02-07-2013, 02:53 PM
Research on Application of ZigBee Technology in Flammable and Explosive Environment
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Abstract
Wireless Sensor Network based on ZigBee technology is a wireless network which is composed of many nodes of ZigBee RF chips, sensors and MCUs, especially suitable for application of the remote monitoring system in flammable and explosive environments. This paper presents the characteristics and advantages of ZigBee technology, also discusses the system for hardware and software design. This system effectively ful-fills the remote monitoring in flammable and explosive environments and posses high practical values.
Introduction
In the oil, chemicals and other inflammable and explo-sive production environment, it is essential to the pro-duction site, some information (such as pressure, tem-perature, gas concentration, etc.) for data collection and transmission network in order to achieve remote moni-toring and control. At present, widely used by cable way through all kinds of information sent to the monitoring center, however, most point of the scene to monitor geo-graphical dispersion, environment, complex terrain, which is encountered in many practical applications: 1) To set up a qualified cable transmission network, there is the complexity of the construction and implementation of the difficulty; 2) In order to achieve all-round production of effective environmental monitoring, dispersed layout must be many types, the large number of nodes to monitor the data acquisition, cable monitoring is often difficult to achieve; 3) The cable monitoring system has its own limitations, such as the laying of a high fixed cost of communication lines. In recent years, the emergence of ZigBee technology has provided some very good ideas to solve these problems mentioned above.
ZigBee Technology
ZigBee is a relatively recent emergence of wireless net-work communication technology, more than 100 well- known by the global coalition of hardware and software companies committed to the development of a short- range, low rate, low-power wireless network standards, the main development direction for the wireless sensor networks, home automation, remote control, industrial automation, agricultural automation, and medical care and other applications.
ZigBee Wireless Network Type
ZigBee network topology has three: star, cluster tree and mesh type as shown in Figure 2. Among them, the star- shaped network is a network-based control center, by a coordinator node and a number of terminal nodes, terminal nodes realized through co-ordination among the commu-nication; cluster tree network has increased the concept of routing, terminal node coordinator can not only access node can access any node has a routing function, it has routing node can not be direct communication between each other only through the co-ordination of the routing nodes between the completion of the communication; mesh network to provide a more flexible mechanism, through the self-organizing routing and wireless data communica-tions to provide multiple paths, when the optimal commu-nication path failure, a redundant mesh network in the other path to choose the most appropriate the path for data communication, therefore, effectively reduce the net-work structure of information transmission delay and improve the reliability of the network communications.
System Hardware Design
Explosive production environment is a remote moni-toring system by a number of ZigBee network node. Each node is basically the same hardware structure, but not the same network layer. ZigBee hardware in each node has two basic components: micro-controller and wireless receiver send some. Hardware-specific features into the single chip to achieve by the burning process to decide.
Node Design Coordinator
Network as the network coordinator of the center is re-sponsible for the establishment of a network, information reception, aggregation, processing and sending control instructions and implementation. Coordinator power to start the procedure after the initialization, by calling the function aplFormNetwork ()create a network, select a Coordinator PANID as a network logo, create a routing table, and then released to inform the other routers broadcast frame or a terminal node The addition of node equipment. Start by sending a GPRS module AT com-mand set serial communication rate, the establishment of data communication socket connections ready to begin to send and receive data and instructions to implement var-ious operations.
Conclusions
In this paper, the design of ZigBee technology produc-ion environment explosive remote monitoring system, the degree of coverage cluster tree network structure, node chip CC2430, has flexible, economic practicability, design easy. If the target needs to be identified in accor-dance with the actual sensor types and routers and the number of terminal nodes, the system can be applied to the production and living more occasions to address the practical application of the cost of wired network cabling is too high, not the arrival of the regional environment kinds of information to monitor the problem.