Hardware and software design of control system in high speed flat knitter based on ARM9 and double CPLD

For the knitting machine requirements on high real-time performance,stability,reliability,function expansion and interference resistance,a hardware and software design of a control system based on the ARM9 and double CPLD is presented.The hardware design comprises an ARM9 control module,a double CPLD circuit,and a CPLD internal control circuit.The design of the control interface circuit is performed using the bus simulation method;and the double CPLD development board circuit is designed with two CPLD circuits,a multi-power supply circuit,a crystal oscillator circuit,a JTAG circuit,and an I /O isolation circuit,and a top principle diagram of the double CPLD internal memory control circuit is presented.A software structure design of the control system structure and the design of the flat knitter knitting process adopting the ARM9 and double CPLD are presented.The soft testing shows that the hardware design is in normal operation.