Control Word And Status Word; References; Actual Values; Data Input/Outputs - ABB ACS880 Firmware Manual

544 Fieldbus control through the embedded fieldbus interface (EFB)


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 word), or the data is converted. See section
profiles (page 546).
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 546).


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
2 respectively. Whether the references are scaled or not depends on the settings of
58.26 EFB ref1 type
(page 546).


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 58.101 Data I/O 1
from which the master either reads data (input) or to which it writes data (output).
Control of drive outputs through EFB
The address selection parameters of the data input/outputs have a setting with which
the data can be written into a storage parameter in the drive. These storage
parameters are readily selectable as signal sources of the drive outputs.
The desired values of the relay outputs (RO) and digital input/outputs (DIO) can be
written in a 16-bit word into
source of those outputs. Each of the analog outputs (AO) of the drive have a
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03.09 EFB reference 1
and 58.27 EFB ref2
About the control profiles
...
10.99 RO/DIO control
and
type. See section About the control profiles
58.28 EFB act1 type
(page 546).
58.124 Data I/O 24
word, which is then selected as the
06.05 EFB
About the control
About the
03.10 EFB reference
and
define the addresses