Abstract
Industrial Network Protocols are often referred to generically as SCADA and/or fieldbus protocols. SCADA protocols are primarily used for the communication of supervisory systems, whereas fieldbus protocols are used for the communication of industrial, automated control systems (ICS or IACS). Modbus is the oldest and perhaps the most widely deployed industrial control communications protocol. Modbus is an application layer messaging protocol operating at layer 7 of the OSI model. It allows for efficient communications between interconnected assets based on a request/reply methodology. It can be used by extremely simple devices such as sensors or motors to communicate with a more complex computer that can read measurements and perform analysis and control. Another protocol is the Inter Control Center Protocol that is designed for communication between control centers within the energy industry. The ICCP protocol defines communication between two control centers using a client/server model. One control center (the server) contains application data and defined functions. Another control center (the client) issues requests to read from the server, and the server responds. Communications over ICCP occur using a common format in order to ensure interoperability.
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