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Epsilon EP-P Drive and FM-3/4 Module Reference Manual
Figure 23: Indexes View
Indexes use acceleration and deceleration ramps which may or may not reach the specified velocity depending on the total
distance and the ramp values. For example, a short move with long acceleration and deceleration ramps may not reach the
target velocity entered.
Indexes cannot be initiated when any other motion (jogging, homing, or program) is in progress. Indexes can be aborted with
the Stop destination found in the Ramps group on the Assignments View.
The FM-3/4 module supports five types of indexes: absolute, incremental, registration, rotary plus and rotary minus.
Absolute vs. Incremental
The difference between absolute and incremental indexes is that absolute indexes move to a specific absolute position and
incremental indexes move the motor a specific distance. The figures and explanations below demonstrate this concept.
Absolute Indexes
Absolute indexes are used in applications where the motor must travel to a specific position, regardless of where the motor
is when the index is initiated.
The device calculates the distance required to move to the specified position from the current position.
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