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