ABB ACQ80-04 Series, Firmware Manual

Page: 227 / 270

Fieldbus control through the embedded fieldbus interface (EFB) 227
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 or the data is converted. See
section
About the control profiles (page 229 ).
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
About the
control profiles (page 229 ).

References
The references are provided by MPPT and does not depend on any user settings. For
more information on MPPT, see chapter
MPPT functionality on page 34 .

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
58.28 EFB act1 type and
58.29 EFB act2 type . See section About the control profiles (page 229 ).

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 … 58.114 Data I/O 14 define the addresses
from which the master either reads data (input) or to which it writes data (output).

Register addressing
The address field of Modbus requests for accessing holding registers is 16 bits. This
allows the Modbus protocol to support addressing of 65536 holding registers.
Historically, Modbus master devices used 5-digit decimal addresses from 40001 to
49999 to represent holding register addresses. The 5-digit decimal addressing limited
to 9999 the number of holding registers that could be addressed.
ACQ80 FW.book Page 227 Thursday, February 14, 2019 11:33 AM