Allen-Bradley ControlLogix Reference Manual

Chapter 4
CIP Axis Attributes
444 Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
the drive also sets the Brake Malfunction start inhibit. This prevents the drive
from restarting after the load has been safely lowered to the floor.
Auto Sag Slip Increment
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - DE Set/SSV REAL 0 0
Position Units
This attribute sets the incremental amount of brake slip allowed by the drive's
optional Auto Sag function before restoring holding torque. When brake slip
occurs, the drive allows this amount of displacement and then automatically
enables the power structure and applies holding torque to arrest the slip. The drive
then ramps the motor torque to zero based on the Brake Prove Ramp Time while
checking for slip. Should brake slip continue, the cycle repeats. In crane and lift
applications, this repeating "Auto Sag" cycle is designed to lower the load in a
controlled series of Auto Sag Slip Increments until the load reaches the ground.
Auto Sag Time Limit
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - DE Set/SSV REAL 0.25 0
Seconds
This attribute sets the time limit over which the drive checks for brake slip as
performed by the Auto Sag function before restoring holding torque. When brake
slip occurs, the drive allows this amount of time before automatically enabling the
power structure and applying holding torque. The drive then ramps the motor
torque to zero based on the Brake Prove Ramp Time while checking for slip.
Generally, in a brake slip situation, the Auto Sag Slip Time Limit expires when the
load reaches the ground after one or more Auto Sag Slip Increment cycles. With
no further slip occurring while the motor torque is ramping to zero, the Auto Sag
feature transitions the axis to the Major Faulted state and the drive power
structure is disabled.
The optional Auto Sag Slip Time Limit attribute is not required by the Auto Sag
feature. If not supported, a vendor specific value for the Auto Sag Slip Time is
applied, typically 0.25 seconds.
Auto Sag Start
Usage Access Data
Type
Default Min Max Semantics of Values
Optional - DE Set/SSV USINT 0 - - Enumeration:
0 = Disabled
1 = Enabled
2-255 = (reserved)

Allen-Bradley ControlLogix Specifications

General

Brand	Allen-Bradley
Model	ControlLogix
Category	Industrial Electrical
Language	English