The Fieldbus Control Interface; The Control Word And The Status Word; References; Actual Values - ABB ACS350 User Manual

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The fieldbus control interface

The communication between a fieldbus system and the drive consists of 16-bit input
and output data words (with ABB Drives profile) and 32-bit input and output words
(with DCU profile).

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 (e.g. reverse
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, frequency, torque or process reference.

Actual Values

Actual Values (ACT) are 16-bit words containing selected values of the drive.
Fieldbus control with embedded fieldbus