双环光纤CAN总线的自动保护倒换

The Automation Protection Switching of Dual Loop Fiber-CAN Bus

CAN总线由于其显著的特点被广泛地应用于工业现场。光纤由于其优良的抗EMI特性而日益受到人们的瞩目。在光纤环形CAN网络中,单环fiber-CAN总线的安全性较差,为提高光纤CAN网络的可靠性,设计了高可靠性带有保护环的光纤双环CAN网络,以及相应的fiber-CAN总线接口电路,着重设计了基于看门狗的光纤双环自动保护倒换电路。通过五个节点的fiber-CAN总线组网,验证了光纤双环CAN总线网络的可行性和自动保护倒换电路的正确性。

The Controller Area Network(CAN) bus is implemented for a wide range application in industrial field, because it has advanced fea- tures. Optical-fibre is focused the attention of people's in many fields, because of excellent feature in anti-interference of electro mag- netic. In the fiber CAN bus network which has loop topological construction, the single loop fiber-CAN has poor security. In order to improve the reliability Of fiber-CAN, a double loop fiber-CAN and its interface circuit are put forward. Because there is accessory pro- tecting loop, the double loop fiber-CAN has higher reliability. The APS(automation protection switching) circuit of dual fiber loop is designed with DS1232 watchdog chip. After construction the fiber-CAN network with five nodes, it is showed that the dual loop fiber-CAN is feasible and the APS circuit is satisfactory.