ABB ACS355 series, User Manual

Page: 345 / 436

Fieldbus control with fieldbus adapter 345

References
References (REF) are 16-bit signed integers. A negative reference (indicating
reversed direction of rotation) is formed by calculating the two’s complement from the
corresponding positive reference value. The contents of each reference word can be
used as speed or frequency reference.

Actual values
Actual values (ACT) are 16-bit words containing information on selected operations of
the drive.
Communication profile
The communication between the drive and the fieldbus adapter supports the DCU
communication profile. The DCU profile extends the control and status interface to 32
bits.
For the DCU profile Control and Status word contents, see section DCU
communication profile on page 333 .
Fieldbus
network
Fieldbus adapter
Data conversion
Drive
Industry standard drive
profile (eg, PROFIdrive)
Data conversion
ABB drives
Transparent 16
Optional reference,
actual value scaling
Transparent 32
Select
2)
1)
1)
1)
DCU profile
2)
Selection through fieldbus adapter configuration parameters (parameter group 51 EXT
COMM MODULE )