PROFINET是基于工业以太网的开放标准。本文将PROFINET中的DHCP协议与DCP协议进行比较,还将ARP协议与DCP进行了比较,从基本内容、报文格式、工作原理等方面进行了分析,并详细阐述了DCP协议是如何实现无需工程配置而更换设备的过程。本文将会帮助自动化工程师加深对PROFINET通信的理解。 PROFINET is an open standard based on Industrial Ethernet. This paper compares the DHCP protocol and DCP protocol in PROFINET, compares ARP protocol with DCP, analyzes the basic content, packet format and working principle, and elaborates on how DCP protocol can realize the project without engineering Configuration and replacement of equipment process. This article will help automation engineers deepen their understanding of PROFINET communications.