Rockwell Automation GMLC Reference Manual - Manual (Page 737)

Publication GMLC-5.2 - November 1999
700 Using the RIO Adapter Option
Axis Fault
The axis fault output for each axis (SLC or PLC inputs 4 – 7) is set
whenever an axis fault occurs
(Axis_fault > 0). The next table shows
the axis faults that trigger an axis fault output, and the corresponding
message that appears in the Terminal Window (or Runtime Display, if
enabled).
If no axis faults have occurred (Axis_fault = 0), the fault output for the
axis is cleared and the message “No Fault” appears in the Terminal
Window (or Runtime Display, if enabled.)
Specifically, the axis fault output for an axis is set whenever the
corresponding Axis_fault variable in GML Commander has a value
greater than 0, and cleared whenever it has a value of 0. See the Status
Variables chapter of this manual for more information on Axis_fault.
To determine which fault is active when one of the axis fault bits is set,
the PLC should issue a block transfer read of the appropriate axis fault
status variable in the motion controller. See Using Block Transfers in this
chapter for more information.
Axis Faults
Description
On Watch & Axis System
Variable Display Runtime
Display
Drive Fault Drive_fault DRV FLT
Position Error Tolerance Exceeded Position_error_fault ERR FLT
Hardware Overtravel Fault Hardware_overtravel_fault HRD LIM
Software Travel Limits Exceeded Software_overtravel_fault SFT LIM
Encoder Noise Fault Encoder_noise_fault ENC FLT
Encoder Loss Fault Encoder_loss_fault ENC FLT