YOKOGAWA F3CU04-0S, User Manual

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C3-12
IM 34M06H62-02E 2nd Edition : June 2008-00
C3.7 Broken-line Biasing
The broken-line biasing function adds different bias values to input values depending on
their magnitude.
This function is useful for correcting offset or gain error (due to sensor characteristics,
degradation or other reasons) over parts of an input range.
As shown in the figure below, by specifying the input values (X) and corresponding bias
values (Y) for any three points, bias correction is performed throughout the input range.
Use parameters X1 to X3 to specify three input values, and parameters Y1 to Y3 to
specify their corresponding bias values.
Input
Output
Output with
no biasing
X1
Y1
Y3
Y2
Broken-line bias
Biased output
(Input with broken-line bias added)
X2
X3
Figure C3.4 Broken-line Biasing Example
Table C3.11 Broken-line Biasing Parameters
Data Position Number
Symbol Description Unit Data Range
Default
Value Attribute Stored
Loop 1 Loop 2 Loop 3 Loop 4
173 373 573 773 X1 Broken-line input 1 Industrial unit -5.0%to105.0% of (SL to SH) SL RW

174 374 574 774 Y1 Broken-line bias 1 Industrial unit -(SH-SL) to (SH-SL) 0 RW

175 375 575 775 X2 Broken-line input 2 Industrial unit -5.0%to105.0% of (SL to SH) SL RW

176 376 576 776 Y2 Broken-line bias 2 Industrial unit -(SH-SL) to (SH-SL) 0 RW

177 377 577 777 X3 Broken-line input 3 Industrial unit -5.0%to105.0% of (SL to SH) SL RW

178 378 578 778 Y3 Broken-line bias 3 Industrial unit -(SH-SL) to (SH-SL) 0 RW

When using the broken-line biasing function, you must specify all broken-line bias related
parameters (X1 to X3, and Y1 to Y3). Furthermore, the specified input values (X1 to X3)
must be such that X1

X2

X3.
CAUTION