252 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 253 and
255 respectively. The drive states are presented in the state diagram (page 256).
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.
References
The references are provided by MPPT and does not depend on any user settings. For
more information on MPPT, see chapter MPPT functionality on page 34.
Actual values
Actual values are 16-bit words containing information on the operation of the drive.
The types of the monitored signals are selected by parameters 50.07 FBA A actual 1
type and 50.08 FBA A actual 2 type.
Debugging the network words
If parameter 50.12 FBA A debug mode is set to Fast [1], the actual values sent to the
fieldbus are displayed by 50.17 FBA A actual value 1 and 50.18 FBA A actual value
2.
ACQ80 FW.book Page 252 Thursday, February 14, 2019 11:33 AM
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