Motor data, Feedback type, Feedback resolution – Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual User Manual
Page 389: Aux feedback ratio
Publication 1784-UM003A-EN-P – June 2003
Motion Object Attributes 381
Motor Data
The Motor Data attribute is a structure with a length element and an array of
bytes that contains important motor configuration information needed by the
drive to operate the motor. The length element represents the number of valid
data elements in the data array. The meaning of data within the data array is
understood only by the drive. The block of data stored in the Motor Data
attribute is derived at configuration time from an RSLogix 5000 motor
database file.
Feedback Type
The Motor and Aux Feedback Type attributes are used to provide the A-B
drive with specific device configuration information for the motor mounted or
auxiliary feedback device.
Feedback Resolution
The Motor and Aux Feedback Resolution attributes are used to provide the
A-B drive with the resolution of the associated feedback device in cycles.
These parameters also provide the Logix controller and drive with critical
information to compute conversion constants used to convert drive units to
feedback counts.
Aux Feedback Ratio
The Aux Feedback Ratio attribute represents the quantitative relationship
between auxiliary feedback device and the motor. For a rotary auxiliary
feedback device, this attributes value should be the turns ratio between the
auxiliary feedback device and the motor shaft. The Aux Feedback Ratio
attribute is used in range limit and default value calculations during
configuration based on the selected motor’s specifications. The value is also
used by the drive when running the dual feedback servo loop configuration.
GSV/SSV Access
Attribute Name
Data Type
Values
GSV
Motor Data
Struct {
INT;
SINT
[256]}
(Struct {length; data[ ]}
GSV/SSV Access
Attribute Name
Data Type
Values
GSV
Motor Feedback Type
Aux Feedback Type
INT
GSV/SSV Access
Attribute Name
Data Type
Values
GSV
Motor Feedback Resolution
Aux Feedback Resolution
DINT
Cycles per Rev (rotary device) or
Grid Constant (linear device)
GSV/SSV Access
Attribute Name
Data Type
Values
GSV
Aux Feedback Ratio
FLOAT
Aux Revs per Motor Rev