Response Electronics CL6011B Especificaciones Pagina 27

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3Ć7 Theory of Operation: Point Processing
Original Ć June 1990 CE4.2:CL6211
100%
0%
Process Variable
100%
0%
Process Variable
Direct Action Reverse Action
IVP
IVP
GAIN = 1/2
BIAS = 50
GAIN = 1
BIAS = 0
GAIN = 1
BIAS = -50
GAIN = 1
BIAS = -50
GAIN = 1
BIAS = 0
GAIN = 1/2
BIAS = 50
100% 100%
Figure 3Ć1 . Effects of Bias & Gain
3.3.1.3 High/Low Signal Selector
The High/Low Signal Selector algorithm is used to select an analog value
from one of four process variable inputs when in automatic mode, and
pass that value through the algorithm so that it becomes the IVP of the
point.
The signal selector is typically used in override applications where its
process variable inputs are the outputs of other points. For proper
operation, the signal selector and its associated points must have the
same increase open/close settings (e.g., a point that is configured as
increase open must be connected to a signal selector that is increase
open).
The signal selector can be configured to select the input that results in
the highest IVP for the point, or the input that results in the lowest IVP for
the point. A HIGH signal selector selects the input that will cause the
highest IVP; LOW selects the lowest IVP. HIGH would be the highest
voltage for an increase-open valve and the lowest voltage for an
increase-close valve.
The signal selector allows for one to four inputs to be compared. The
signal value of the selected" input channel becomes the point's process
variable, and the process variable input to the alarms. The IVP is written
into the set point value of the point, and is also used as the set point
input to the alarms.
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