Abstract
The chapter describes International Electrotechnical Commission (IEC) 60870-5 as a collection of standards produced by IEC to provide an open standard for the transmission of supervisory control and data acquisition (SCADA) telemetry control and information. The standard provides a detailed functional description for telecontrol equipment and systems for controlling geographically widespread processes, such as SCADA systems. The standard is intended for application in electrical industries and has data objects that are specifically intended for such applications; however, it is not limited to such applications as it has data objects that are applicable to general SCADA applications in any industry. IEC 60870-5-101 or T101 supports point-to-point and multidrop communication links carrying bit-serial low-bandwidth data communications. It provides the choice of using balanced or unbalanced communication at the link level. With unbalanced communication, only the master can initiate communications by transmitting primary frames. The message structure under IEC 60870-5-101 is formed by a data link layer frame carrying link address and control information, a flag to indicate if Class 1 data is available, and optional application data. Each frame can carry a maximum of one application service data unit.
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