Chapter 17 Motion control instructions
478 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Arguments
Parameter Parameter type Data type Description
AxisIn Input FB_AXIS_REF See also FB_AXIS_REF data type on page 434.
Enable Input BOOL Get the value of the parameter continuously while enabled.
Axis Output FB_AXIS_REF Axis output is read-only in LD programs.
See also FB_AXIS_REF data type on page 434.
Valid Output BOOL When TRUE, indicates the function block is active and new output values are
expected.
Busy Output BOOL When TRUE, the function block is not finished.
Error Output BOOL When TRUE, an error was detected.
ErrorID Output UNIT Error identification.
See also Motion control function block error IDs on page 440.
Position Output REAL The value of the actual absolute position for feedback motion Axis. (in axis’
unit [u])
MC_ReadActualPosition function block examples
Function Block Diagram (FBD)