Terry Blevins of Emerson Talks About Optimizing Gain Through FOUNDATION Fieldbus Characterizer Blocks

Terry Blevins of Emerson Process Management has an excellent blog on modeling and process control.  Hist post of August 8th has some interesting things to say about process gain and how it can be optimized with FOUNDATION fieldbus.  Process gain is often called the “sensitivity of the process”, and shows how the PV reacts in responses to changes in controller output (CO).  Blevins asserts that, from a process control perspective, process gain should be constant. 

Blevins states that it is not always possible to change valve characteristics to compensate for changes in process gain during commissioning because of the time and expense involved.  If you have a FOUNDATION fieldbus installation, however, the block structure of FOUNDATION technology allows you to use a characterizer block between the PID and analog output blocks.  You can achieve a consistent response to load disturbances and setpoint changes even if the final control element has non linear installed characteristics.  Read the rest of the post to get the whole story:

Terry Blevins Modeling and Control Blog: Commissioning Control Systems — Installed Characteristics

About FieldComm Group

The FieldComm Group is a global standards-based organization consisting of leading process end users, manufacturers, universities and research organizations that work together to direct the development, incorporation and implementation of new and overlapping technologies and serves as the source for FDI technology. The FieldComm Group’s mission is to develop, manage and promote global standards for integrating digital devices into automation system architectures while protecting process-automation investments in HART and FOUNDATION Fieldbus communication technologies. Membership is open to anyone interested in the use of the technologies. For more information, visit their web site at www.fieldcommgroup.org.

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