IAI America XSEL-S - Manual (Page 272)

Chapter 5 Special Functions
5.3.1 Overview
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[2] Incremental Specification
With the incremental specification, the relative positioning of the master-axis and slave-axis
sliders remains fixed while the power is on. (If the sliders were moved while the power was
turned off, synchro movement will begin from the positions after the movement.)
Absolute reset is not performed on an incremental controller. Home return must be executed
at software reset after the power is turned on.
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[3] Absolute Specification (When both the master axis and slave axis are of the absolute
specification)
An absolute reset is performed after the relative positioning of the master axis and slave axis
is determined. Even when the sliders were moved while the power was turned off, the
positions will be corrected automatically when a servo ON (SVON) command is executed.
(The slave slider will move to the displayed coordinate position of the master slider in a
fine-drive mode.)
[Refer to 8.5 How to Absolute Reset on Synchronizing Type]
(Note) For Linear Servo Actuator LSAS Series, the synchronizing function acts as the
incremental type.