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40 Modbus/TCP – Communication profiles
The figure below illustrates the profile selection:
Modbus/TCP network
ABB Drives profile
Drive-specific profile
(with 16-bit words)
Drive-specific profile
(with 32-bit words)
1) Can be used if the native profile is supported by the drive
The following sections describe the Control word, the Status word, references and
actual values for the ABB Drives communication profile. Refer to the drive manuals
for details on the native profiles.
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 master in the Status word.
The contents of the Control word and the Status word are detailed below. The drive
states are presented on page 44.
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 on
page 44.
Bit
Name
0
OFF1_ CONTROL
FMBT-21
Profile selection:
ABB Drives
Data conversion
Transparent16
Optional reference/
1)
actual value scaling
1)
Transparent32
Value
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 inter-
locks (OFF2, OFF3) are active.
Drive
Native profile
STATE/Description
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