Siemens SINAMICS S120 - Page 96

Communication via PROFIBUS
Cyclic communication
4-96
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Table 4-4 Description of CTW2 (control word 2)
Bit
Meaning Comments BICO
0 Drive data set selection
DDS bit 0
- Drive data set selection (5-bit counter)
For more information about data sets, see
p0820[0]
1
Drive data set selection
DDS bit 1
-
For
more
information
about
data
sets
,
see
Section 7.2.
p0821[0]
2 Drive data set selection
DDS bit 2
- p0822[0]
3 Drive data set selection
DDS bit 3
- p0823[0]
4 Drive data set selection
DDS bit 4
- p0824[0]
5...7 Reserved
8
Travel to fixed stop
1
Select “Travel to fixed stop”
The signal must be set before the fixed stop is
reached.
BI: p1545
8 Travel to fixed stop
1/0
Deselect “Travel to fixed stop”.
The edge is necessary in order to move away
from the fixed stop, i.e. upon direction reversal.
BI: p1545
9
10
11
Reserved – – –
12 Master sign-of-life bit 0 –
13 Master sign-of-life bit 1 –
User data integrity (4 bit counter)
CI: p2045
14 Master sign-of-life bit 2 –
User data integrity (4-bit counter) CI: p2045
15 Master sign-of-life bit 3 –
NSETP_A (speed setpoint A (16-bit))
S Speed setpoint with a 16-bit resolution with sign bit.
S Bit 15 determines the sign of the setpoint:
– Bit = 0 –> positive setpoint
– Bit = 1 –> negative setpoint
S The speed is normalized via p2000.
NSETP_A = 4000 hex or 16384 dec  speed in p2000