Omron SYSMAC FH Series User Manual page 253

Problem
An "Illegal function call" error
sometimes occurs when search
process unit measurement is
executed with the MeasureProc
function
Vision System FH/FZ5 Series
User's Manual (Z340)
Cause
It is possible that no objects
were found in the search
process.
WWW.NNC.IR
Action
An "Illegal function call" error occurs if there are 0
detections in the measurement process of the search
process unit executed with the MeasureProc function.
Use the Try - Catch - End Try function to create a
process that handles the occurrence of 0 detections in
the program.
Reference: Try - Catch - End Try function (p.773)
Basic Knowledge For Macro Customize
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251
Functions