Analysis of ISO on TCP, UDP, PROFINET IO, and S7 Communication Protocols

Abstract

This article is based on an analysis of communication protocols used in industrial solutions. It presents a brief description of Ethernet communication protocols, specifically ISO on TCP (described as a mechanism that enables ISO applications to be ported to the TCP/IP network), UDP (User Datagram Protocol), Profinet IO, and S7-connection. Based on these characteristics, four industrial network models were configured, and individual protocols were implemented in the controller. The publication presents several Ethernet protocols that were configured on Siemens S7-1200 family controllers in the TIA Portal environment. The purpose of this publication is to present and analyse commonly used industrial Ethernet networks. The possibility of data exchange between individual controllers has been verified, with relevant instructions provided. Detailed differences between the industrial networks in question have been highlighted. Profinet IO is the most versatile network in terms of control process selection, integration with other networks, and ease of configuration. On the other hand, the cheapest solution is to choose the S7-connection protocol. In addition, the authors presented the types of instructions introduced for bit and byte exchange, such as TCON, TSEND, PUT, and TDISCON. Chapter 4 provides a descriptive analysis of the advantages and disadvantages of the communication protocols discussed, as well as a table summarising the topology and integration of each protocol. There are many different protocols to choose from in industrial automation. It should be noted that the selection of individual devices depends not only on data transfer speed but also on hardware and software configuration. After analysis, the authors pointed out that the choice is often driven by selecting an easier data exchange application.