Response Electronics CL6011B Specifikace stáhnout pdf (Strana 95)

4Ć13DCP Configuration

Original Ć June 1990 CE4.2:CL6211

Station Type Ċ The station type of a point primarily determines who

controls the set point and where the set point originates. Valid station

types include:

H Man H Aut/Man/DDC

H Aut/Man H Man/DDC

H Aut/Man/RSP H Aut/Man/DDC/Sup

H Aut/Man/Sup H Aut/Man/DDC/Sup/RSP

The valid station types for a point also depend upon the selected PCA

type. Refer to Table NO TAG (page NO TAG) for a list of valid PCA /

Station combinations.

Strategy Ċ The strategy field is a 16-character text field that can be

used to help group points together. For example, if the plant consists of

a boiler, a reactor, and a tank, the strategy field of each point could be

set to either Boiler", Reactor", or Tank". This data is not checked or

processed in any way, but points can be sorted by the strategy field.

4.3.2 Primary Control Algorithm (PCA)

Index Ċ The point index uniquely identifies this point, and, when

specified, may be used in place of the point tag to access this point.

Generally, the first Direct Control point that is configured is assigned

point index number 1, and the following points are numbered

consecutively.

Action Ċ Defines the relationship between a change in PV and a

corresponding change in IVP. When DIRECT is selected, an increase in

PV results in an increase in the IVP. When REVERSE is selected, an

increase in PV results in a decrease in the IVP. For example, if a valve is

controlling the flow of water through a pipe, the valve must close (IVP

decrease) as the flow increases beyond set point. Therefore, the

appropriate selection would be REVERSE. The loop action may be

changed using DDP #9, REV ACT?

ARW High Limit Ċ The Anti-Reset Windup (ARW) high limit sets the

upper limit for the anti-reset windup function of the PI/PID/I PCA. In a

situation where a Direct Control point has reached an output limit and the

integral action has been stopped to prevent windup, it may be desirable

to have the IVP move very rapidly once it comes off its limit. The ARW

function provides the option of having the integral term of the Direct

Control point decrease, or unwind, at a speed 16 times the normal reset

speed. This reduces the effects of reset windup on PV overshoot. The

valid range is -13.97 to 113.97 percent, and is tunable using DDP #21,

ARW HILM.

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Response Electronics CL6011B Specifikace Strana 95