Siemens Aktiengesellschaft

Guenter Steindl

Chongning Na

Dragan Obradovic

Joachim Feld

Philipp Wolfrum

Ruxandra Scheiterer

A device and method for time synchronization in a communication network, wherein a virtual clock is produced by a controller in each network node based on the PROFINET-Standard and/or the Precision Transparent Clock Protocol. In contrast to known methods for estimating the time, the time of the virtual clock does not undergo sudden changes. The virtual clock includes a controlled, continuous path. As a result, the virtual clock is particularly suitable for time-critical applications. Here, the estimation of the time of a reference clock is improved by 18-35%. Accordingly, a markedly greater number of network nodes may be synchronized with a predetermined level of accuracy for the time synchronization.

Device and method for time synchronization in a communication network

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.

Operating method for an automation unit

A communication method for use with a decentralized bus system B, to which a plurality of communication participants are connected, including a first master Mwhich is assigned to a first master system MSand a second master Mand a slave Swhich are assigned to a second master system MSthat 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 Mover the bus B. The message M is detected, and at least some header data are evaluated in the second master system MSincluding 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.

Method and system for active publishing using a slave assigned to a master system to detect, evaluate and make the message available to an application associated with the slave

A communication process and system for communicating between communication participants (S , S , S , S ) 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.

Communication process and system with service access points and groups of references where participant addresses are used to access a particular reference

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Poppenricht, Germany

Guenter Steindl