394 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 397 and
398 respectively. The drive states are presented in the state diagram (page 399).
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.
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