Communication Profile - ABB ACS350 User Manual

The Control Word and the Status Word
The Control Word (CW) is the principal means of controlling the drive from a fieldbus
system. The Control Word is sent by the fieldbus controller to the drive. The drive
switches between its states according to the bit-coded instructions of the Control
Word.
The Status Word (SW) is a word containing status information, sent by the drive to
the fieldbus controller.
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.
Fieldbus network
1)
DCU profile
2)
Selection via fieldbus adapter configuration parameters (parameter group
COMM
Fieldbus adapter
Industry standard drive
profile (e.g. PROFIdrive)
ABB Drives
Transparent 16
reference, actual
value scaling
Transparent 32
MODULE)
Data
1)
conversion
Data
1)
conversion
Optional
Drive
Select
2)
51 EXT
Fieldbus control with fieldbus adapter
271