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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;