Incremental Index; Registration Index - Emerson SM-EZMotion Module P/N 400361-00 User Manual

position. After completing an Absolute Index, the motor will
always be in the same position regardless of the starting
position of the motor. The direction that the motor moves
during an Absolute Index is dependant upon its position
when the index is initiated.
If an Absolute Index is initiated a second time, just after
completing the first index the motor will not move because
it is already at its specified absolute position.
Figures 41 and 42 show examples of an Absolute Index
profile.
-4 -2 -1 0
Starting Position: -2 Revs
Index Position: 2 Revs
Figure 41: Absolute Index Profile (Example 1)
-4 -2 -1 0
Starting Position: 3 Revs
Index Position: 2 Revs
Figure 42: Absolute Index Profile (Example 2)
Note
If Rotary Rollover is active, an Absolute Index will
take the shortest path to the specified index position.

5.4.2 Incremental Index

An Incremental Index is used to make the motor travel a
specified distance each time the index is initiated. The final
position after the Index is completed is entirely dependant
on the starting position before the Index was initiated.
If an Incremental Index is initiated a second time, it will
move the same distance each time.
Figures 43 and 44 show examples of an Incremental Index
profile.
1 2 3
Starting Position: 2 Revs
Index Distance: 4 Revs
Figure 43: Incremental Index Profile
1 2 4
Starting Position: 2 Revs
Index Distance: 3 Revs
Figure 44: Incremental Index - Repeated 3 Times
26
1 2
1 2
4 5 6 7
6 8 10 12
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5.4.3 Registration Index

A Registration Index functions much the same as a Home
profile. The index runs at a specified velocity until a
registration signal activates. Once the signal activates, the
index either beings to decelerate immediately, or it
continues at velocity for a specified offset distance.
5.4.3.1 Registration to Sensor
In a Registration Index with Sensor defined as the
registration signal, the index travels at velocity until an
external sensor or switch activates. The sensor or switch
must be wired to a digital input on the SM-EZMotion
module, SP drive, or SM-IO Plus module. To get the
Position
4
(Revs)
highest accuracy for the Registration to Sensor, an
SM-EZMotion module digital input must be used to take
advantage of the high-speed capture capability. Three
Figures below show examples of a Registration Index to
Sensor using different Offset values.
Velocity
Position
4
(Revs)
Index Accel
Index Initiate
Registration Sensor
Figure 45:
Velocity
Index Accel
Position
8
(Revs)
Index Initiate
Registration Sensor
Position
14
(Revs)
Figure 46:
Index Velocity
Index Registration Offset
Registration to Sensor Profile (Offset > 0)
Index Velocity
Index Decel
Two areas are equal so motor
ends at exact registration position
Index Accel
Index Velocity
Registration to Sensor Profile (Offset = 0)
SM-EZMotion Module User Guide
Index Decel
Time
Time
Index
Decel