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FM-3 Programming Module Reference Manual

Figure 22: 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 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.

Note

Home must be executed before an Absolute index will run.

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.

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Emerson FM-3 Manual de instalación Pagina 32