Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network monitoring
Reexamination Certificate
2005-10-04
2005-10-04
Lin, Wen-Tai (Department: 2154)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network monitoring
C700S009000
Reexamination Certificate
active
06952727
ABSTRACT:
A method for adapting a computer-to-computer communication protocol, and especially TCP/IP, or any protocol implemented in a general purpose off-the-shelf network like Ethernet, for use in providing communication needed in an industrial control system, and especially an industrial control system using a programmable logic controller (PLC), where there is frequent communication between the PLC and control or monitoring elements, the method aimed at allowing the PLC to perform scanning of its ladder logic at a rate adequate for effective industrial control. The method includes making permanent-type TCP connections between the PLC and a control element or a monitoring element, use of a protocol for communication with a control or monitoring element in which both a read register and a write register instruction is included in a single communication transaction, such as a MODBUS command, and tuning communication between the PLC and a control element or a monitoring element.
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“Open Modbus/TCP Specification,” A. Swales, Schneider Electric, pp. 1-26, Mar. 29, 1999.
Lindner David T.
Swales Andrew G.
Lin Kenny
Lin Wen-Tai
Schneider Automation Inc.
Ware Fressola Van Der Sluys & Adolphson LLP
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