Helios PD2-6080/PD2-6081 Modbus
®
Scanners
Instruction Manual
62
Math Functions (
nmath
)
The
Math
menu is used to select the math function
that will determine the channels’ C1-C4 value. These
math functions are applied to PVs and other math
channels. The results are displayed by selecting
Display Channel C (
d Ch C
) in the
Display
menu.
Most math functions may be applied to all PVs: For
example, it is possible to add up to 16 PVs and
calculate the total volume of all the tanks in a field.
The Math2 function allows for further calculations on
the results of other math channels (e.g. C4 = C2/C1).
The following math functions are available:
Name
Math Operation
(Examples)
(P = Adder, F = Factor)
Setting
Addition
(PV1+PV2+P)*F
Sunm
Difference
(PV1-PV2+P)*F
diF
Absolute
difference
((Abs(PV1- PV2)+P)*F
diFAbS
Average
(((PV1+PV2)/2)+P)*F
AVG
Multiplication
((PV1*PV2)+P)*F
Nmulti
Division
((PV1/PV2)+P)*F
diVide
Max PV
Max value of all
selected PVs
Hi-pV
Min PV
Min value of all
selected PVs
Lo-pV
Draw
((PV1/PV2)-1)*F
drAuw
Weighted
average
((PV2-PV1)*F)+PV1
uwavg
Ratio
(PV1/PV2)*F
Ratio
Concentration
(PV1/(PV1+PV2))*F
Concen
Math 2
Math on other math
channels
Nmath2
Addition
C3 = (C1+C2+P)*F
Sunm
Difference
C4 = (C1-C2+P)*F
diF
Absolute
difference
C3 =
((Abs(C1- C2)+P)*F
diFAbS
Average
C4 =
(((C1+C2)/2)+P)*F
AVG
Multiplication
C3 = ((C1*C2)+P)*F
Nmulti
Division
C4 = ((C1/C2)+P)*F
diVide
Math Constants (
Const
)
The
Math Constants
menu is used to set the
constants used in the math channel. The math
functions include the selected PVs, as well as the
constants P (Adder) and the Factor F (Multiplier) as
indicated in the above examples.
The
Adder
constant (P) may be set from -99.999 to
999.999.
The
Factor
constant (F) may be set from 0.001 to
999.999.
The above chart details the math functions that may
be selected in the
Math Function
menu.
