116 Communication profiles
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
communication module (for example, FPBA-01). In order to have
the drive controlled through the fieldbus, the module must be
defined as the source for control information, for example,
reference.
Scaling
References are scaled as shown below.
Note: The values of REF1 MAX and REF2 MAX are set with drive
parameters. See the drive manuals for further information.
In ACSM1, ACS850 and ACQ810, the speed reference (REFx) in
decimal (0...20000) corresponds to 0...100% of the speed scaling
value (as defined with a drive parameter).
In ACS880 and ACS580 the speed reference (REFx) in decimal 0
corresponds to the speed ref min parameter (46.06 Speed ref
zero scaling in ACS880) or 0 if this parameter does not exist and
the speed reference (REFx) in decimal 20000 corresponds to the
speed scaling value (as defined with a drive parameter).
In ACS355, drive parameter REFx MIN may limit the actual
minimum reference.
DriveFieldbus
REFx MIN
-(REFx MIN)
REFx MAX / Speed scale
-(REFx MAX) / Speed scale
0
REF2: -10000
REF1: -20000
REF2: 10000
REF1: 20000
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