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EZMotion User/Programming Guide
41
Revision A8
www.controltechniques.com
6.3.7
Rotary Minus Index
A Rotary Minus Index is used when Rotary Rollover is active. The Rotary Minus Index is similar to an Absolute Index, but it is
forced to go in the negative direction to get to its programmed position. The programmed position for a Rotary Minus Index
must be within the Rotary Rollover range (Posn < Rotary Rollover). Figure 52 compares a Rotary Minus Index to an Absolute
Index (Rotary Rollover is enabled).
Figure 52:
Rotary Minus Index Profile
6.3.8
Timed Index
A Timed Index is not a specific type of index like the other types listed above. Timed Index is simply an option for the other
types of indexes. Each index type (other than registration indexes) can be configured as a Timed Index.
In many applications, the user knows how far the load must move in a certain period of time. Rather than making the user
calculate an acceleration, velocity, and deceleration so that an index takes the right amount of time, EZMotion allows the user
to enter the distance and the time instead.
In a Timed Index, the user provides the distance and time, and the firmware automatically calculates the accel, velocity, and
decel to finish in the right period of time. Figure 53 shows an example of a Timed Index profile.
Figure 53:
Timed Index Profile
In some cases, an index time is calculated based on other parameters in a user program. To avoid possible machine damage,
the user can specify maximum values for accel, velocity, and decel. Therefore, when EZMotion firmware calculates accel,
velocity, decel, they will never exceed the maximum values specified by the user, In this case, where the calculation is limited
by a maximum value, the index will not finish in the specified time. If this happens, a parameter called Index.ProfileLimited will
activate. It will remain active until cleared by the Index.ResetProfileLimited destination.
Rotary Rollover: 360
o
,
Index Position: 180
o
0
o
90
o
270
o
180
o
0
o
90
o
270
o
180
o
0
o
90
o
270
o
180
o
Rotary Minus
(Forced Negative)
Absolute
(Shortest Path)
Starting Position
Position After Index
Velocity
Index Accel
2 Seconds
Time
Содержание EZMotion
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