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F
u
nct
ion
D
iag
ra
m
s
Exp
lan
ations for the
fun
c
tio
n
diag
ra
ms
2-
11
04
© Siemens AG
2007 All Rights Reserved
S
IN
A
MICS
S List Manua
l (
L
H1), 0
7
/2007
Fi
gure 2-3
1
024 – Expla
nation
o
f the symb
o
ls (Part 3)
- 1024 -
Function diagram
8
7
6
5
4
3
2
1
fp_1024_51_eng.vsd
DO: All objects
SINAMICS
08.05.07 V02.05.00
Explanations for the function diagrams - Explanation of the symbols (Part 3)
Switch-on delay
T
0
x
y
pxxxx
The digital signal x must have the value "1" without any interruption
during the time T before output y changes to "1".
2nd-order filter (bandstop/general filter)
Transfer function when used as general filter
Used as bandstop filter
- center frequency fs:
fn_z = fs
fn_n = fs
y
x
Natural frequency, numerator
fn_z
pxxxx
Damping, numerator
D_z
pxxxx
Natural frequency, denominator
fn_n
pxxxx
Damping, denominator
D_n
pxxxx
H(s) =
s
2 fn_z
2 fn_z
s
+
+
s
2 fn_n
.
.
2
fn_n
D_n
s
+
+
1
1
2
.
D_z
2
.
2
2
- bandwidth f_B:
D_z = 0
D_n =
PT1 element
t
y
Delay element, first order.
pxxxx = time constant
pxxxx
PT2 low pass
Transfer function
H(s) =
+
s
2
fn_n
.
2 fn_n
D_n
s +
1
2
.
2
1
Natural frequency, denominator
fn_n
pxxxx
Damping, denominator
D_n
pxxxx
y
x
f
|y|
fn
D
0
T
Switch-off delay
x
y
pxxxx
The digital signal x must have the value "0" without interruption during
the time T before output y changes to "0".
Delay (switch-on and switch-off)
T
1
T
2
T
0
pxxxx
0
T
pxxxx
x
y
x
y
The digital signal x must have the value "1" without interruption during
time T
1
or must have the value "0" during time T
2
before output y
changes its signal state.
x
y
T
1
T
2
x
y
pxxxx pxxxx
pxxxx pxxxx
x
T
T
T
T
y
T
T
x
y
x
T
T
y
T
1
T
1
T
2
T
2
f_B
fs
2
.
Analog adder can be activated
y
x
1
I
x
2
The following applies to I = 1 signal: y = x
1
+ x
2
The following applies to I = 0 signal: y = x
1
f
2nd Order Filter
|y|
fs
f_B