72 Unidrive M SI-PROFIBUS User Guide
Issue Number: 3
12.9 PROFIdrive control word
The PROFIdrive control word consists of sixteen control bits some of which are
reserved.
Table 12.3 PROFIdrive control word bit functions
Bit Value Function Description
0
1
No Ramp
Stop
Ramp Stop command is withdrawn.
0 Ramp Stop
The motor decelerates under ramp control using
deceleration rate1 (Pr 02.021); inhibits the drive and go
to ‘Ready For Switching On’ state.
1
1
No Coast
Stop
Coast Stop command is withdrawn.
0Coast Stop
Voltage disconnected; inhibit the drive output stage.
Main contactor is de-energized (if available), and the
drive goes into the ‘Switching On Inhibited’ status: Motor
coasts down
2
1
No Quick
Stop
Quick Stop command is withdrawn.
0Quick Stop
The motor decelerates under ramp control using
deceleration rate2 (Pr 02.022); inhibits the drive and go
to ‘Switching On Inhibited’ state.
3
1
Enable
Operation
Enable the drive and accelerate to the specified setpoint.
0
Disable
Operation
Inhibit the drive. Drive coasts down (ramp-function
generator to zero or tracking), and into the Switched On’
status.
4
1 Enable RFG Enables the ramp function generator output.
0Reset RFG
Ramp function generator output is set to zero. Main
contactor remains in, the drive is not isolated from the
supply, drive ramps down along the current limit or at the
DC bus voltage limit.
5
1
Unfreeze
RFG
Unfreezes the ramp function generator output.
0 Freeze RFG
Freezes the current setpoint from the ramp function
generator.
6
1
Enable
Setpoint
Selected value at the ramp function generator input is
switched in.
0
Inhibit
Setpoint
Selected value at the ramp function generator input is
set to 0.
7
1
Fault
Acknowledge
Group signal is acknowledged at a positive edge; the
drive is in the ‘fault’ status until the fault has been
removed and then goes into ‘switch-on inhibit’ state.
0 No meaning
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