Fieldbus References - ABB ACS850 Manual

346 Control through a fieldbus adapter

Fieldbus references

References (FBA REF) are 16/32-bit signed integers. A negative reference
(indicating reversed direction of rotation) is formed by calculating the two's
complement from the corresponding positive reference value. The contents of each
reference word can be used as torque or speed reference.
When torque or speed reference scaling is selected (by parameter
modesel / 50.05 Fb ref2
value consists of a 16-bit integer value and a 16-bit fractional value. The
speed/torque reference scaling is as follows:
Reference
Speed reference
Torque reference
modesel), the fieldbus references are 32-bit integers. The
Scaling
FBA REF / 65536
(value in rpm)
FBA REF / 65536
(value in %)
Notes
Final reference is limited by parameters
Maximum speed, 20.02 Minimum speed
21.09 SpeedRef min
Final reference is limited by torque limit
parameters 20.06...20.10.
50.04 Fb ref1
20.01
and
abs.