Feedback polarity negative, Servo polarity negative, Servo loop block diagrams – Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual User Manual
Page 331
Publication 1784-UM003A-EN-P – June 2003
Motion Object Attributes 323
Feedback Polarity Negative
This Feedback Polarity Negative bit attribute controls the polarity of the
encoder feedback and, when properly configured, insures that when the axis is
moved in the user defined positive direction that the axis Actual Position value
increases. This bit can be configured automatically using the MRHD and
MAHD motion instructions.
Servo Polarity Negative
This Servo Polarity Negative bit attribute controls the polarity of the servo
output to the drive. When properly configured along with the Feedback
Polarity Negative bit, it ensures that when the axis servo loop is closed it is
closed as a negative feedback system and not an unstable positive feedback
system. This bit can be configured automatically using the MRHD and
MAHD motion instructions.
Servo Loop Block Diagrams
The following section illustrates the various servo loop configurations that are
supported with the first release of this object. Which of these servo loop
topologies is in effect depends on the current settings of the of the Servo
Loop Configuration and External Drive Type attributes.