Abstract: The invention relates to a method and a system for communication in a data network (101), in particular switched Ethernet, and a user (102) in such a data network (101). To reduce the communication resources required for the transmission of telegrams (119-135) in the data network (101), it is proposed that time segments are defined, which are repeated cyclically at a basic clock rate, that telegrams (119-135) are each assigned a first identifier U, which allocates to the respective telegram (119-135) a group of n successive time segments for transmission of the respective telegram (119-135), whereby the group is repeated cyclically, that the telegrams (119-135) are each assigned a second identifier Z, which allocates to the respective telegram (119-135) an mth time segment in the sequence of n time segments of a group for transmission of the respective telegram (119-135), whereby 1?m?n and that the telegrams (119-135) are transmitted in the respectively assigned time segment.

Abstract: A method for cyclical communication between communications stations controls or surveys a technical process, through a bus. Communications relations, which are provided for the communication stations are executed during each bus cycle of predetermined duration and if a communications relation is disturbed, its repetition is scheduled for a succeeding bus cycle and the disturbed communications relation is acknowledged with a special acknowledgement code.

Abstract: A communication method for use with a decentralized bus system B, to which a plurality of communication participants are connected, including a first master M1, which is assigned to a first master system MS1, and a second master M2 and a slave S3, which are assigned to a second master system MS2 that is associated with at least one application and provided with a filter table FT containing data entries. A message M having a header (provided with data entries corresponding to the filter table data entries) and message data is formed and transmitted from the first master M1 over the bus B. The message M is detected, and at least some header data are evaluated in the second master system MS2, including being compared to the filter table data entries. The message data D are made available to the application when the header and filter table data entries coincide.

Abstract: A communication process and system for communicating between communication participants (S1, S2, S3, S4) that are provided for control and/or monitoring of a technological process, the communication participants connected in communication with each other by way of a bus system (B) and can be identified using their addresses. Each communication participant manages a first group of references as so-called service access points (SAPs), and for at least one of the service access points, a second group of references is managed. Access to an individual reference from this second group of references is carried out using the address of the accessing communication participant. A source address lookup table may be provided to convert participant addresses into a unique natural number corresponding to a particular reference.

Abstract: A communication subscriber which, as a passive subscriber of a communication system, does not have its own transmission authorization but listens to all the communication processes and can receive only those data items which are also intended for it, which can be identified without doubt from destination identifier allocated to the data items, is given the capability, according to the invention, also to receive in addition those data items whose destination identifier and source identifier match an entry in a filter table provided in the communication subscriber which has been given the capability according to the invention.

Abstract: A communication method for use with a decentralized bus system B, to which a plurality of communication participants are connected, including a first master M1, which is assigned to a first master system MS1, and a second master M2 and a slave S3, which are assigned to a second master system MS2 that is associated with at least one application and provided with a filter table FT containing data entries. A message M having a header (provided with data entries corresponding to the filter table data entries) and message data is formed and transmitted from the first master M1 over the bus B. The message M is detected, and at least some header data are evaluated in the second master system MS2, including being compared to the filter table data entries. The message data D are made available to the application when the header and filter table data entries coincide.

Abstract: A potential communication partner receives an inquiry which prompts it to notify the inquiring party of its interface in machine-readable form. When the interface data for the potential communication partner are available, the interface data can be transferred to a program, and communication with the remote partner can be started, the communication including a request for a functionality which is provided by the remote partner.

Abstract: Communication process for communication between communication participants (S1, S2, S3, S4) provided for control and/or monitoring of a technological process, which are connected in communication with each other by way of a bus system (B) and can be identified using their addresses, whereby each communication participant manages a first group of references as so-called service access points, wherein for at least one of the service access points a second group of references is managed, whereby the access to an individual reference from this second group of references is carried out using the address of the accessing communication participant.