and data processing technology, DCS, FCS, sensor technology, special execution agencies, etc .; the second layer, the production process represented by MES (production process manufacturing execution system) Run the optimization layer. The main content includes modeling and process simulation technology, advanced planning and scheduling technology, real-time optimization technology, dynamic cost and management technology, etc .; the third layer is the enterprise production and management optimization layer represented by ERP (Enterprise Resource Management). The main content includes enterprise resource management, supply chain management, product quality data management, data warehouse technology, equipment resource management, enterprise e-commerce platform and so on.
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