Siemens SINAMICS S120 - Page 95

Communication via PROFIBUS
Cyclic communication
4-95
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Table 4-3 Description of CTW1 (control word 1), continued
Bit BICOCommentsMeaning
9 Reserved - - -
Controlled by PLC
1
Controlled by PLC
This signal must be set so that the process data
transferred from the PROFIBUS master to the
slave is accepted and activated.
BI: p0854
10
Controlled by PLC
0
Not controlled by PLC
The process data transferred from the
PROFIBUS master are discarded by the slave,
i.e. they are assumed to be zero.
BI: p0854
Note:
This bit should not be set to “1” until the PROFIBUS slave has returned an appropriate status via
STW1.9 = “1”.
11
Direction of rotation
1 Direction of rotation changeover
BI: p1113
11
Direction
of
rotation
changeover
0 No direction reversal
BI: p1113
12 Reserved
Motorized potentiometer
1 Motorized potentiometer, setpoint, raise
13
Motorized potentiometer,
setpoint, raise
0
Motorized potentiometer setpoint raise not
selected
BI: p1035
Motorized potentiometer
1 Motorized potentiometer, lower setpoint
14
Motorized potentiometer,
lower setpoint
0
Motorized potentiometer setpoint lower not
selected
BI: p1036
14
Note:
If motorized potentiometer setpoint raise and lower are 0 or 1 simultaneously, the current setpoint
is frozen.
15 Reserved - - -
CTW2 (control word 2)
See function diagram [2444]