System for remotely accessing an industrial control system over a commercial communications network
October 16, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesModular digital telephone system with fully distributed local switching and control Network interface board having memory mapped mailbox registers including alarm registers for storing prioritized alarm messages from programmable logic controllers Reconfiguration of protocol stacks and/or frame type assignments in a network interface device System for configuring and remotely administering a unix computer over a network Distributed interface architecture for programmable industrial control systems Patent #: 5805442 InventorsAssigneeApplicationNo. 174565 filed on 10/16/1998US Classes:700/83, Having operator control interface (e.g., control/display console)700/9, Supervisory control700/67Plural variablesExaminersPrimary: Gordon, Paul P.Assistant: Robinson, Victoria Attorney, Agent or FirmInternational ClassG05B 009/02AbstractA control system allows a user to access a programmable logic controller (PLC). system over a communication network such as an Internet network using a web browser. The system includes an Internet web interface between the network and the programmable logic controller. The Web interface serves Web pages from an Ethernet interface on a PLC and includes an HTTP protocol interpreter and a TCP/IP stack. The Web interface provides access to the PLC by a user at a remote location through the Internet. The interface translates the industry standard Ethernet, TCP/IP and HTTP protocols used on the Internet into data recognizable to the PLC. Using this interface, the user can retrieve all pertinent data regarding the operation of the programmable logic controller system. | |
