Development Of Open-Type Motion Controller Based On PCI And USB Bus

The open-type numerical control system has become the development trend of NC technology nowadays, and the present NC systems are mainly based on PCs (personal computers) with various motion controllers. The application of motion controllers has extended out of the machine-processing field; more and more are applied in control of other industrial automation devices, such as robot control, electronic machinery, woodworking machinery, textile machinery, printing mechanism, and so on.The open-type motion controller has developed rapidly, which uses DSP and CPLD/FPGA as core processors and combines the information-handling capacity and the open-type characteristic of PC with the controller's motion path control ability, having many advantages such as strong information-handling capacity, good open-type characteristic, precise motion path, good versatility. From now on, the development of open-type motion controllers based on computer standard bus is still the market mainstream. The PCI bus solves the problem of low response velocity of ISA bus, and in recent years, equipments based on USB bus have also developed rapidly because of the merits of USB.Aiming at the shortcomings of domestic and foreign open-type motion controllers, for example, the overseas product price is high, the technical support is relatively weak, and the domestic product does not support USB bus, existing some technical flaws. this thesis develops multi-axis motion controllers based on PCI bus and USB bus respectively with TMS320LF2407 as their processors. PCI 9052 and ISP-1581 chips are adopted to construct the PC-DSP communication channel; CPLD component EMP7128 is used to achieve the functions of two groups of QEP signal processing and address decoding; at the same time, the auxiliary I/O card is also developed to connect the controller and external components after photo-electricity isolation and level transformation.