Rockwell Automation GMLC Reference Manual - Manual (Page 575)

Publication GMLC-5.2 - November 1999
538 Fault Variables
This fault condition does not appear as an independent fault variable in
either the Tag Window or the Expression Builder.
Bad Arc (Circular Interpolation)
This fault (Runtime_fault = 27) occurs when an Interpolate Axes block
executes in either of two instances.
First, with Intermediate Arc selected, either:
• the current position, the end point and the intermediate point are all
on the same line, or
• two of these points are identical.
Second, with Radius Arc selected, the arc endpoint does not lie on the
circle (i.e. within 0.5%) described by the starting point and center point.
To correct the problem:
Check your calculations to insure that no two points are the same and no
two points are on the same line (for Intermediate Arcs), and that the
endpoint lies on the described circle (for Radius Arcs).
See the online help topic Radius Arc – Bad Arcs for more information.
This fault condition does not appear as an independent fault variable in
either the Tag Window or the Expression Builder.
Attempt to Access Unknown AxisLink Device
This fault (Runtime_fault = 25) indicates that communications between
two AxisLinked controllers has failed, because the local controller is
either:
• not receiving data from the intended remote controller, or
• receiving data from an unintended remote controller.
This occurs when the local controller requests flag information from
another AxisLink node, which information has not been updated and is no
longer valid.