Development of DeviceNet fieldbus intelligent node

The DeviceNet is a low-cost and high-performance fieldbus. It has been widely applied in the industrial automatic fields in recently years, so the demands of DeviceNet product are increased gradually. To satisfy market needs, the hardware and software designs have been proposed for developing intelligent node of DeviceNet in this paper. The hardware design is mainly composed of controller (SJAl000), microprocessor (80CS1), bus transceiver (82C251), photoelectrical isolation (6N137), switches and display portion, etc. The software design is mainly composed of controller initialization, data receiving, data transmitting, etc. Hardware circuit and software flow charts have been given and some problems that should be paid attention to in realizing are indicated at the same time.