FB_HVACPersistent_Real
VAR_INPUT
bSetDefault : BOOL;
rVar_Default : REAL;
bSetDefault: if the variable is TRUE, the value of the input variable rVar_Default is adopted.
rVar_Default: default value defined by the user. The variable is of the data type REAL.
VAR_IN_OUT
rVar : REAL;
rVar: variable that is programmed fail-safe by the user.