Allen-Bradley PowerFlex 527 Reference Manual

CIP Axis Attributes
Chapter 4
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018 311
Feedback n Cycle Resolution
Usage Access Data
Type
Default Min Max Semantics of Values
Required - E
Not LT
Set/GSV UDINT
Default
Feedback
Resolution
DB
1 max
dint
Cycles/Unit (Rotary): Feedback Cycles
/ Rev
Cycles/Unit (Linear): Feedback Cycles /
m
Unit/Cycle (Linear): nm / Feedback
Cycle
Bits/Unit (Rotary): 2
n
Cycles / Rev
(Rotary) where n = #Bits
The Feedback n Cycle Resolution attribute determines the resolution capability of
the associated feedback device. Units for this attribute are determined by the
Feedback n Resolution Unit and the rotary or linear Feedback n Unit as shown in
the Semantics column. For rotary feedback devices, this value is expressed as the
number of Feedback Cycles per Revolution of the device, or alternatively by the
number of bits in the binary position representation of the device per Revolution.
For linear feedback devices, this value represents the either the number of
Feedback Cycles per Meter (m), or the number of nanometers (nm) per Feedback
Cycle.
Cycles for a Digital AqB device represent the 'line' resolution of the encoder.
Cycles for a Sin/Cos device represent the sinusoidal 'cycle' resolution of the
encoder. Cycles for a Resolver is the 'pole' count of the device. For digital serial
(e.g. SSI) or parallel absolute feedback devices, Cycles represent the 'step' or 'count'
resolution of the device.
The default Feedback Resolution value used for the Feedback Cycle Resolution
attributes depends on the associated Feedback Type and Feedback Unit selection
according to the following table:
Default Feedback Resolution vs. Feedback Type and Feedback Unit
Feedback Type Feedback Resolution
Feedback Unit = Revs
Feedback Resolution
Feedback Unit = Meters
Digital AqB 1024 cycles/rev 4096 cycles/m
Digital Parallel 1024 cycles/rev 4096 cycles/m
Sine/Cosine 1024 cycles/rev 4096 cycles/m
Hiperface 1024 cycles/rev 4096 cycles/m
EnDat Sine/Cosine 2048 cycles/rev 8192 cycles/m
EnDat Digital 131072 cycles/rev 655360 cycles/m
Resolver 2 cycles/rev 8 cycles/m
SSI Digital 524288 cycles/rev 2097152 cycles/m
LDT - -
Hiperface DSL 131072 cycles/rev 655360 cycles/m

Allen-Bradley PowerFlex 527 Specifications

General

Brand	Allen-Bradley
Model	PowerFlex 527
Category	Controller
Language	English