Abstract
Publisher Summary This chapter describes the features and use of different types of industrial protocols in data communication. The industrial protocols vary from a straightforward American Standard Code for Information Interchange (ASCII) type protocol to the industry standard Modbus protocol. There are a few features contained in an industrial protocol, which can make it useful to an engineer on a plant. These are: —ease of troubleshooting systems, high level of integrity of data transfer, standardization of protocol, and high speed update of parameters. ASCII-based protocols are popular because of their simplicity. However, their main disadvantage is that they are slow and become unwieldy for larger systems with the requirement for multiple nodes on a network that need to communicate with one another. This chapter discusses different features of industrial protocols, along with the use of ASCII-based protocols, read, and write commands of ANSI-X3.28-2.5-A4, and three Modbus structures. This chapter reviews the fairly sophisticated Allen Bradley Data Highway Plus protocol. The OSI model layers used by the Allen Bradley Data Highway Plus protocol are also explained. The chapter also focuses on the software aspects of the protocols.
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