Abstract: A communication system comprises a first and a second master unit and at least one slave unit, wherein the second master unit is switched into a data transmission chain reaching from the first master unit to the slave unit in order to continue data transmission if a link fault occurs.

Abstract: In order to operate a safety control in an automation network having a master subscriber which implements the safety control, the safety control is assigned an identifier. When loading the safety control, the master subscriber checks whether the stored identifier in the safety master subscriber matches the identifier calculated form the safety control, and the automation network changes to a safe state if it is determined that the identifier differs.

Abstract: A method retrieves subscriber identifications in a communication network having multiple subscribers which are connected to a ring-shaped transmission path. A first telegram is outputted onto the ring-shaped transmission path which comprises a sequence of telegram fields, wherein each subscriber is allocated a telegram field for entering its subscriber identification and each subscriber checks during the passing-through of the first telegram if the subscriber identification field allocated to the subscriber is vacant, and upon detecting a vacant subscriber identification field enters its subscriber identification.

Abstract: A communication system comprising a master unit and a plurality of slave units. In error mode, e.g. when a path error or a complete failure of a subscriber occurs, data transmission is carried out in a loop, starting from the master unit, via a first communication path and a second communication path.

Abstract: In a serial bus system data in the form of telegrams, representing process images of control tasks of the active station, are transmitted to the connected passive stations, and the process data are allocated to the process images in the passive station.

Abstract: In order to operate a safety control in an automation network having a master subscriber which implements the safety control, the safety control is assigned an identifier. When loading the safety control, the master subscriber checks whether the stored identifier in the safety master subscriber matches the identifier calculated form the safety control, and the automation network changes to a safe state if it is determined that the identifier differs.

Abstract: A network coupler is provided between a network, on which Ethernet messages can be transmitted, and a plurality of subscribers, the network being linked to an external interface of the network coupler and the plurality of subscribers being linked in series to a ring-type transmission path via an internal interface of the network coupler. For interchanging data, an Ethernet message received via the external interface of the network coupler is forwarded to the internal Ethernet interface of the network coupler and is output onto the ring-type transmission path, each subscriber connected to the internal interface interchanging the useful data intended for the respective subscriber with the Ethernet message circulating on the ring-type transmission path.

Abstract: In a serial bus system data in the form of telegrams, representing process images of control tasks of the active station, are transmitted to the connected passive stations, and the process data are allocated to the process images in the passive station.

Abstract: In a serial bus system data in the form of telegrams, representing process images of control tasks of the active station, are transmitted to the connected passive stations, and the process data are allocated to the process images in the passive station.

Abstract: A communication system comprising a master unit and a plurality of slave units. In error mode, e.g. when a path error or a complete failure of a subscriber occurs, data transmission is carried out in a loop, starting from the master unit, via a first communication path and a second communication path.

Abstract: A communication system comprises a first and a second master unit and at least one slave unit, wherein the second master unit is switched into a data transmission chain reaching from the first master unit to the slave unit in order to continue data transmission if a link fault occurs.

Abstract: For the purpose of controlling safety functions as part of a system controller which is not oriented to safety functions in an automation system, the invention provides safety modules having a sound functionality and provides a safety protocol which transmits data in the form of safety messages, wherein input and output parameters from each safety module are encapsulated by the safety protocol, and the individual safety modules are logically combined with one another in terms of data and flow by means of a data transmission link in line with the system's safety functions which are to be controlled, the data interchange taking place between the safety modules on the basis of the safety protocol.

Abstract: A network coupler is provided between a network, on which Ethernet messages can be transmitted, and a plurality of subscribers, the network being linked to an external interface of the network coupler and the plurality of subscribers being linked in series to a ring-type transmission path via an internal interface of the network coupler. For interchanging data, an Ethernet message received via the external interface of the network coupler is forwarded to the internal Ethernet interface of the network coupler and is output onto the ring-type transmission path, each subscriber connected to the internal interface interchanging the useful data intended for the respective subscriber with the Ethernet message circulating on the ring-type transmission path.

Abstract: In a serial bus system data in the form of telegrams, representing process images of control tasks of the active station, arm transmitted to the connected passive stations, and the process data are allocated to the process images in the passive station.