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