System and method for transmitting OPC data via data networks, in particular the internet, using an asynchronous data connection

US7302485B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Michael Bauer · Madison, US
• Roland Heymann · Erlangen, DE
• Heinz-Christoph Schmolka · Graben-Neudorf, DE
• Marcus Sebald · Erlangen, DE
• Thomas Talanis · Heroldsbach, DE
• Frank Volkmann · Amberg, DE

Key dates

• Filing date: Jul 27, 2001
• Grant date: Nov 27, 2007
• Expiry date: Mar 7, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L69/329
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

OPC data is transmitted via data networks, in particular the Internet. A bi-directional data connection via the Internet in both directions is enabled even across firewalls and starting from an OPC client, which is not visible as a server on the Internet. To achieve this, a first connection request for establishing a first transmission channel is sent from a first data processing device of an OPC client, via a data connection, to an OPC server of an automation system. The OPC server responds to the request using a second transmission channel. The data connection is thus kept open permanently, allowing data to be sent and received bi-permanently, allowing data to be sent and received bi-directionally, the operations being temporally independent of each other, between the OPC client and the OPC server by at least one data network, in particular, the Internet.