An instance of this Function Block type sequences a set of
four boolean outputs in an order determined by the MODE
input. Successive steps in the output sequence are triggered by events
at the REQ input.
The INIT, COUNT_UP
and COUNT_DOWN algorithms are written in the ST
(Structured Text) language, and the FLASH_ALL, CHASE_UP
and CHASE_DOWN algorithms are written in the LD (Ladder
Enter data for the MODE input variable.
Exercise the FB by clicking on the event inputs.