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6
  Start-up and operation on a Rockwell RSLogix controller (continued)
6.5  Example program
The example program shows retrieval of the sub-routine 
ReadPositions described in the following section in row0. 
It additionally generates two explicit messages to set and 
read an attribute. First access to the Set_Attribute and 
then access to the Get_Attribute is triggered in sequence 
with the Step variable.
BTL7-V50D-…
Configuration Manual