Maths functions
The maths functions configurable by means of parameters Func.A and Func.b define two additional inputs Fin.A
and Fin.b, each starting with one or two operands.
The operands can be the main physical inputs (In.1/In.2), the auxiliary physical inputs (In.3/In.4) or the added
inputs themselves (Fin.A/Fin.b); the last case lets you put the two functions in cascade to create a more complex
added input.
Refresh time is 20ms.
The scale of the maths function derives from the scale of its operands; it cannot be changed, and is displayed on
the Inf menu (LoS.5/HiS.5 for Fin.A, LoS.6/HiS.6 for Fin.b).
The decimal point position on the math function scale derives from the decimal point positions of the operands
(min. dPS value of operands); it cannot be changed, and is displayed on the Inf menu (dPS.5 for Fin.A, dPS.6 for
Fin.b).
The maths function error code derives from the error code of the operands (first Err value other than zero of ope-
rands); it cannot be changed, and is displayed on the Inf menu (Err.5 for FIn.A, Err.6 for Fin.b).
Definition is by fixed formulas or by generic polynomial:
Fin.A =
(C1.A * In1.A)
C2.A
OPEr.A (C3.A * In2.A)
C4.A
C5.A
with
Maths inputs Fin.A and Fin.b can be used as normal inputs in defining the process variable PV, remote
setpoint, remote manual, alarms or quantities to be retransmitted.
Example: to display the strings corresponding to alarms 1, 2, 4 on display SV and 3, 5 on display F, you have to set:
Sdss.P = 1 + 2 + 8 = 11
Sds.f = 4 + 16 = 20
Sds.PU = 0
In1.A / In2.A: In.1, In.2, In.3, In.4, Fin.b
C1.A / C3.A=C5.A: range [-9.99 ... 99.99]
OPEr.A: +,-,*,/
C2.A / C4.A: 0 -> 1, 1 -> 1/2, 2 -> 2
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