Rockwell Automation GMLC Reference Manual - Manual (Page 709)

Publication GMLC-5.2 - November 1999
672 Using AxisLink
It is not possible to directly write a variable or parameter value to another
controller via AxisLink. However, a discrete AxisLink output on this
motion controller can be used to tell another motion controller to request a
value using a Read Remote Value block, thus accomplishing the same
thing.
Handling Faults
If the application program (generated from the GML Commander
diagram and downloaded to the motion controller) is not running, each
motion controller continually attempts to establish all configured virtual
axis and AxisLink I/O links. This guarantees that soon after the last
motion controller powers up, all configured links are working properly.
When the application program is running, the controller does not attempt
to re-establish any failing links—this must be done by the fault handling
routine in the program.