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Communication Technologies for Throttling Valve Control

By Terry Blevins and Kurtis Jensen, Emerson |

Closed-loop control performance depends on the dynamic response of the controller, valve, measurement and process. Can wireless compete with conventional networks? When using throttling valves in closed-loop process control, a variety of factors impact the selection of the most appropriate communications network. Chief among them are performance and installation cost. Within the chemical process industries (CPI), three networking technologies are commonly used to interface throttling valves with the automation system: 4–20 mA with HART, fieldbus and wireless. This article examines these three options, and also provides information on emerging technologies to improve control performance.   Factors affecting control performance Performance in a closed-loop control application depends on the dynamic response of the controller, valve, measurement and process (Figure 1). To achieve a target control objective, it is necessary to consider all of these components (see sidebar section “Valve and Positioner Technology”). Figure 1. Several factors can affect the performance of the control loop for a throttling valve[/caption] Performance and cost discussions should always start with the process, but care should be taken…
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