Function diagrams
Explanations of the function diagrams
2-376
Siemens AG 2004 All Rights Reserved
SINAMICS G List Manual, Edition 12.2004
Picture 2-2
1021 – Explanation of the symbols (Part 2)
- 1021 -
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fp_S01_1021_en.vsd
DO: All objects
SINAMICS G
17.12.04
V02.02.00
General - explanation of the symbols (part 2)
Symbols for logic functions
Pre-assigned binectors and connectors
Logical inversion
AND element with logical
inversion of an input signal
Symbols for computational and closed-loop
control functions
Sign reversal
y = -x
Absolute value generator
Absolute value generator: y = |x|
Divider
y =
2
1
x
x
Comparat
o
r
Output y = a logical "1", if the analog
signal x > 0, i.e. is positive
Threshold value switch 1 / 0
Limit value monitor, outputs at y a logical
"1" if x < s.
Changeover switch
The switch position acc. to factory setting is
shown.
(In this case, switch position 1 in the state
when supplied.)
Limiter
x is limited to the upper limit LU and the
lower limit LL and output at
y
.
The digital signals MLU and MLL have t
h
e
value "1", if the upper or lower limit is
active.
1
&
R/S flip-flop
S = setting input
R = reset input
Q = non-inverted output
= inverted output
Q
xy
xy
>0
-1
xy
x
2
x
1
y
S
Q
R
Q
p2900[D]
Fixed value_%_1
p2901[D]
Fixed value_%_2
-10 000.00...10 000.00 %
p2900[D] (0.00)
-10 000.00...10 000.00 %
p2901[D] (0.00)
% fixed setpoints
S
y
x
1
0
Threshold value switch 0 / 1
Limit value monitor, outputs at y a logical
"1" if x > s.
0
1
y
x
S
Symbols for computational and closed-
loop control functions
Differentiat
o
r
y =
dt
dx
Sample & Hold elemen
t
Sampling and hold element.
y = x if SET = 1
(this is not retentively saved at POWER
OFF)
1
0
pxxxx
LU
LL
MLL
MLU
xy
SET
S & H
xy
Fixed speed values
-210 000.000...210 000.000 RPM
pxx20[D] (0.000)
pxxxx[D]
Fixed value_n_1
-210 000.000...210 000.000 RPM
pxx21[D] (0.000)
pxxxx[D]
Fixed value_n_2
Fixed torque values
-100 000.00...100 000.00 Nm
p2930[D] (0.00)
p2930[D]
Fixed Value_M_1
dx
dt
x
y
Monitoring
Axxxxx
or
Fxxxxx
Symbol for monitoring
Monitoring
Located at the lower right in the Sheet.
Function diagram