434 Fieldbus control through a fieldbus adapter
Control word and Status word
The Control Word (CW) is a 16-bit or 32-bit packed boolean word. It is the principal
means for controlling the drive from a fieldbus system. The CW is sent by the fieldbus
controller to the drive. With drive parameters, you select the EFB CW as the source of
drive control commands (such as start/stop, emergency stop, selection between
external control locations 1/2, or fault reset).The drive switches between its states
according to the bit-coded instructions of the CW.
The fieldbus CW is either written to the drive as it is or the data is converted.
For more details on the Control word, go to page 437, and on the Status word, got to
page 438. The drive states are presented in the state diagram on page 439.
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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