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484 Fieldbus control through a fieldbus adapter
Control word and Status word
The Control word is the principal means for controlling the drive from a fieldbus
system. It is sent by the fieldbus master station to the drive through the adapter
module. The drive switches between its states according to the bit-coded instructions
in the Control word, and returns status information to the master in the Status word.
For the ABB Drives communication profile, the contents of the Control word and the
Status word are detailed on pages
487
and
488
respectively. The drive states are
presented in the state diagram (page
489
). For other fieldbus-specific communication
profiles, see the manual of the fieldbus adapter.
For more details on the Control word, go to page
487
, and on the Status word, got to
page
488
. The drive states are presented in the state diagram on page
489
.
Debugging the network words
If parameter
50.12
FBA A debug mode
is set to
Fast
, the Control word received from
the fieldbus is shown by parameter
50.13
FBA A control word
, and the Status word
transmitted to the fieldbus network by
50.16
FBA A status word
. This “raw” data is
very useful to determine if the fieldbus master is transmitting the correct data before
handing control to the fieldbus network.
ACS380 FW.book Page 484 Friday, May 4, 2018 4:18 PM
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