A method to perform a cycle synchronization between interconnected sub-networks, in which a reference node connected to one of the sub-networks transmits a respective cycle time information to cycle masters of all other sub-networks at recurring time instants, and the cycle masters of all other sub-networks...http://www.google.com.tw/patents/US7720110?utm_source=gb-gplus-share專利 US7720110 - Cycle synchronization between interconnected sub-networks
