Rockwell Automation GMLC Reference Manual - Manual (Page 708)

Publication GMLC-5.2 - November 1999
Reading Values via AxisLink 671
For example, suppose this motion controller needs to know the status of
another motion controller (with an address of 2) on AxisLink. Motion
controller 2 has a user variable (User Variable 10) defined that contains a
numeric value indicating its status. The following Read Remote Value
block in the GML Commander diagram for this motion controller, is then
used to read the status variable from controller 2 and store the value in the
local user variable Controller_2_Status. See AxisLink Block in the
Function Blocks chapter of this manual for more information on the Read
Remote value block.