| 摘要 |
A method for remotely controlling installations such as process plants, power plants, electrical installations, etc. through a data processing network, in particular, through a data processing network (1) with TCP/IP protocol, said installations comprising appliances such as process variables measuring instruments (6b) and actuating devices of valves, motors, pumps or the like. The method provides prearranging a server (2) wherein a gateway is resident, the gateway being connected to a first port that has a public static IP address and that can be seen within network (1), associating peripheral devices (4) to respective appliances (6b) and supervision units (3) to each user of the control. Each terminals, i.e. a peripheral device (4) and/or a supervision unit (3), requires and obtains a dynamic IP address (40) and is granted to access network (1) by a IAP. Then, a request of a connection to the gateway of server (2) is carried out by the terminal through the first port. The connection is accepted by the gateway of server (2), which stores terminal IP address (40) of the terminal. Afterwards, the gateway asks and obtains from the terminal a proper identification code (44), and stores terminal IP address (40) and identification code (44) in a record of a table of correspondence (15). Whenever a query (41) or a command is submitted by a supervision unit (3) towards a peripheral device (4), or data are sent by a peripheral device (4) to a supervision unit (3), the gateway uses addressee (4) identification code (44) and table of correspondence (15) to retrieve IP address (40) to which query (41) /the data must be redirected to reach desired peripheral device (4) / supervision unit. |
