Lead: Under certain conditions, in industrial automation, accurate positioning of data is needed. It has a very broad development prospect in the field of measurement, especially in underground detection. The following is a model essay on wireless technology in the field of industrial automation that I compiled for you. I hope you like it. For details, please visit (www.oh 100.com/bylw).
This paper summarizes the methods and characteristics of wireless technology in industrial automation, and probes into the application effect and new development trend of ultra-wideband wireless communication technology in industrial automation, which has certain reference value for guiding the application of wireless technology in industrial automation.
Industrial automation, field, wireless technology
I. Introduction
In recent years, wireless technology has made rapid development in the field of industrial automation in China, but there are still some problems and deficiencies that need to be improved. This paper analyzes the main problems of wireless technology in the field of industrial automation, and studies the innovative strategies of wireless technology in the field of industrial automation, which is of great significance for accelerating the pace of industrial automation.
Second, the technical characteristics of Z igbee
Z igbee is a two-way wireless communication technology with short distance, low complexity, low power consumption, low data rate and low cost. In a specific environment, Zigbee is mainly suitable for the fields of automatic control and remote control, which is formulated to meet the wireless networking and control of small and cheap equipment. Z igbee is the commercial name of IEEE 802. 15. 4 technology. At the same time, the core protocol of this technology consists of IEEE 802. 15.4 working group was established in February 2005. But Zigbee Alliance is responsible for high-level applications, interconnection testing and marketing. Then the research problem is that Z igbee Alliance was established in September, 20001year, and now there are more than 100 well-known enterprises, including British Invisible Company, Japanese mitsubishi electric Company and American Motorola Company. To some extent, Z igbee's protocol is mainly composed of physical layer, data link layer, network/security layer, application framework and high-level application specification. Among them, IEEE 802. 15.4 is responsible for the standards of physical layer and data link layer; Based on this, Zig-bee Alliance is responsible for the research and development of network layer and application layer. The Z igbee protocol stack is shown in figure 1.
The main features of Z igbee technology are: 1. Low power consumption. Under the standby condition of low power consumption, two ordinary No.5 dry batteries can be used for more than 6 months, which is a specific advantage of Zigbee supporters. Second, the data transmission rate is low. Only 10~ 250 kb/s, focusing on low transmission applications. Third, the cost is relatively low. Z igbee has low data transmission rate and simple protocol, which greatly reduces the cost. To this end, it is estimated that by the end of this year, the price of Zigbee chips may drop to $3. Fourth, the network capacity is relatively large. Statistics show that the network can accommodate 65536 nodes. Fifth, the effective range is relatively small. The effective coverage range is between 10~ 75 m, which is determined according to the actual transmission power and various application modes in some cases. Sixth, the working frequency band is very flexible. To some extent, the applied frequency band is 2. 4GH z (global), 868MH z (Europe) and 9 15 MH z (USA) are all unlicensed. Seven is safe and applicable. Z igBee provides data integrity check and authentication functions, and adopts AES- 128 encryption algorithm. Eight is honest and reliable. Anti-collision measures are adopted to reserve special time slots for communication services that need fixed bandwidth to prevent competition and conflict when sending data. Nine is a short delay. Z igbee's communication delay and activation delay from sleep state are very short. The typical time for device search is 30 ms, the typical time for device activation is 15 m s, and the access time for active devices is15 ms. On this basis, Z igbee is mainly used between many electronic devices with low data transmission rate, such as medical treatment and industrial control. The most typical application is automatic meter reading system. Therefore, at present, the cost of GPRS/CDMA wireless meter reading system is relatively high, and it is necessary to pay a certain fee to telecom operators, while another power line networking (PLC) technology is not stable enough. Accordingly, in comparison, the meter reading system using Z igbee network is built by the Electric Power Bureau itself, and to some extent, it does not need additional fees. In addition, the ultra-large capacity of Z igbee network can generally meet the needs of coverage, so Z igbee has broad development prospects in the field of wireless automatic meter reading. At the same time, Zigbee also has great advantages in underground wireless monitoring, industrial environment temperature and humidity monitoring, sewage monitoring, gas monitoring and so on. Under special conditions, due to the development of sensor and communication technology, the concept of wireless sensor network (WSN) has been deeply rooted in people's hearts. Zigbee has incomparable advantages in the application of wireless sensor networks. To some extent, wireless sensor network is also a multi-hop self-organizing network system composed of a large number of cheap micro-sensor nodes deployed in the monitoring area through wireless communication. Therefore, it has many advantages such as high monitoring accuracy, strong fault tolerance, large coverage area and remote monitoring. WSN can be applied to industrial automation system, equipment fault diagnosis, production process monitoring in harsh environment and so on. At the same time, the primary goal of wireless sensor network design is the efficient use of energy, that is, under the condition of ensuring the normal monitoring function, it consumes as little energy as possible and prolongs the life cycle of the network. Based on this, it is consistent with the design goal of Z ig-bee. Secondly. Sensor networks strictly require that the cost of each node be as low as possible, and the requirements are very strict. Only in this way can a network have more nodes, and when a single node fails, it can quickly re-plan and determine the route so as not to paralyze the network. Thirdly, Z igbee network can accommodate more than 65,000 nodes at the same time, which is enough to ensure the collection of multi-source data. Under certain conditions, sensor networks usually include sensor nodes, sink nodes and management nodes. At the same time, sensor nodes are generally composed of four parts: sensor module, processor module, wireless communication module and energy supply module. It is a micro embedded system, which takes into account the dual functions of terminal and router of traditional network nodes. The architecture of the sensor network is shown in Figure 2.
