Modbus/TCP – Communication profiles 87
ABB Drives communication profile
Control word and Status word
The Control word is the principal means for controlling the drive
from a fieldbus system. It is sent by the fieldbus client station to the
drive through the adapter module. The drive switches between its
states according to the bit-coded instructions in the Control word
and returns status information to the client in the Status word.
The contents of the Control word and the Status word are detailed
below. The drive states are presented on page 91.
Control word contents
The table below shows the contents of the Control word for the
ABB Drives communication profile. The upper case boldface text
refers to the states shown in the state machine on page 91.
Bit Name Value STATE/Description
0 OFF1_
CONTROL
1 Proceed to READY TO OPERATE.
0 Stop along currently active deceleration
ramp. Proceed to OFF1 ACTIVE; proceed
to READY TO SWITCH ON unless other
interlocks (OFF2, OFF3) are active.
1 OFF2_
CONTROL
1 Continue operation (OFF2 inactive).
0 Emergency OFF, coast to stop.
Proceed to OFF2 ACTIVE, proceed to
SWITCH-ON INHIBITED.
2 OFF3_
CONTROL
1 Continue operation (OFF3 inactive).
0 Emergency stop, stop within time defined
by drive parameter. Proceed to OFF3
ACTIVE; proceed to SWITCH-ON
INHIBITED.
Warning: Ensure that motor and driven
machine can be stopped using this stop
mode.
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