前言PROFInet 4篇系列文章的前两篇着重介绍了工程模型和运行期模型,本文将重点论及它的开放性以及它对投资的保护。PROFInet采用开放的通信标准TCP/IP和DCOM。然而,在任何时候(不仅仅是引入PROFInet时),总有一些设备它们尚未或今后也不会集成在PROFInet中。其部分原因是由于使用现有的现场总线设备,这些设备属于可迁移的设备;再者事实上,在某些设备上安装PROFInet是不值得为之付出额外开销 Preface The first two articles in the four articles in the PROFInet series focus on the engineering model and the run-time model. This article will focus on its openness and its investment protection. PROFInet uses open communication standards TCP / IP and DCOM. However, at any time, not just when introducing PROFINET, there are always devices that are not yet or will not be integrated in PROFInet in the future. This is due in part to the use of existing fieldbus devices that are part of a migratable device and, in fact, the installation of PROFINET on some devices is not worth the extra effort