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6.5.1  Position data query in the program
The example shows the query of position data, 
programmed in structured text. It is important that the 
limits of the array are not exceeded in the loop and that the 
offset is considered for Data Valid, Cycle Counter and 
System Time ns.
6
  Start-up and operation on a Rockwell RSLogix controller (continued)
BTL7-V50D-…
Configuration Manual