Industrial Data Communications, Fifth Edition
Lawrence Thompson, Timothy Shaw
- English
- ePUB (handyfreundlich)
- Über iOS und Android verfügbar
Industrial Data Communications, Fifth Edition
Lawrence Thompson, Timothy Shaw
Über dieses Buch
This edition will help you gain a solid understanding of legacy and advanced communications systems in automation and control environments as well as the advances in communication technology. You will learn about cybersecurity methods and standards—including ANSI/ISA/IEC 62443—and how to implement communications systems in a safe and secure manner. Read in-depth descriptions of critical subjects including: •Standards including EIA/TIA-232/485, IEEE 802.3, IEEE 802.11, and IEEE 802.15•Protocols such as Modbus, Data Highway Plus, Ethernet, and TCP/IP•SCADA, DCS, and fieldbus systems•Ethernet and router technologies •Wireless communicationAs automation becomes more thoroughly networked with advances in speed, connectivity, and security; this fifth edition of an ISA best seller is still designed to give technical professionals with little or no background in data communications the knowledge they need to succeed. Additionally, even those with nominal knowledge will find information to enhance troubleshooting and to understand both legacy systems and the more advanced systems now being installed throughout automated facilities. As before, the text emphasizes the practical aspects of commonly used systems rather than design criteria. It contains a complete description of the relevant terminology, standards, and protocols including EIA/TIA-232/485, IEEE 802.3, IEEE 802.11, and IEEE 802.15. New material in this edition includes information on updated Ethernet and router technologies; a more detailed description of VPNs; and expanded information on cybersecurity (including ANSI/ISA/IEC 62443). A complete glossary and index allows the book to be used as a handy reference. SCADA, DCS, and fieldbus systems are all explained, as well as operating system considerations from a communications perspective. This is a book for newcomers to automation data communications, as well as a reference for those who are currently working in the field.
Häufig gestellte Fragen
Information
1
Communication Concepts
Elements
Figure 1-1. Forms of Data Communications Organization
Modes |
Figure 1-2. Modes of Data Communications
- The differences between a “mode” and a “circuit” are rather arbitrary. However, the reader needs to be aware that not all channels are hardware, and even though a channel is physically capable of operating in a certain mode, it does not mean that the channel is being utilized in that mode. As an example, a duplex channel could be operated in half-duplex mode.
- In many cases, the literature still uses the term “full-duplex” when referring to duplex mode.
- Simplex or Unidirectional Mode. In this mode, communication occurs only in one direction—never in the opposite direction; in figure 1-2 it is from Station A to Station B. The circuit that provided this mode of operation was originally called simplex (in the 1960’s telephone industry), but this led to confusion with more current telephony terminology. “Unidirectional” is a more appropriate name for this mode of transmission and using the name for this circuit would be much more descriptive; however, old habits (and names) are hard to change, therefore we will use the term simplex in this text (even though we would prefer to use unidirectional) so the reader will not be confused when referencing technical data.
- Half-Duplex Mode. In this mode, communication may travel in either direction, from A to B or from B to A, but not at the same time. Half-duplex communication functions much like meaningful human conversation does, that is, one speaker at a time and one (or more) listener(s).
- Duplex Mode. In duplex mode, communication can travel in both directions simultaneously: from A to B and from B to A at the same time.