说明：  随着互联网络的发展，越来越多的用户（特别是OEM的用户）希望能够通过互联网络对所售出的产品进行诊断和维护，这样可以减少维护工程师到现场的时间和费用，不仅节约大量的人力和物力的成本，同时也能为客户提供更为快捷的服务，减少客户的损失，这样，远程诊断和服务是客户迫切需要解决的问题。 这里我们提出几种适用于SIEMENS PLC远程访问的方案供大家讨论。
(With the development of the Internet, more and more users (especially the OEM customers) want to sell through the Internet on the diagnosis and maintenance of the products, thus reducing maintenance engineers to the scene of the time and cost savings not only a large number of manpower and material costs, but also can provide more efficient service to customers, reduce customer losses, so that the remote diagnostic and treatment services is an urgent need to address the problems our customers. Here we propose several applicable SIEMENS PLC remote access program for discussion.)