The Research And Design On Wireless Expand Based On Industrial Control Network

With the constant expansion of industrial production, conventional wired industrial control system of communication method has not satisfied the request of the information transmission. Fieldbus is a digital network applied in process control field. At the beginning, Fieldbus network protocol has considered the requirement of the time in industrial. On one hand, Wireless LAN protocols can provide high rate of wireless communication. On the other hand, in some interference and unstable environment, its physical spread spectrum mechanism as well as the MAC layer of dynamic adjustment of transmission rate mechanism can also ensure the communication quality between equipments.This topic has used IEEE 802.11 x and CANBUS bus. In order to make cable sites and wireless site can be work in the same CANBUS,this thesis designed IEEE 802.11 b as CANBUS bus wireless expand.This paper firstly analysed IEEE 802.11 wireless LAN protocols and CANBUS fieldbus deeply. It verified the possibility using wireless LAN protocols for wireless expand to CANBUS. And then it provided general framework. Appropriate development board and operating system was selected to build hardware platform and software platform. Including appropriate embedded chip, CAN node chip, wireless card, etc. Linux operating system was installed in embedded development board. Wireless access points (AP) related functions was realized. Then, it realized the communications between cable stations and radio stations by programming. At last, the industrial control network wireless expansion was realized.Due to the real-time is one of the request inevitably on industrial control network, At the end of the paper it analyzed and studied the most commonly scheduling algorithm being used. This paper puts forward piecewise scheduling algorithm, and using MATLAB to simulation it.