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3Ć5 Theory of Operation: Point Processing

Original Ć June 1990 CE4.2:CL6211

3.3 Direct Control Points

The IAC and Computing controllers provide control of continuous

processes through the use of direct control points (DCPs). The primary

components of each DCP are a Primary Control Algorithm (PCA), and a

station type. The PCA contains all of the intelligence (e.g., PID equations)

necessary to transform the DCP's inputs into outputs. The station type is

used to define the modes of operation (i.e., Manual, Automatic, etc.) that

are valid for the point. The PCA and station also contain several

functions, such as anti-reset windup, that can be configured to provide

proper control of the process. Some of the functions, such as restart

values, are common to both the PCA and station.

3.3.1 Primary Control Algorithms

Direct control points (DCPs) are available in five basic versions:

H Manual Loader

H Bias and Gain

H High/Low Signal Selector

H Proportional-Derivative with Bias

H Proportional-Integral-Derivative

Five advanced DCPs are also available:

H Error-Squared Proportional-Integral-Derivative

H Notch Gain Proportional-Integral-Derivative

H Adaptive Gain Proportional-Integral- Derivative

H Control Sequence

H Control Sequence with Bias

The names of these DCP versions are referred to as the Primary Control

Algorithms (PCAs). The details of these PCAs are described in the

following sections.

3.3.1.1 Manual Loader

The Manual Loader algorithm is the simplest type of DCP available in the

Controller, and allows for manual control of the Implied Valve Position

(IVP) of the DCP, i.e., the signal to the final control element will always

equal the IVP value that is entered. The manual loader also allows an

analog value to be monitored and displayed as the process variable of

the DCP, and allows a process set point to be entered. While the

process variable and set point of the manual loader DCP do not affect

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