Siemens CU240B-2 Parameter Manual page 496

Switch-on delay
pxxxx
x
T 0
x y
The digital signal x must have the value "1" without any interruption
during the time T before output y changes to "1".
T T T T
x
y
Switch-off delay
pxxxx
x
0 T
x y
The digital signal x must have the value "0" without interruption
during the time T before output y changes to "0".
T T T T
x
y
Delay (switch-on and switch-off)
pxxxx pxxxx
x
T T
x y
1 2
pxxxx pxxxx
The digital signal x must have the value "1" without interruption
during time T1 or must have the value "0" during time T2 before
output y changes its signal state.
T T T T
1 1 2 2
x
y
1 2
Explanations for the function diagrams
Explanation of the symbols (Part 3)
Switch symbol
pxxxx
y
Simple changeover switch
T 0
0
The switch position is shown according to
the factory setting
pxxxx
1 (in this case, switch position 1 in the default
state on delivery).
PT1 element
pxxxx
y
y
t
0 T
Delay element, first order.
pxxxx
pxxxx = time constant
PT2 low pass
Natural frequency,
denominator
fn_n
pxxxx
y
|y|
T T
1 2
x
fn
Transfer function
1
H(s) =
.
2
s
2 D_n
+
2 fn_n
2 fn_n
3 4
2nd-order filter (bandstop/general filter)
Natural frequency,
Natural frequency,
Used as bandstop filter
- center frequency fs:fn_z = fs
- bandwidth f_B:
Damping,
denominator
D_n
Transfer function when used as general filter
pxxxx
2
H(s) =
2
D
y
Analog adder can be activated
f
x
1
x
2
.
s + 1
I
5 6
FP_1022_97_61.vsd
13.12.2010
Damping, numerator
numerator
D_z
fn_z
pxxxx
pxxxx
|y| fs
x y
f_B
f
2nd Order Filter
Damping,
denominator denominator
fn_n D_n
pxxxx pxxxx
fn_n = fs
D_z = 0
f_B
D_n =
2 • fs
.
s .
2 D_z
2
+ s + 1
fn_z 2 fn_z
.
2
s .
2 D_n
+ s + 1
fn_n 2 fn_n
The following applies to I = 1 signal: y = x1 + x2
y
The following applies to I = 0 signal: y = x1
7
Function diagram
G120 CU240B/E-2
V4.4
8
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