Hover on a highlighted element
to pop up its description (if any).

ALGORITHM COPY IN ST :
   Q := QI;
END_ALGORITHM

The operation of an instance of this function block type for event-triggered detection of the rising and falling edges of the boolean input QI is modeled by the Execution Control Chart (ECC) and algorithm shown above.

See also E_R_TRIG and E_F_TRIG.