Breakdown and decoupling tolerant communications network, a data path switching device and a corresponding method

A method for controlling the movement of a plurality of machine parts using a communication network tolerating a breakdown or decoupling of at least one network node (2), wherein the network is operated according to a closed multiple ring structure, in which each node (2) communicates with a transmitter (TX) or the port (12) of a first adjacent node (2) by means of a receiver (RX) or a first port (11) and with the receiver (RX) or the port (11) of a second adjacent network node (2) by means of a transmitter (TX) or a second port (12), and the closed ring structure is preserved in the case of a breakdown or decoupling of at least one of the nodes (2), at least one of the nodes (2) is coupled to the network via a data path switching device (1) which is actuated in the case of a breakdown or decoupling of said node (2) in such a way that the communicating nodes (2) which exist in the network and are arranged next to each other in the ring structure interact in communication by means of a relevant port (11, 12) or transmitter (TX) and receiver (RX) thereof after the breakdown or decoupling, the method comprising:

• (a) operating the network on the basis of a double ring structure;
• (b) communicating to and from each node (2) with each node's two nearest adjacent nodes (2) by means of two bi-directional communication ports (11, 12), each bi-directional port comprising a transmitter (TX) and a receiver (RX);
• (c) using at least one switching device (1) with four bi-directional communication ports (11, 12, 21, 22) and allocating two (11, 12) of the four bi-directional communication ports to adjacent nodes (2) and allocating the other two (21, 22) of the four bi-directional communication ports to the node (2) to be coupled and used for generating communication flags (link) to indicate whether the node (2) to be coupled is capable of communication or not;
• and
• (d) controlling the switching device (1), when not capable of communication, by the communication flags (link) in such a way that the ports (21, 22) of the switching device (1) associated with the coupled node (2) or the coupled node (2) are bridged, and therefore the coupled node (2) is separated from the ring structure.