摘要:
The invention refers to a method for monitoring a communication media access schedule of a communication controller (5) of a communication system (1) by means of a bus guardian (6). The communication system (1) comprises a communication media (2) and nodes (3) connected to the communication media (2). Each node (3) comprises a communication controller (5) and a bus guardian (6) assigned to the communication controller (5). Messages are transmitted among the nodes (3) across the communication media (2) based on a cyclic time triggered communication media access scheme. In order to provide a mechanism which allows the bus guardian (6) to monitor the communication media access scheme of the communication controller (5) even during startup of the communication it is suggested, that the bus guardian (6) has a priori knowledge about possible deviations from the communication media access schedule during startup of the communication and that the bus guardian (6) during startup makes use of the a priori knowledge to distinguish between an allowed deviation and a forbidden deviation caused by a failure of the communication controller (5).
摘要:
The invention refers to a method for synchronizing clocks in a distributed communication system comprising at least one communication media and a number of nodes connected to the communication media. The nodes comprise the clocks. In order to provide a possibility of synchronizing the clocks of the nodes with a high precision and at the same time tolerating high deviations in clock rate, it is suggested that for synchronizing the clocks differences in offset of the clocks as well as differences in rate of the clocks are corrected.
摘要:
A Network-system with at least one node, whereby the at least one node is coupled to a communication line and with means for communication which are able to create a communication cycle on said communication line whereby said communication cycle consists at least of a static segment and/or a dynamic segment and respective device, especially node, and respective method and respective computer program and respective computer program product.