Fault configuration bits, Soft overtravel checking, Hard overtravel checking – Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual User Manual
Page 329: Drive fault checking
Publication 1784-UM003A-EN-P – June 2003
Motion Object Attributes 321
Fault Configuration Bits
Soft Overtravel Checking
When the Soft Overtravel Checking bit is set it enables a periodic test that
monitors the current position of the axis and issues a Positive Overtravel Fault
or Negative Overtravel Fault if ever the axis position travels outside the
configured travel limits. The travel limits are determined by the configured
values for the Maximum Positive Travel and Maximum Negative Travel
attributes. This software overtravel check is not a substitute, but rather a
supplement, for hardware overtravel fault protection which uses hardware
limit switches to directly stop axis motion at the drive and deactivate power to
the system. If the Soft Overtravel Checking bit is clear (default), then no
software overtravel checking is done. Software overtravel checking is only
available for a linear servo axes.
Hard Overtravel Checking
When the Hard Overtravel Checking bit is set it enables a periodic test that
monitors the current state of the positive and negative overtravel limit switch
inputs and issues a Positive Hard Overtravel Fault or Negative Hard
Overtravel Fault if ever the axis position travels activates the limit switch
inputs. If the Hard Overtravel Checking bit is clear (default), then no
overtravel limit switch input checking is done.
Hardware overtravel checking is only available for a linear servo axes.
Drive Fault Checking
The 1784-PM02AE servo module provides a dedicated drive fault input for
each axis. These inputs may be connected to fault outputs on the external drive
(if provided) to notify the servo module of a fault in the drive itself. Set the
Drive Fault Checking bit if you are using the servo module’s drive fault input,
and then specify the drive fault contact configuration of the amplifier’s drive
fault output as described below.
GSV/SSV Access
Attribute Name
Data Type
Values
GSV
Servo Fault Configuration Bits
DINT
Bit Field:
0: Soft Overtravel Checking
1: Drive Fault Checking
2: Drive Fault Normally Closed (S)
3-31: Reserved
Soft Overtravel Checking for Linear
Axis Only; Change to Rotary or
Overtravel Checking requires Home
range checks.