AMCI SV160E2, User Manual, Page: 35 / 120

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SV160E2 User Manual
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OTION
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ONTROL
35
Axis Follower Moves
On controllers that support motion axis programming, such as the Rockwell Automation ControlLogix plat-
forms, the SV160E2 can be tied to the motion axis, with the host controller periodically sending position and
velocity data to the unit as part of the axis update. The loop is closed by the SV160E2 by controlling the posi-
tion and velocity of the motor. Both linear and circular axes are supported.
When compared with Linear Axis Follower Moves, Circular Axis Follower Moves have one additional
parameter. This parameter is often called the “Position Unwind” value, and it defines the point at which the
position rolls over and returns to zero. On the SV160E2 units, this parameter has a range of 1,024 to
1,073,741,824.
When using the SV160E2 as an axis follower, it is best to run the virtual axis as a high priority
event driven periodic task.
Be aware of the potential for position overflow in systems that use linear axis follower. One
example is a conveyor that always rotates in one direction. If the position value overflows, it
will switch from the maximum positive value to the maximum negative value, or vice versa,
and unpredictable motion may occur.
A sample program that demonstrates virtual axis programming on the ControlLogix platform is available on
the AMCI website at
https://www.amci.com/industrial-automation-support/sample-programs/ . If you are
using a different host controller that supports motion axis programming, feel free to contact AMCI technical
support for assistance in programming your controller.