Comparison And Switching Functions - Siemens SIPART DR24 Manual

1 Technical Description
1.5 Functional Description
1.5.7 Basic Functions (Arithmetic blocks b)

1.5.7.5 Comparison and Switching Functions

Differential amplifier
A = (E1 -- E2) ⋅ E3
With E3 = gain factor
Default: A = E1 -- E2
The differential amplifier is used primarily for forming
the control difference xd = w -- x with the possibility of
active direction reversal (normal/reversing) by
E3 = --1.000.
Switch for analog variables
E3 A
0 E1
1 E2
Switch for digital variables
E3 A
0 E1
1 E2
Comparator with adjustable hysteresis
(two--position switch, e.g. limit value sensor)
Inputs
E1 ≥ (E2 + H/2)
E1 < (E2 -- H/2)
If the input variables are formed by computing, the
comparator may respond shifted by 1 LSB due to the
computing error.
Response threshold (dead band)
A = 0 for |E1| ≤ |a|,
A = signum E1 ⋅ (|E1| -- |E2|) for |E1| > |a|
with a = 32 = response threshold
Limiter
The signal at E1 is limited to the values set with E2 and
E3.
E2 = lower limit
E3 = upper limit
With E2 ≥ E3 A is = E3
50
Output A
1 (H = |E3| = hysteresis)
0
b .F AMPL
--
.1
∩
ncon
+
-
ncon .2
∩
.3
∩
--1.000
b .F ASo
--
.1
ncon ∩
.2
ncon
∩
.3
#
Lo
b .F bSo
--
.1
#
ncon
.2
#
ncon
.3
#
Lo
CoMP
b .F
--
ncon
.1
∩
+
ncon
-
.2
∩
0.010
.3
∩
b .F dEbA
--
.1
ncon
∩
.2
0.010 ∩
b .F LiMi
--
.1
∩
ncon
.2
--0.050 ∩
.3
∩
1.050
SIPART DR24 6DR2410
C79000-G7476-C153-03
Manual
n ---
.A
∩
x
n ---
.A
∩
n ---
.A #
n ---
.A #
H
n ---
.A
2a ∩
n ---
.A
∩