Rockwell Automation GMLC Reference Manual - Manual (Page 559)

Publication GMLC-5.2 - November 1999
522 Fault Variables
Each physical axis of the motion controller can be configured to respond
to encoder noise in different ways. If the encoder noise fault action is set
to STOP MOTION, then when encoder noise is detected, the axis
immediately decelerates to a stop at maximum deceleration without
disabling feedback or the drive enable output. If DISABLE DRIVE
is
selected, when encoder noise is detected, axis feedback is immediately
disabled, the servo amplifier output is zeroed, and the appropriate drive
enable output is deactivated.
If the transducer noise fault action is set to STATUS ONLY, encoder noise
faults must be handled within the GML Commander diagram. In general,
this is the recommended setting since encoder noise faults should be
cured at machine commissioning. See in the Setup section of the
Installation and Setup manual for your motion controller for more
information on configuring the encoder noise fault action.
An encoder noise fault on an axis can be directly cleared by assigning a
value of 0 to the appropriate Encoder_noise_fault variable using an
Equation block. However, this does not automatically re-enable feedback
or the drive. An encoder noise fault is also cleared when a Feedback On
or Home Axis block is executed or when the Setup Menus in the motion
controller are run. See Setup in the Installation and Setup manual for your
motion controller for more information on the Setup Menus.
Encoder Loss Fault
Encoder_loss_fault is a logical (Boolean) variable which has values of:
• 1 (true) if the encoder signal is lost on the specified axis
CH A:
CH B: