Arithmetic Ar1 To Ar6; Function Transmitter Fu1 And Fu2; Maximum Value Selection Ma1 To Ma3 - Siemens SIPART DR22 Manual

Manual
The individual function blocks are described below.

1.5.2.1 Arithmetic Ar1 to Ar6

Ar1 to Ar6
Ar .F
E1
ncon Ar .1
E2
ncon
Ar .2
E1 · E2+E3-E4
E3
0.000
Ar .3
E5
0.000
Ar .4
E4
1.000
Ar .5
E5
Figure 1-7 Function block Arithmetic Ar1 to Ar6
-- With this function block the four basic arithmetic functions are implemented with appropriate
assignment of inputs 0 and 1 respectively. The preset E3=E4=0, E5=1 gives A = E1×E2.
-- Typical process-technical applications are dosing or evaluation (E1×E2), range fade-outs
(E1×E2+E3) or differentiations (E3 - E4).

1.5.2.2 Function transmitter Fu1 and Fu2

Fu1, Fu2
Fu .F
A
E
ncon
Fu .1
-10, 0, 10 bis 90, 100, 110oFPA
Figure 1-8 Function block function transmitter
The function transmitter assigns every value of the input variable E in the range from -10 % to
+110 % an output variable A in the range from -199,9 % to +199,9 % with the function entered
by the user: A = f(E). The function is entered by the parameters "vertex value 1 to 13" for -10 %
to +110 % of E in intervals of 10 %. Parabolae are set by the computing program between
these vertex values which interlink tangentially the vertex values so that a constant function is
produced. The vertex values at -10 % and +110 % of E are required for the overflow. The last
rise remains constant in the case of further overmodulation of E. When used as a linearizer for
the displays, the linearization function is entered by the 13 vertex values so that the series
circuiting of the sensor function gives a linear equation with the linearization function
(see chapter 1.5.4, figure 1-20 to figure 1-23, page 46).

1.5.2.3 Maximum value selection MA1 to MA3

MA1.F to MA3.F
MA .F
E1
MA .1
ncon
E2
Max
ncon
MA .2
E3
0.050
MA .3
Figure 1-9 Function block maximum value selection
With the preset the greater value of E1 or E2 is connected through to A and at the same time
limited to the value of E3 (-5 %). Typical applications are maximum value selection circuits and
minimum value limitings.
SIPART DR22 6DR2210
C79000-G7476-C154-03
1.5.2
nr
E1 · E2 + E3 - E4
A =
A
Ar .6 E5 is limited to values ≥0.5 %.
nr
A
Fu .2
A = f(E)
E
nr
A = max (E1,E2, E3)
The greatest of the three input values is
A
MA .4
connected through to the output.
1.5 Functional description of the structure switches
Analog input signal processing freely connected (S4 = 1)
E5
1 Technical Description
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