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 output value is recalculated at 30-second intervals.

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.