The Electronic Let-off And Take-up System Based On The Field-Bus Technology

The fieldbus is a digital, two-way transmission and multi-branched structure communication network which connects the intelligent field equipment and automatic system. Two-way, multiple joint and bus digital communication is its pivotal symbol. CAN belongs to the field bus category, it is a kind of serial communication local area network which effectively supports the distributivity real-time control system. Now it has become hotpot in industry control domain.A kind of electronic let-off and take-up system based on ARM is presented in this dissertation.The electronic let-off and take-up system is an important link of textile technology. Its control performance affects the loom's weaving quality directly.Based on analyzing the development of electronic let-off and take-up system at home and abroad as well as the principle and feature of the electronic let-off and take-up system, excellent control scheme of hardware(ARM controller) and software algorithm(fuzzy PID) of system is adopted.Fine performance and conforms to the domestic and foreign development tendency's electronic let-off and take-up system is designed.At the same time, the performance superior field bus-CAN is adopted, established the monitoring network, realizes the textile production automated management.There are two essential technology in this article: one is to keep consant of warp tension in loom control system, the other is the communication realization based on CAN.According to the system scheme and the hardware resources which are needed to reslize the function, a circuit board using ARM7 LPC2119 of PHILIPS and the negative feedback servo control system by tension loop are designed. And the tension sensor,AC srevo-motor and encoder are also selected by the require and actual situation.The monitoring network of loom is established by the CAN-bus, it can monitor the functional state of loom in real-time, as well as delivering the correlation parameters to the personal computer.The whole control system is simple and convenient, it has better reliability andreal-time property. In the meantime, exploiting the let-off and take-up system which has independence intellectual property rights could help to enhance the quality and technical merit of our country, and play a positive role in loom industry.