| 摘要 |
The invention relates to a system and method for transmitting data over the internet, especially data for the operator control and for the monitoring of an automation system (5). The invention provides a method or a system for a bi-directional useful data connection, also behind firewalls, over the internet in both directions and also from a client which can not be regarded as a server in the internet. According to the invention, a first connection request for establishing a first transmission channel (6a, 7a, 8a) is transmitted out via an internet connection (6, 7, 8) to an internet server (4) of an automation system (5) from a first data processing device (1) of a client, especially from an operator control and monitoring system (1). In addition, a second connection request for establishing a second transmission channel (6b, 7b, 8b) is transmitted to the internet server (4) from the client (1), whereby the first and the second transmission channels are provided over the internet for the transmission and reception of data, said transmission and reception being time-independent of one another and bi-directional, between the client (1) and the internet server (4). A time-unlimited utilization period of the transmission channels is ensured by transmitting dummy data in order to maintain the transmission channels even when useful data is not available.
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