Control Word And Status Word - ABB ACS880 Firmware Manual
Primary control program
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- Firmware manual (764 pages) ,
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378 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.
The contents of the Control word and the Status word are detailed on pages
381
and
382
respectively. The drive states are presented in the state diagram (page 383).
Debugging the network words
If parameter
50.12 FBA A debug enable
is set to Enable, 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.
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