<?

ini_set("soap.wsdl_cache_enabled", "0");

$client = new SoapClient(
    'http://192.168.1.20/buh/ws/exchange_2_0_1_6.1cws?wsdl',
    array(
        'login'          => 'Администратор',
        'password'       => '',
        'soap_version'   => SOAP_1_2,
        'cache_wsdl'     => WSDL_CACHE_NONE, //WSDL_CACHE_MEMORY, //, WSDL_CACHE_NONE, WSDL_CACHE_DISK or WSDL_CACHE_BOTH
        'encoding'     => 'utf-8',
        'exceptions'     => 1,
        'trace'          => 0
    )
);

try{
    $res = $client->GetIBData([
        'TableName' => "Справочники.Контрагенты",
    ]);
    var_dump($res);
}

catch (Exception $ex){
    var_dump("Error: ".$ex->getMessage());
}