Fieldbus control through a fieldbus adapter 485
References
References are 16-bit words containing a sign bit and a 15-bit integer. A negative
reference (indicating reversed direction of rotation) 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 drive control panel and a fieldbus adapter module. In order to
have the drive controlled through the fieldbus, the module must be defined as the
source for control information such as reference. This is done using the source
selection parameters in groups
22 Speed reference selection
,
26 Torque reference
chain
and
28 Frequency reference chain
.
Debugging the network words
If parameter
50.12
FBA A debug mode
is set to
Fast
, the references received from
the fieldbus are displayed by
50.14
FBA A reference 1
and
50.15
FBA A reference 2
.
Scaling of references
Note:
The scalings described below are for the ABB Drives communication profile.
Fieldbus-specific communication profiles may use different scalings. For more
information, see the manual of the fieldbus adapter.
The references are scaled as defined by parameters
46.01
…
46.04
; which scaling is
in use depends on the setting of
50.04
FBA A ref1 type
and
50.05
FBA A ref2 type
.
The scaled references are shown by parameters
03.05
FB A reference 1
and
03.06
FB A reference 2
.
46.01
(with speed reference)
46.02
(with frequency reference)
0
-20000
20000
Drive
Fieldbus
0
10000
-10000
46.03
(with torque reference)
-(
46.01
) (with speed reference)
-(
46.02
) (with frequency reference)
-(
46.03
) (with torque reference)
ACS380 FW.book Page 485 Friday, May 4, 2018 4:18 PM
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