Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 130)

Publication 1784-UM003A-EN-P – June 2003
122 Naming & Configuring Your Motion Axis
Test Increment
Specifies the amount of distance traversed by the axis when executing the
Command & Feedback test. The default value is set to approximately a quarter
of a revolution of the motor in position units.
Drive Polarity
The polarity of the servo loop of the drive, set by executing the Command &
Feedback Test:
• Positive
• Negative
Note: Proper wiring guarantees that the servo loop is closed with
negative feedback. However there is no guarantee that the servo drive
has the same sense of forward direction as the user for a given
application. Negative Polarity inverts the polarity of both the command
position and actual position data of the servo drive. Thus, selecting
either Positive or Negative Drive Polarity makes it possible to configure
the positive direction sense of the drive to agree with that of the user.
This attribute 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.
Test Feedback
Runs the Feedback Test, which checks and, if necessary, reconfigures the
Feedback Polarity setting. 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 polarity values, automatically input by running
the Command & Feedback Test, can cause a runaway
condition.