Internet web interface including programmable logic controller for controlling output devices based on status of input devices
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United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Apr 30, 1999
filing date -
Sep 10, 1997
priority date (Note) -
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Abstract
A control system includes an Internet web interface to a network of at least one programmable logic control system running an application program for controlling output devices in response to status of input devices. The Web interface runs Web pages from an Ethernet board coupled directly to the PLC back plane and includes an HTTP protocol interpreter, a PLC back plane driver, a TCP/IP stack, and an Ethernet board kernel. The Web interface provides access to the PLC back plane 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.
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