Basics Of The Fieldbus Control Interface - ABB ACS880 Firmware Manual

194 Fieldbus control through a fieldbus adapter

Basics of the fieldbus control interface

The cyclic communication between a fieldbus system and the DC/DC converter unit
consists of 16/32-bit input and output data words. The DC/DC converter unit supports at
the maximum the use of 12 data words (16 bits) in each direction.
Data transmitted from the DC/DC converter unit to the fieldbus controller is defined by
parameters 152.01 FBA data in1
fieldbus controller to the DC/DC converter unit is defined by parameters
out1 ... 153.12 FBA data
Control word and Status word

The Control word is the principal means for controlling the DC/DC converter unit from a
fieldbus system. It is sent by the fieldbus master station to the DC/DC converter unit
through the adapter module. The DC/DC converter unit switches between its states
according to the bit-coded instructions on 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
respectively.
If parameter 150.12 FBA A debug mode
the fieldbus is shown by parameter
transmitted to the fieldbus network by
References

References are 16-bit words containing a sign bit and a 15-bit integer. A negative
reference is formed by calculating the two's complement from the corresponding positive
reference.
ABB drives can receive control information from multiple sources including analog and
digital inputs, the control panel and a fieldbus adapter module. In order to have the DC/DC
converter unit controlled through the fieldbus, the module must be defined as the source
for control information, eg, reference.
If parameter 150.12
displayed by 150.14 FBA A Reference REF1
Actual values

Actual values are 16-bit words containing information on the operation of the DC/DC
converter unit.
The types of the monitored signals are selected by parameters
and 150.08 FBA A act2
If parameter 150.12 FBA A debug mode
fieldbus are displayed by
... 152.12 FBA data
out12.
150.13 FBA A Control
150.16 FBA A Status
is set to Normal, the references received from the fieldbus are
type.
150.17 FBA A Actual value 1
in12. The data transmitted from the
is set to Normal, the Control word received from
Word, and the Status word
Word.
and 150.15 FBA A Reference
is set to Fast, the actual values sent to the
and 150.18 FBA A Actual value
153.01 FBA data
195 and
REF2.
150.07 FBA A act1 type
196
2.