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$i = 0;
$iblockId = 8;
//$elId = 6463;
$propCode = 'CODE';
$arParams = array(
    "replace_space"=>"-",
    "replace_other"=>"-"
);
$el = new CIBlockElement;

if(\Bitrix\Main\Loader::includeModule('iblock')){
    $arOrder = array("SORT" => "ASC");
    $arFilter = array(
        'IBLOCK_ID' => $iblockId,
        'ACTIVE'   => 'Y',
        //'ID'      => $elId,
    );

    $arSelect = array(
        'ID',
        'NAME',
        'CODE',
        'IBLOCK_ID'        
    );

    $dbRes = CIBlockElement::GetList($arOrder, $arFilter, false, false, $arSelect);

    while($arOb = $dbRes->Fetch()){        
        if($i >= 10) sleep(1);
        $name = $arOb['NAME'];
        $code = $arOb['CODE'];
        $elId = $arOb['ID'];
        
        if(empty($code) && !empty($name)){
            $translit = Cutil::translit($name,"ru",$arParams);
            $arProp = array(
                'IBLOCK_ID' => $iblockId,
                $propCode   => $translit
            
            );
            if($el->Update($elId,$arProp)) {
                echo $i++.' = Y<br>';
            }else{
                $arError[] = $el->LAST_ERROR;
            }            
        }
                
    }
    if(!empty($arError)){
        dump($arError);
    }    
}