METHODS AND APPARATUS FOR CONTROL USING CONTROL DEVICES THAT COMMUNICATE VIA AN IP NETWORK
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United States of America Patent
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Issued Date -
Jun 25, 2009
app pub date -
Dec 12, 2008
filing date -
Jun 11, 1999
priority date (Note) -
Abandoned
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Abstract
The invention provides improved methods and apparatus for control using field and control devices that provide a virtual machine environment and that communicate via an IP network. By way of non-limiting example, such field device can be an “intelligent” transmitter or actuator that includes a low power processor, along with a random access memory, a read-only memory, FlashRAM, and a sensor interface. The processor can execute a real-time operating system, as well as a Java virtual machine (JVM). Java byte code executes in the JVM to configure the field device to perform typical process control functions, e.g., for proportional integral derivative (PID) control and signal conditioning. Control networks can include a plurality of such field and control devices interconnected by an IP network, such as an Ethernet.
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