ABB ACQ80, Firmware Manual

Page: 372 / 390

372 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
373
and
375
respectively. The drive states are presented in the state diagram
(page
376
).
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
Flow calculation
on page
45
.
 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
.