Fieldbus control through a fieldbus adapter 471
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 474 and
476 respectively. The drive states are presented in the state diagram (page 477).
Debugging the network words
If parameter 50.12 FBA A debug mode is set to Fast [1], 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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