| 摘要 |
<p>The present invention is concerned with the identification of an improper cabling of control system devices connected to redundant communication networks of a distributed control system, in particular a substation automation system. As proposed in the standard IEC 62439 (Parallel Redundancy Protocol PRP), messages including a sender identification or source address as well as network or associated device port identification are transmitted from a sending device to a receiving device over the redundant networks. The receiving or destination device determines a connect status indicating whether or not a message has been received on a particular device port, as well as an error event indicating whether or not said device port is associated to the network identified in the received message. By doing so for at least two distinct sending devices, the invention produces, in addition to diagnosing an improper communication path between two devices, an indication as to the location and/or type of wrong cabling. Single error events are preferably supplanted by error rates calculated as a probability of receiving messages on a device port not associated to the network identified in the received message and compared to error thresholds for the purpose of identifying improper cabling.</p> |
