====== Standard Function Blocks  ======

Standard function blocks are used in all programming languages (FUPLA, ST).

===== Bistable flip-flop circuits  =====

^Name of the function block^I/O data type^Description         ^
|RS                        |BOOL         |RS flip-flop circuit|
|SR                        |BOOL         |SR flip-flop circuit|

===== Edge detection  =====

^Name of the function block^I/O data type^Description           ^
|R_TRIG                    |BOOL         |Rising edge detection |
|F_TRIG                    |BOOL         |Falling edge detection|

===== Counters =====

^Name of the function block^I/O data type^Description                                     ^
|CTU                       |INT          |Counter counting up to a given value            |
|CTU_DINT                  |DINT         |Counter counting up to a given value            |
|CTU_LINT                  |LINT         |Counter counting up to a given value            |
|CTU_UDINT                 |UDINT        |Counter counting up to a given value            |
|CTU_ULINT                 |ULINT        |Counter counting up to a given value            |
|CTD                       |INT          |Counter counting from a given value down to zero|
|CTD_LINT                  |LINT         |Counter counting from a given value down to zero|
|CTD_UDINT                 |UDINT        |Counter counting from a given value down to zero|
|CTD_ULINT                 |ULINT        |Counter counting from a given value down to zero|
|CTUD                      |INT          |Up and down counter                             |
|CTUD_DINT                 |DINT         |Up and down counter                             |
|CTUD_LINT                 |LINT         |Up and down counter                             |
|CTUD_UDINT                |UDINT        |Up and down counter                             |
|CTUD_ULINT                |ULINT        |Up and down counter                             |