ABB FPBA-01 Manual descargar pdf (Pagina 17)

Fieldbus control description

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.

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 19

presents the most important states (including the FBA profile state names). The FBA

Control Word (2.12 FBA MAIN CW) commands the transitions between these states

and the FBA Status Word (2.13 FBA MAIN SW) 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) 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.

Fieldbus references

References (FBA REF) are 16/32-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 torque or speed reference.

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ABB FPBA-01 Manual Pagina 17