S5-95U, SINEC L2 System Description
1 System Description
In this chapter, you will learn the following:
• The applications that the SINEC L2 network is suited for
• The performance capabilities that the SINEC L2 network is equipped with
• The operation principle of the SINEC L2 network
• The explanation of important basic terminology and parameters
• The types of data transmission that are possible and which criteria you use to select them
• The transmission physics that can be used
1.1 Communications in Industry
In today’s modern production control systems, the installations for process automation operate in an
information network that can be organized into several hierarchy levels, as illustrated in Figure 1-1.
Figure 1-1. Hierarchy Levels in the Computer-Integrated Automation Network
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mainframe e.g. SNI MX, DEC VAX
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The following sections explain the different tasks of each of the hierarchy levels.
EWA 4NEB 812 6112-02
1-1
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