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Chapter 4
CIP Axis Attributes
312
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
Feedback Type
Feedback Resolution
Feedback Unit = Revs
Feedback Resolution
Feedback Unit = Meters
BiSS Digital
524288 cycles/rev
2097152 cycles/m
Integrated
131072 cycles/rev
2097152 cycles/m
SSI Sine/Cosine
1024 cycles/rev
4096 cycles/m
SSI AqB
1024 cycles/rev
4096 cycles/m
BiSS Sine Cosine
1024 cycles/rev
4096 cycles/m
Tamagawa Serial
131072 cycles/rev
655360 cycles/m
Stahl SSI
1024 cycles/rev
4096 cycles/m
Feedback n Cycle Interpolation
Usage
Access
Data
Type
Default
Min
Max
Semantics of Values
Required - E
Not LT
Set/GSV
UDINT
4
DB
1
max
dint
Feedback Counts / Feedback Cycle
The Feedback n Cycle Interpolation attribute is the number of interpolated
Feedback Counts per Feedback Cycle. For a Digital AqB device the device's
feedback interface hardware can generally support interpolation values of 1, 2, or
4. For a Sin/Cos, Hiperface, EnDat, or Resolver feedback device the number is
generally much larger and determined by the interpolation capability of the device
feedback interface hardware. A value of 1024 is typical in this case. For digital
serial, for example, SSI, or parallel absolute feedback device interfaces, this value is
always 1 since there is no opportunity for device-based interpolation. The effective
resolution of the feedback device in Feedback Counts per Feedback Unit is
determined by the combination of the Feedback Cycle Resolution and the
Feedback Cycle Interpolation attribute values.
Feedback n Turns
Usage
Access
Data
Type
Default
Min
Max
Semantics of Values
Required - E
Rotary Absolute
Set/GSV
UDINT
1
DB
1
max
dint
Feedback Units (Rev)
The Feedback n Turns attribute is the maximum number of shaft turns specified
for a rotary absolute feedback device to maintain its absolute position reference.
Typical rotary absolute feedback devices specify an absolute number of turns that
typically range from 1 to 4096 in powers of 2. This attribute can be used by the
control system to determine the maximum Feedback Count range of the absolute
feedback device, this being the product of the feedback cycle resolution,
interpolation, and turns.