Patent ID: 7302485
Filing Date: 2007-11-27
Classification: G05B,H04L

Abstract:
1. A method for transmitting OPC (OLE for process control) data via a data network, comprising: sending a first connection request for establishing at least one first transmission channel, the first connection request being sent from an OPC client via a data connection to an OPC server; maintaining a data transmission channel permanently open between the OPC server and the OPC client, the data transmission channel being maintained permanently open by transmitting dummy data when there is no useful OPC data present; and sending, at any desired time and independently of the actions of the OPC client, OPC data from the OPC server to the OPC client, wherein in order to maintain the data transmission channel permanently open to permanently allow quantities of data up to a defined size to be transmitted from the OPC server to the OPC client, the OPC server sends a new connection request to the OPC client before the quantity of data reaches the defined size, and then the OPC client sends a new connection request to the OPC server for establishing at least one new transmission channel.