Geoffrey McPherson (* detect a value change for REAL data type*) Changing_value1_REAL:= Monitored_InputVar_REAL; Changing_value2_REAL:= Changing_value1_REAL - Changing_value3_REAL; Changing_value3_REAL:= Monitored_InputVar_REAL; (* detect a value change for INT data type*) Changing_value1_INT:= Monitored_InputVar_INT; Changing_value2_INT:= Changing_value1_INT - Changing_value3_INT; Changing_value3_INT:= Monitored_InputVar_INT; if (Changing_value2_REAL <>0.0)or(Changing_value2_INT <>0) then ValueChangeDetected := 1; else ValueChangeDetected := 0; end_if;