Time scheduler, integer

T19_INT_SCHEDULER

PROGRAM TEST_T19
   VAR 
        FB : LIB.HVAC.V1_0.T19_INT_SCHEDULER := (TPGVALUE := [(STARTTIME := 0, STATE := 0),
     (STARTTIME := 1630, STATE := 7),
        (STARTTIME := 1750, STATE := 0),
        (STARTTIME := 3070, STATE := 7),
        (STARTTIME := 3190, STATE := 0),
        (STARTTIME := 65535, STATE := 0)], 
     EXCEPTIONS := [(STARTTIME := 1000, ENDTIME := 2000, STATE := 0)]);
      DT1:DT;
     INT1:UINT;
  END_VAR
 DT1:=getlocaltime();
    FB(CURRENTTIME:=DT1, OUT=> INT1);
END_PROGRAM

LIB\HVAC

V1.0

Time scheduler is a source of an integer variable which value changes according to a weekly schedule with maximum 42 events (changes of state). Exception events (exceptions) defined by date, time, and state can be inserted.

The time scheduler compares current date and time with the definition table and sends the actual state to the output. The output is a integer value. The possible scheduler states are defined The time scheduler can be edited from IDE or HMI - LCD display, web interface, touchscreen, SCADA or another client).

Time scheduler is used to specify variable setpoints in time directly. (Use T17_BOOLEAN_SCHEDULER for boolean (on/off) output, and T18_REAL_SCHEDULER for direct outout of analogue setpoints.) At the image below, T19 is used to switch between Off / Stage 1 / Stage 2 / CO₂ control modes.  In the CO₂  mode, the fan stages are changed according to the  CO₂ concentration in the room. 

In the editor there is a morning purge at 7:00 with Stage 2, Stage 1 is active in the morning and in the evening, while in the daytime the CO₂ control is active.