Safety communication method, communication apparatus, safety communication system and control system
AssigneeSiemens Aktiengesellschaft
InventorsMarkus Walter, Sebastian Schötz, Ronny Hog
Life of this patent
Estimating the term…
Abstract
Apparatus and method for monitoring a communication connection, wherein in the event of a periodic transmission of a request, the request is supplemented by a specific identifier and an error is detected if a response with this identifier is not received within a predetermined period of time, where the specific identifier for a plurality of requests sent in succession is already modified before a response with a previously transmitted identifier has been received.
Claims14
A safety communication method of an industrial automation system, the method comprising:
- sending, by a primary instance within the industrial automation system, a request data telegram with a pre-modified monitoring identifier to a secondary instance within the industrial automation system;
- returning, by the secondary instance within the industrial automation system, a response data telegram with a monitoring identifier which is identical to the pre-modified monitoring identifier sent with the request data telegram;
- and
- detecting, by the primary instance within the industrial automation system, an error in communication if the primary instance within the industrial automation system has not received the response data telegram with the monitoring identifier which is identical to the pre-modified monitoring identifier sent with the request data telegram within a predetermined timeout period after sending the request data telegram, the predetermined timeout period being simultaneously monitored for a plurality of different monitoring identifiers;
- wherein the pre-modified monitoring identifier sent with the request data telegram is further modified after sending a predetermined number of request data telegrams.
A communication apparatus for a safety communication system of an industrial automation system, the communication apparatus comprising:
- a processing facility including memory;
- wherein the processing facility is configured to:
- send a request data telegram with a pre-modified monitoring identifier to a further communication apparatus of the industrial automation system;
- receive a response data telegram from the further communication apparatus of the industrial automation system, the response data telegram comprising a monitoring identifier corresponding to the pre-modified monitoring identifier sent with the request data telegram and which is identical to the pre-modified monitoring identifier sent with the request data telegram;
- and
- detect an error in communication between the communication apparatus and the further communication apparatus of the industrial automation system if the response data telegram with the monitoring identifier which is identical to the pre-modified monitoring identifier sent with the request data telegram has been received within a predetermined timeout period after sending the request data telegram, the predetermined timeout period being simultaneously monitored for a plurality of different monitoring identifiers;
- and
- wherein the processing facility of the communication apparatus is further configured to further modify each pre-modified monitoring identifier sent with the request data telegram after sending a predetermined number of request data telegrams.
Dependencies are inferred from the claim text.