Siemens SINAMICS S120 - Page 99

Communication via PROFIBUS
Cyclic communication
4-99
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
A_CTW1 (control word for A_INF)
See function diagram [8920].
Table 4-5 Description of A_CTW1 (control word for A_INF)
Bit
Meaning Comments BICO
0/1
ON
Pulse enable possible
0 ON/OFF1
0
OFF1
Reduce DC link voltage via ramp (p3566), then
pulse inhibit/line contactor open
BI: p0840
1
No OFF2
Enable possible
1
OFF2
0
OFF2
Immediate pulse cancellation and power-on
inhibit
BI: p0844
Note:
Control signal OFF2 is generated by ANDing BI: p0844 and BI: p0845.
2 Reserved - - -
3
Enable operation
1
Enable operation
Pulse enable is present
BI: p0852
3 Enable operation
0
Inhibit operation
Pulse inhibit is present
BI: p0852
4 Reserved - - -
Inhibit motor operation
1
Inhibit motor operation
Motoring operation as step-up converter is
inhibited.
BI: p3532
5
Inhibit motor operation
0
Enable motoring operation
Motoring operation as step-up converter is
enabled.
BI: p3532
Note:
When “Inhibit motoring operation” is present, power can still be taken from the DC link. The DC
link voltage is then no longer controlled. The voltage level is the same as the rectified value of the
current line voltage.
Inhibit regenerating
1
Inhibit regenerating
Regenerative operation is inhibited.
BI: p3533
6
Inhibit regenerating
0
Enable regenerative operation
Regenerative operation is enabled.
BI: p3533
Note:
If regenerative operation is inhibited and power is fed to the DC link (e.g. by braking the motor),
the DC link voltage increases (F30002).
Acknowledge error 0/1 Acknowledge error BI: p2103
7 Note:
Acknowledgement takes place at a 0/1 edge via BI: p2103 or BI: p2104 or BI: p2105.