Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 128)

Publication 1784-UM003A-EN-P – June 2003
120 Naming & Configuring Your Motion Axis
Feedback Polarity
The polarity of the encoder feedback, this field is automatically set by
executing either the Feedback Test or the Output & Feedback Test:
• Positive
• Negative
Note: When properly configured, this setting insures that axis Actual
Position value increases when the axis is moved in the user defined
positive direction. This bit can be configured automatically using the
MRHD and MAHD motion instructions.
Output Polarity
The polarity of the servo output to the drive, this field is automatically set by
executing the Output & Feedback Test:
• Positive
• Negative
Note: When properly configured, this setting and the Feedback Polarity
setting insure 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.
Test Marker
Runs the Marker test, which ensures that the encoder A, B, and Z channels are
connected correctly and phased properly for marker detection. When the test
is initiated, you must manually move the axis one revolution for the system to
detect the marker. If the marker is not detected, check the encoder wiring and
try again.
ATTENTION
!
Modifying automatically input polarity values by running
the Feedback or Output & Feedback Tests can cause a
runaway condition resulting in unexpected motion, damage
to the equipment, and physical injury or death.