Yokogawa YVP20S - Manual (Page 30)

5-1
IM 21B04C50-01E
<Toc> <Ind> <5. FOUNDATION FIELDBUS OVERVIEW>
5. FOUNDATION FIELDBUS OVERVIEW
This chapter will introduce concepts that are used in most parts of the manual. It will
briefly introduce Foundation Fieldbus blocks, and some of the essential block
concepts. Throughout the manual we will reference a simple process example. The
example is a simple heat exchanger with two control valves, and three measurement
devices. The controls are configured in a cascade arrangement to illustrate
concepts of transfer between modes and states of the various levels of control.
5.1 Reference Model Process Used in This User’s
Manual
The heat exchanger model is shown in Figure 5.1. It is not a practical process, but
incorporates elements that illustrate important features of ValveNavi. Note that each of the
devices has a device tag that will be used to identify devices in ValveNavi. The process
consists of a vessel with a product vapor inflow, which is condensed, and flows out as a
liquid outflow. The tank level is controlled by an outflow control valve, LV 201. The tank
contents are chilled by coolant water. The temperature is controlled by a temperature
controller cascaded to a flow controller. The coolant flow is controlled by control valve FV
101.
Figure 5.1 Heat exchanger