FUNCTION_BLOCK fb_test_use_skobki
  VAR_INPUT
    IN : BYTE;
  END_VAR
  VAR_OUTPUT
    OUT : BYTE;
  END_VAR

  {{
    extern uint8_t test_func(uint8_t a);
    SetFbVar(OUT, test_func(GetFbVar(IN)));
  }}
END_FUNCTION_BLOCK

PROGRAM program_test_skobki
  VAR
    gettr : BYTE := 1;
    settr : BYTE := 2;
    fb_test_impl : fb_test_use_skobki;
    error_line_23_26 : DINT;
  END_VAR

  error_line_23_26 := d;
  fb_test_impl(
       IN := gettr(*BYTE*),
       OUT => settr(*BYTE*));
END_PROGRAM


CONFIGURATION config

  RESOURCE resource1 ON PLC
    TASK task_test(INTERVAL := T#20ms,PRIORITY := 0);
    PROGRAM instance_task_test WITH task_test : program_test_skobki;
  END_RESOURCE
END_CONFIGURATION