Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 299)

Acc/Dec Parameters
Chapter 10
10-3
Important: If the selected position loop type is Zero Following Error, you
must use the Rapid Traverse instead of Maximum Contouring Speed.
This calculation results in a ramp expressed in inches per minute per
millisecond. Apply the appropriate conversion factors to convert it into the
units you have selected to enter via AMP. This ramp results in a linear
response throughout the contouring range for accurate contouring moves.
It will also allow the response to curve at speeds above the contouring
range.
Function
Use this parameter in conjunction with Acc/Dec G--codes (G47, 47.1, and
47.9) to select the type of acceleration or deceleration to use when in
positioning (G00) and exact stop modes. It does not affect the type of
acceleration or deceleration used during axis jogging or contouring or
cutting moves (G01, G02, G03).
This is not a per-axis parameter. The Acc/Dec mode selected here is
applied to all axes.
Exponential Acc/Dec -- If exponential Acc/Dec is selected for this
parameter, the axis velocity (during positioning moves) increases or
decreases at an exponential rate determined by the Programmed Delay
Constant parameter. If Exponential is selected, then Exponential
Acc/Dec will be performed during positioning, regardless of the active
Acc/Dec mode (G47.x).
10.2
Positioning ACC/DEC Mode