Based On ARM Technology Development Of CAN-PROFINET Protocol Conversion Gateway

With the development of smart grid, PROFINET is well adopted in low voltage power distribution system as an efficient communication technology. Intelligent circuit breakers can connect with other devices, such as human machine interface (HMI) and programmable logic controller (PLC) by PROFINET Industrial Ethernet interface, and consist a large-scale, high real-time intelligent low voltage switch-gear device monitoring system. However, general intelligent circuit breakers are CAN supported instead of PROFINET supported. Furthermore, the key technology of CAN-PROFINET protocol conversion is monopolized by a few manufacturers. To realize intelligent circuit breaker high performance communication in industrial Ethemet, it is necessary to research and develop a CAN-PROFINET protocol conversion gateway, which has proprietary intellectual property rights. An ARM core based CAN-PROFINET protocol conversion gateway is proposed in this study. The main work of the paper include:(1) Hardware and software design of CAN-PROFINET protocol conversion gateway. The structure and functions of gateway are defined. And the hardware is produced according to the designed circuit scheme. To guarantee the gateway can take 8 slave ETU nodes, the software and device description file (GSDML file) of the gateway are also finished based on the protocols of CANOpen and PROFINET. The gateway prototype realize the protocol mapping between CANOpen and PROFINET, and high performance data transmission between CAN bus and PROFINET Industrial Ethernet. (2)A control algorithm for stable bus utilization with parameter optimization is proposed. The study analyses the parameters and their performance factors of CAN bus, and proposed the corresponded control algorithm which can well adopt the time variant character of CAN bus PDO number. The algorithm is tested in the practical protocol conversion gateway. (3) A serious experiments were proposed to verify performance of the gateway. The experiments include function tests, performance tests and reliability test. Particularly, all reliability related signals are evaluated. To test deep of protocol messages, a test bed with CAN bus and PROFINET network is set up. Then experiments are done follow by the rules of practical application scenarios. Experimental results show that the designed CAN-PROFINET protocol conversion gateway reach the design requirement. The advantages of the gateway include high efficiently and reliability, it has significant potential for low voltage power distribution system.The progress of this study include:(1) Reliable gateway hardware design with consideration of constraint conditions, such as anti-interference, noise isolation, filtering, one-spot and multi-spots grounding. (2) For constant CAN bus PDO number, the control algorithm for stable bus utilization with parameter optimization is proposed. The experimental results indicate that the bus utilization can quickly track set value by using the proposed algorithm with small perturbation. Hence, it is can conclude that proposed method has a good dynamic performance. (3) Since the gateway prototype has passed the immunity test (IEC61000-6-2), emission test (IEC61000-6-4) and tests of PI PROFINET B class product certification, it can be conclude that the prototype comply with the standards for industrial low voltage switchgear device. The product can be directly put on the market. The works of present study has broken through the existing technical barriers, the designed CAN-PROFINET protocol conversion gateway has significant potential for the next generation of intelligent low voltage switchgear device monitoring system.