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Fieldbus control through the embedded fieldbus interface (EFB) 611
2
Data conversion if parameter
About the control profiles (page
3
If parameter
• The sources of the status word and actual values are selected by parameters
58.30...58.32
cording to reference type), and
• The control word is displayed by
￭
Control word and Status word
The Control Word (CW) is a 16-bit or 32-bit packed boolean word. It is the principal
means of controlling the drive from a fieldbus system. The CW is sent by the
fieldbus controller to the drive. By drive parameters, the user selects the EFB CW
as the source of drive control commands (such as start/stop, emergency stop,
selection between external control locations 1/2, or fault reset). The drive switches
between its states according to the bit-coded instructions of the CW.
The fieldbus CW is either written to the drive as it is (see parameter
transparent control
profiles (page
612).
The fieldbus Status Word (SW) is a 16-bit or 32-bit packed boolean word. It contains
status information from the drive to the fieldbus controller. The drive SW is either
written to the fieldbus SW as it is or the data is converted. See section
control profiles (page
￭
References
EFB references 1 and 2 are 16-bit or 32-bit signed integers. The contents of each
reference word can be used as the source of virtually any signal, such as the speed,
frequency, torque or process reference. In embedded fieldbus communication,
references 1 and 2 are displayed by
respectively. Whether the references are scaled or not depends on the settings of
58.26 EFB ref1 type
profiles (page
612).
￭
Actual values
Fieldbus actual signals (ACT1 and ACT2) are 16-bit or 32-bit signed integers. They
convey selected drive parameter values from the drive to the master. Whether the
actual values are scaled or not depends on the settings of
58.29 EFB act2
type. See section
￭
Data input/outputs
Data input/outputs are 16-bit or 32-bit words containing selected drive parameter
values. Parameters
from which the master either reads data (input) or to which it writes data (output).
58.25 Control profile
58.25 Control profile
(otherwise, actual values 1 and 2 are automatically selected ac-
word), or the data is converted. See section
612).
3.9 EFB reference 1
and
58.27 EFB ref2
About the control profiles (page
58.101 Data I/O 1
is set to
612).
is set to Transparent,
6.5 EFB transparent control
type. See section
...
58.124 Data I/O 24
ABB
Drives. See section
word.
6.5 EFB
About the control
About the
and
3.10 EFB reference 2
About the control
58.28 EFB act1 type
612).
define the addresses
and
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