Yokogawa JUXTA MXT - Manual (Page 5)

5 IM 77J04X13-01E 2nd Edition Nov 30, 2005-00
6.5 MXT-U Square Root Extraction
This computing unit extracts square root of three inputs using the fol-
lowing expression.
“With input limit function” or “without input limit function” can be set for
the input signals X1, X2 and X3. And lowcut point can be set for the
computation result.
Y= K4 ·
(K1 · X1+A1) · (K2 · X2+A2)
(K3 · X3+A3)
+A4
where Y (Output): Output signal (%)
X1 to X3 (Input-1 to Input-3): Input signal (%)
K1 to K4: Gain (no unit)
A1 to A4: Bias (%)
With input limit function: Low limit 0%, high limit 100%
● Gain setting (K1 to K4): Set the gain (K1 to K4) in the fixed con-
stants (H01 to H04).
K1 to K4=
±
320 corresponds to H01 to H04=
±
32000%.
Setting range: − 320 to + 320
Number of significant digits: 4
Minimum unit: 0.00001
● Bias setting (A1 to A4): Set the bias (A1 to A4) in the fixed con-
stants (H05 to H08).
A1 to A4=
± 32000% corresponds to H05 to H08= ± 32000%.
Setting range:
−
32000 to
+
32000%
Number of significant digits: 4
Minimum unit: 0.001%
● Lowcut point setting:
Set the lowcut point in the fixed constant (H09).
Setting range: 0 to 100%; if the computation result is the lowcut
point or less, Input (X1)=Output (Y1).
Decide gain and bias so as not to exceed
±
3.4x10 38 % during compu-
tation. Gain, bias and computation results are 4 significant digits.
● Limit of input signal:
The input limit function limits the input signals X1 to X3 between
0% and 100%.
Set the input limit function in the fixed constant (H10).
With input limit function: H10=100%
Without input limit function: H10=0%
The fixed constants (H01 to H10) can be changed using the
Handy Terminal.
● Computation accuracy: ± 0.1%
However, input (X1) vs. output when K1=K2=K3=K4=1, and
A1=A2=A3=A4=0%, and inputs (X2, X3) are fixed at 100%.
6.6 MXT-V High Selector
This computing unit selects the highest signal out of three input sig-
nals (X1, X2, and X3) or out of two input signals (X1 and X2) to output
it (Y).
Set the high selector of three inputs or two inputs in the fixed constant
(H01).
3-input high selector: H01=0%
2-input high selector: H01=200%
6.7 MXT-W Low Selector
This computing unit selects the lowest signal out of three input signals
(X1, X2, and X3) or out of two input signals (X1 and X2) to output it
(Y).
Set the low selector of three inputs or two inputs in the fixed constant
(H01).
3-input low selector: H01=0%
2-input low selector: H01=200%