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ALGORITHM LOAD IN ST : (* Load Workpiece *)
  STYLE := S1;
  WKPC := W1;
  PRESENT := TRUE;
END_ALGORITHM

ALGORITHM UNLD IN ST : (* Unload Workpiece *)
  STYLE := S0;
  PRESENT := FALSE;
END_ALGORITHM

An instance of this function block type models the loading and unloading of a workpiece on a mechanism such as a transfer bar or slide. Its operation is defined by the Execution Control Chart (ECC) and algorithms shown above.

See the VSTYLE data type for the semantics of the S0 and S1 inputs.