def createc_fbz(stm):
    """   
    Function returning Createc channel feedback z value

    Parameters
    ----------
    stm : createc.CreatecWin32
        Createc instance
    Returns
    -------
    value : str

    """
    # from createc.Createc_pyCOM import CreatecWin32
    # stm = CreatecWin32()
    return stm.client.getdacvalfb()