Ramp-Function Generator - Siemens SIMODRIVE POSMO A User Manual

5 Description of the Functions
5.2 "Speed setpoint" mode (P700 = 1) (from SW 2.0)
Transmission
elements
Input, n–set
(PZD2)
7FFF
PROFIBUS–DP
...
1000
(STW)
...
0000
...
8000
Act. value (PZD2)
7FFF
...
PROFIBUS–DP
1000
...
(ZSW)
0000
...
8000
Fig. 5-1 Transfer, speed setpoint/actual value
5.2.2 Ramp–function generator
General
How do the
software limit
switches function?
5-136
The speed setpoint and the speed actual feedback value are trans-
ferred using PZD data.
Primary speed
setpoint:
PZD2
np =
hex
(= P880)
hex
hex
hex
Hex value to feed back
hex
the speed actual value:
(= P880)
hex
nact =
( )
hex
hex
hex
Reader's note
PZD data, refer to Chapter 4.2.
The ramp–function generator is used to limit the acceleration when the
speed setpoint changes as a step function.
POSMO A transfers the speed setpoint from the DP master to the
ramp–function generator as soon as it is in a specific state of the
PROFIBUS state machine (refer to Chapter 4.2.2).
At run–up, the software limit switches are automatically de–activated
(P6 = P7) and a rotary axis parameterized. In this case, P1 is set to the
maximum value which corresponds to the parameterized values P2 and
P3.
P1 may not be set to zero in "speed setpoint" mode so that no more
traversing range limits can be activated. Referencing is not possible.
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
Limiting (P8)
S S
P880 P3
If +/– np
4096
is greater/less
than +/– P8
––> limit
to +/– P8
S
nact 4096
S
P880 P3
Speed actual
value
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02.99 05.03
Speed
setpoint
Ramp–up
generator
M