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Function Generator
This CV type can be used to characterize a valve (Figure 4-8) or an input signal (Figure 4-9). You enter
a custom curve of up to 19 segments (20 X,Y coordinates). The input is compared with the X values
and its corresponding Y value becomes the output CVn OV. Interpolation between coordinates is
straight line. See Figure 4-7.
If the input value is outside the range of X values, the nearest X value is used, the output will be
clamped to the corresponding Y value and the displayed output value will flash.
Table 4-33 describes the Function Generator prompts. See Table 4-2 for additional prompts.
Prompt
RANGE LOW
RANGE HIGH
INPUT
X1, Y1, X2, Y2...X20,
Y20
FEEDBACK
Y6
Y5
Y3, Y4
Y1, Y2
X1
Figure 4-7 Function Generator Curve
Table 4-33 Function Generator Prompts
Range/Selections
OFF or number
OFF or number
OFF, analog parameter,
number
OFF or number
OFF, analog parameter,
number
Video Recorder – User Manual
Programming Function Blocks and Features
X2
X3
X4
Enter the output's lower display limit. Output is not clamped
or flashed when it exceeds this limit. Default value is Y1
value.
Enter the output's lower display limit. Output is not clamped
or flashed when it exceeds this limit. Default value is Y1
value.
This value will be compared with the X values of the curve.
The corresponding Y value will be the CV output.
Use these prompts to plot a curve using 2 to 20 X,Y
coordinates. X values must increase as Xn increases.
For valve characterization, select AO# BC to propagate the
back calculation (BC) value from a downstream Analog
Output. Also, program the upstream loop's feedback with
this CV's back calculation value (CV# BC). See Figure 4-8.
Attention: If feedback is programmed to an analog
parameter or a number, the X and Y values must define a
curve that is not bell shaped or complex. That is, all Y values
must be increasing or decreasing.
X5
X6
Definition
123
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