3 Functional description of the structure switches
3.10 Other functions of the standard controller
Manual
118
SIPART DR21
C73000-B7476-C143-08
A2 cannot be set greater than A1 and A4 not greater than A3.
The hysteresis HA is set in % in the range from 0.1 to 10 % and applies for all 4 limit values.
The function of the limit values (Min oder Max) always relates to the display, i.e. in the case of a
falling characteristic (dE< dA) the direction of effect is reversed. The set Min-function for
example becomes a Max-function related to the field signal.
S77
S76
Assignment
with
S
**
xd
x1
x
w
xv
wv
y
y1
y2
AI1
AI2
AI3
AI4
AI1A
AI2A
AI3A
AI4A
lxdl
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
A1
+
--
Min.
+
--
Max
S78
0
HA
A1
2
0
1
+
--
+
--
0
HA
A2
A2
A1≥A2
Min.
Max
S78
2
0
1
A3
+
--
Min.
+
--
Max
S79
0
HA
A3
2
0
1
+
--
+
--
0
HA
A4
A4
A3≥A4
Min.
Max
S79
2
0
1
Figure 3-34 Assignment and function of the limit value alarms (S76 to S79)
3.10.4 Linearizer (S21, oFPA)
The linearizer is freely assignable to an input AI1 to AI4 or the main controlled variable x1. If the
main controlled variable is linearized, the range dA to dE is decisive, otherwise there is a per-
centage reference to the measuring range. The curve is rounded at the support points.
Example:Thermocouple 300 to 1000 C with transmitter without linearizer
Set start of scale and full scale dA and dE and the decimal point dP in the structuring mode
oFPA for the display. Divide measuring range UA to UE including ± 10 % overflow in 10 % sec-
tions and determine partial voltages. L
-1
to L
11
are equidistant support points with 10 %-steps.
U
n
= n+U
A
withn=--1to11
U
E
-U
A
10
UA = 4.31 mV
UE = 48.33 mV
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