3.13 Signal Characterizer Block; Execution; Figure 16: Signal Characterizer Block - Honeywell ST700 User Manual

3.13 Signal Characterizer block

The Signal Characterizer block describes the input/output relationship for any type of
function. The block has two paths, each with an output that is a non-linear function of the
corresponding input. The non-linear function is configured based on a single look-up table
with 21 arbitrary x-y pairs. To use the block in a control or process signal path, the status of
an input is provided to the corresponding output. To use the backward control path, the
block provides an option to swap the axes of the function.
The block calculates OUT_1 from IN_1 and OUT_2 from IN_2 using a curve given by the
co-ordinates:
[x1; y1], [x2; y2] ... [x21; y21]
Where,
•
x is the Input, and
•
y is the Output.
The x-coordinates are given in engineering units of X_RANGE. The y-coordinates are
given in engineering units of Y_RANGE.

Execution

Figure 16 describes the components of the block. The output value is calculated by linear
interpolation between two points enclosing the input value. OUT_1 is associated to IN_1
and OUT_2 to IN_2 by the same curve, but there is no association between IN_1 and IN_2
or between OUT_1 and OUT_2.
Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Figure 16: Signal Characterizer Block

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