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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_read:REAL;
  •     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;
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Industrielle styresystemer - NTNU Ålesund - Automasjon