The sink node connects the sensor network and the external network to realize the communication protocol conversion between the two protocol stacks. On this basis, the monitoring task of the management node is released and the collected data is forwarded to the external network. Therefore, users configure and manage sensor networks through management nodes, issue monitoring instructions and collect monitoring data. At the same time, according to the composition of the sensor network, Zigbee nodes can be used as sensor nodes of the whole network to form a Zigbee network in the whole monitoring area, and each sensor node is embedded with a Zigbee protocol stack to realize the basic Zigbee network functions. At the same time, the collected data are transmitted to the sink node, and the tasks and commands sent by the sink node are also accepted. To a certain extent, a microprocessor +GPRS module is used as a sink node to connect the sensor network and GPRS network, realize TCP/UD P and other protocols, package data into frames, transmit them to the main control room through GPRS network under certain conditions, unpack the commands from the main control terminal, and then transmit them to the sensor node. The GPRS module is connected to the client and forms a hardware platform with the PC server, and the software includes a database. In this process, the received data will be carefully analyzed and the whole network will be managed. In some cases, Z igbee's own characteristics determine that it can only be used under short-distance and low-speed conditions. In industrial monitoring, we must pay attention to the workflow, and a lot of time needs real-time images, which requires high-speed data transmission rate. Therefore, Zigbee has fatal shortcomings in this regard. The emergence of ultra-wideband technology makes this application requirement possible.
Third, the application effect of ultra-wideband wireless communication technology in the field of industrial automation
Analysis of 1 Ultra-wideband wireless communication technology.
Under certain conditions, UWB wireless communication technology is a communication mode in which the carrier is replaced by pulses with extremely short time intervals. At the same time, it has the following advantages: first, it has strong anti-interference ability, which is mainly the characteristic of this technology. Under certain circumstances, all the frequency bands of this technology and the frequency bands currently used in China's communication system are safe and do not interfere with each other. In some cases, once the signal is transmitted, the transmitted radio pulse signal is not only very weak, but also the output power is relatively low; Second, it has the characteristics of high transmission rate and low energy consumption. Compared with Zigbee, in some cases, its transmission rate is much higher than that of Zigbee, which may be as high as hundreds of megabytes per second at the highest, and its energy consumption is very low, mainly because it can't use carriers when transmitting, and only consumes very low energy when transmitting pulses. Third, it has a high security function. As far as wired technology is concerned, security and stability are greater than wired communication technology. This technology is integrated with time-hopping spread spectrum technology to a certain extent, so the information data receiving equipment can only receive the transmitted data on the premise that the transmitting end knows the spreading code, and the transmitted power spectrum density is low, which is not received by the usual information data receiving equipment. Therefore, it shows its security function; The fourth is the comparison of positioning advantages, which is mainly due to the good positioning advantages of the system itself. Under certain conditions, the permeability is very strong. Therefore, it has relatively accurate positioning performance, and the accuracy can be as high as 10 meter. Because of this, this is also an incomparable advantage of other communication technologies. Fifth, it has powerful multi-path analysis function. Compared with the general wireless communication technology, its multipath propagation effect greatly enhances the communication quality and data transmission speed to a certain extent.
2. The application of ultra-wideband wireless communication technology in the field of industrial automation.
This paper analyzes the origin of ultra-wideband wireless communication technology. At first, it was mainly used in the field of military radar, and it was used to develop military radar technology under certain conditions. Since March 2005, UWB technology has been approved by the United States for use in non-military fields. Since then, UWB technology has made new breakthroughs and been more and more widely used through scientific inventions. From the analysis of UWB technology, under certain conditions, it is said that its transmission rate is high. Therefore, it has obvious advantages in industrial automation and has been widely used. Under certain conditions, in industrial automation, it is necessary to locate the data accurately. It has a very broad development prospect in the field of measurement, especially in underground detection. Under certain conditions, this technology can realize real-time image and sound transmission, and such high-precision data transmission is difficult to realize in the existing wireless technology. Therefore, in the practical application of this communication technology, it is necessary to install a microprocessor on the camera. After simply compressing the real-time image data to a certain extent, the data transmission rate can be reduced to tens of megabytes per second, so that the image data can be transmitted to the central control room several meters away by using UWB wireless communication technology.
Four. Concluding remarks
In the new era, through the analysis of the existing problems of Z igbee technology, it is further clarified that Z igbee technology and UWB technology are one of the hottest technologies in the wireless communication market at present, and they are an important part of wireless networks, laying a solid foundation for the optimization and improvement of wireless network management systems, and wireless technologies have broad application and development prospects. It is helpful to improve the competitiveness and efficiency of enterprises.
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