Figure 10-2. relative gearing at enable, Figure 10-3. absolute gearing at gear ratio change – National Instruments NI-Motion User Manual

Page 125

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Chapter 10

Electronic Gearing and Camming

© National Instruments Corporation

10-3

NI-Motion User Manual

For example, if you have a gearing ratio of 2:1 (slave:master), the slave
moves 20 counts when the master device moves 10 counts.

Figure 10-2. Relative Gearing at Enable

Absolute gearing behaves similarly to relative gearing in that when gearing
is enabled, the slave axis follows the master axis movement as it is defined
by the gear ratio. The difference between relative and absolute gearing is
that the reference position calculated for the master axis is updated only
when gearing is enabled. This difference is apparent when the gear ratio is
updated on-the-fly.

For example, if the gear ratio is 2:1, the current master position is 1010, the
current slave position is 3020, and the gear ratio is changed to 3:1, the slave
axis jumps from 3020 to 3030 but the master position remains the same.

Figure 10-3. Absolute Gearing at Gear Ratio Change

Master Position

Master Position at Enable

1000

1010

Master Position

After Move

Move

Slave Position

Slave Position at Enable

3000 3020

Slave Position

After Move

Move

Master Position

Master Position
at Enable

1000 1010

Master Position
After Move

Move

Slave Position

Slave Position
at Enable

3000

3030

Slave Position
After Gear Change

Jump

3020

Slave Position
After Move

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