Response Electronics CL6011B Especificaciones descargar pdf (Pagina 93)

4Ć11DCP Configuration

Original Ć June 1990 CE4.2:CL6211

4.3 Direct Control Point Configuration

The Interactive and Computing Controllers provide control of continuous

processes through the use of Direct Control Points. The major

components of each Direct Control Point are:

H Primary Control Algorithm (PCA)

H Station Type

H FST (a series of auxiliary loop functions)

The PCA contains all of the intelligence necessary to transform the loop's

inputs into outputs. The station type is used to define the modes of

operation that are valid for the point. The FST functions define the

control sequence and are used to connect the various input and output

channels to the specific control functions that the user has selected.

A total of six forms are used in defining Direct Control Points. The

configuration items for these forms are described in the following

sections.

4.3.1 Direct Control Point Definition

Description Ċ The description of the point may be up to 16 characters

in length. The first 12 characters will appear on the faceplate display of a

console on the line immediately below the point tag. All 16 characters

may be used on a custom display. Any printable character may be used

in the description.

Device Ċ This is the tag of the Interactive or Computing controller

device on which this Direct Control Point resides. This is a read-only

field.

EU Descriptor Ċ The engineering units descriptor identifies the units of

the device or measured variable being controlled. Examples of this are

% OPEN or GPM. Units may be up to six characters in length.

High Scale Value Ċ The High Scale Value represents the 100-percent

value of the process variable, in engineering units. The valid range for

high scale value is any floating point number; however, it may not be the

same as the low scale value. Select the level in engineering units

corresponding to the maximum expected value of the process variable.

This configuration item may be changed using DDP #2, EU 100%.

Index Ċ The point index for this Direct Control Point. Normally, the first

point configured on the device is given the index 1, the next point 2, etc.

Computing Controllers may have 2 DCPs. 2-Wide IACs and 3-Wide

IACs with Discrete I/O may have 4 DCPs. 3-Wide IACs with Process I/O

and 4-Wide IACs may have 8 DCPs.

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Response Electronics CL6011B Especificaciones Pagina 93