472 Fieldbus control through a fieldbus adapter
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 [1], 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
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
DriveFieldbus
0
10000
-10000
46.03 (with torque reference)
-(46.01) (with speed reference)
-(46.02) (with frequency reference)
-(46.03) (with torque reference)
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