References; Scaling - ABB FCAN-01 User Manual

106 Communication profiles
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References

References are 16-bit signed two's complement integers. A
negative reference indicates a reverse direction of rotation.
ABB drives can receive control information from multiple sources
including analogue and digital inputs, the drive control panel and a
communication module (for example, FCAN-01). 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 ACS880 the speed reference (REFx) in
decimal (0...20000) corresponds to 0...100% of the speed scaling
value (as defined with drive parameter, eg, ACS850 parameter
19.01 Speed scaling, ACS880 parameter 46.01 Speed scaling).
In ACS355, drive parameter REFx MIN may limit the actual
minimum reference.
Fieldbus
REF2: 10000
REF1: 20000
0
REF2: -10000
REF1: -20000
Drive
REFx MAX / Speed scale
REFx MIN
-(REFx MIN)
-(REFx MAX) / Speed scale