Design of control system of flat knitting machine based on hierarchical structure

PAN Yunlei, SHI Weimin, PENG Laihu
(College of Machinery and Automation, Zhejiang SciTech University, Hangzhou 310018, China)

Abstract: In order to solve the problems of data transmission among user interface layer, main control layer and bottom control layer, the CAN bus communication technology and field programmable gate array(FPGA) dualport RAM communication technology applied to the knitting machine control system was investigated. After the analysis of hierarchical structure of knitting machine control system, the relationship among user interface layer, main control layer and the bottom control layer was established. A method was presented to transmit data, FPGA dualport RAM is used between human interface layer and main control layer, CAN bus was used between main control layer and bottom control layer. The speed and accuracy of CAN bus communication and FPGA dualport RAM communication were evaluated on the actual test, the speed and accuracy of CAN bus communication and FPGA dualport RAM communication were tested. The experimental results show that the design method is reasonable and feasible.
Key words: control system of knitting machine; dualport RAM; controll area network(CAN) bus; field programmable gate array(FPGA)