ABB ACS850 series, Руководство пользователя

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Control through a fieldbus adapter 345
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Control Word and 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.
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Actual values
Actual values (ACT) are 16/32-bit words containing information on selected
operations of the drive.
FBA communication profile
The FBA communication profile is a state machine model which describes the
general states and state transitions of the drive. The
State diagram on page 347
presents the most important states (including the FBA profile state names). The FBA
Control Word (parameter
02.22 FBA main cw – see page 108 ) commands the
transitions between these states and the FBA Status Word (parameter 02.24 FBA
main sw – see page 109 ) indicates the status of the drive.
Fieldbus adapter module profile (selected by adapter module parameter) defines how
the Control Word and Status Word are transmitted in a system which consists of
fieldbus controller, fieldbus adapter module and drive. With transparent modes,
Control Word and Status Word are transmitted without any conversion between the
fieldbus controller and the drive. With other profiles (e.g. PROFIdrive for FPBA-01,
AC/DC drive for FDNA-01, DS-402 for FCAN-01 and ABB Drives profile for all
fieldbus adapter modules), the fieldbus adapter module converts the fieldbus-specific
Control word to the FBA communication profile and Status Word from FBA
communication profile to the fieldbus-specific Status Word.
For descriptions of other profiles, see the User’s Manual of the appropriate fieldbus
adapter module.