| 摘要 |
<p>A hub-free network system is provided in which control systems can operate normally for mutual communications, even though one of the plurality of control systems malfunctions. Each of the plurality of control systems has a network interface card, and each of the network interface cards has a plurality of communication ports. Each of the network interface cards, has a phase structure of ring topology by sequentially connecting a plurality of the communication ports. The plurality of the control systems perform the communications in the phase structure of ring topology, and perform the communications by changing the phase structure of ring topology to a phase structure of bus topology if an error occurs in the communications.</p> |
