Installation guide

Keyword Reference Guide

MN1270 02.2002 135

Auxiliary encoder channel Value to write to VELENCODER

0 (NextMove BX and NextMove PCI) -1

1 (NextMove PCI with expansion card) -2

To turn off dual encoder feedback, the velocity encoder must be set to the same encoder as is being

used for position feedback. This can be achieved by reading the

AXISCHANNEL keyword.

For example, turn off dual encoder feedback on axis 0.

VELENCODER.0 = AXISCHANNEL.0

Example 1

On NextMove PCI, axis 2 controls a table through a leadscrew. There are two encoders available, one

attached to the table and another to the motor shaft. Axes 0, 1 and 3 are also in use. To set this system

up for dual encoder feedback, the position feedback encoder (on the table) should be attached to

encoder input 2. The velocity encoder (on the motor) should be attached to the auxiliary encoder input.

The

VELENCODER keyword is used to specify the location of the velocity feedback.

VELENCODER.2 = -1

Example 2

On NextMove BX, axis 0 provides position feedback and axis 1 provides velocity feedback. The

VELENCODER keyword used to specify that axis 0 is using dual encoder feedback.

VELENCODER.0 = 1