Motion control instructions Chapter 17
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 445
Axis variables
Axis variables are used to control position, speed, acceleration, and error for a
given motion control axis.
Assigning a variable to an Axis output parameter
In a Function Block Diagram
You can graphically connect the Axis output parameter of a motion control
function block to the AxisIn input parameter of another motion control function
block for convenience. For example, connect MC_POWER Axis output
parameter to MC_HOME AxisIn input parameter. j
In a Ladder Diagram
You cannot assign a variable to the Axis output parameter of a motion control
function block because it is read-only.
Monitoring an AXIS_REF variable
You can monitor an AXIS_REF or a FB_AXIS_REF variable in the software
while connected to the controller, when the motion engine is active, or in the user
application as part of user logic. You can also monitor the AXIS_REF or
FB_AXIS_REF variable remotely through various communication channels.
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