Abstract: A computer-implemented method for determining the topology of a serial asynchronous data bus, to which at least a first bus subscriber and a second bus subscriber are connected, which subscribers communicate via a prescribed bus access protocol.

Abstract: Bus subscriber device for connection to a line-redundant, serial data bus, over which data are exchanged according to a predefined protocol, having the following features: a data transmission unit, at least two data receiving units that are connected in parallel, a line selection logic and at least two bus communication interfaces for connecting to a corresponding number of lines of the data bus, wherein each of the data receiving units is connectable via an associated bus communication interface to an assigned line of the data bus and has means for receiving a data block from the associated line of the data bus and means for forwarding the received data block to the line selection logic, and wherein the line selection logic has means for selecting a line of the data bus as a receiving line and forwarding the data block received over the selected receiving line.

Abstract: A computer-implemented method for determining the topology of a serial asynchronous data bus, to which at least a first bus subscriber and a second bus subscriber are connected, which subscribers communicate via a prescribed bus access protocol.

Abstract: The invention relates to a computer-implemented diagnostic procedure for a field bus system in which bus users exchange data via a field bus in accordance with a predetermined communication protocol, the data being exchanged in the form of data packets, comprising the following procedural steps: (a) recording states of the bus users; (b) detecting a data packet which is transmitted via the field bus between the bus users; (c) analyzing the data packet and deriving an updated state of the bus users in dependence on the preceding state of the bus users and the content of the data packet; (d) recording the updated states of the bus users; (e) repeating steps (b) to (d) in order to detect the current states of the bus users in an in-line manner.

Abstract: The invention relates to a computer-implemented diagnostic procedure for a field bus system in which bus users exchange data via a field bus in accordance with a predetermined communication protocol, the data being exchanged in the form of data packets, comprising the following procedural steps: (a) recording states of the bus users; (b) detecting a data packet which is transmitted via the field bus between the bus users; (c) analyzing the data packet and deriving an updated state of the bus users in dependence on the preceding state of the bus users and the content of the data packet; (d) recording the updated states of the bus users; (e) repeating steps (b) to (d) in order to detect the current states of the bus users in an in-line manner.