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In order to simulate the function block for the moisture sensor, a global variable list is created. It contained the following variables,

•     sensor

   sensor_read:REAL;

  
  

•     set

   set_point_in_pRh:REAL;

  
  

•    

  alarm_delay:TIME:=T#2S;

  
  

•    

  alarm_dead_zone:REAL:=5;

  
  

•    

  max_pRh:REAL:=100;

• 
  

     

  max_pRh_in_volts:REAL:=10;

  
  

•    

  min_pRh:REAL:=0;

  
  

•    

  min_pRh_in_volts:REAL:=0;

  
  

•    

  alarm_high:BOOL;

     

  
  

• alarm_low:BOOL;

     

• pRh_read:REAL;

A moisture function block was created in the program, which looked like the following,

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Then the visualizer for the simulater was created and looked like this,

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With the two states for too high moisture level, and too low moisture level, as shown below,

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