Industrial Ethernet について

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Industrial Ethernet ：ウィキペディア英語版

Industrial Ethernet

Industrial Ethernet (IE) refers to the use of standard Ethernet protocols with rugged connectors and extended temperature switches in an industrial environment, for automation or process control. Components used in plant process areas must be designed to work in harsh environments of temperature extremes, humidity, and vibration that exceed the ranges for information technology equipment intended for installation in controlled environments.
The use of fiber Ethernet reduces the problems of electrical noise and provides electrical isolation to prevent equipment damage. Some industrial networks emphasized deterministic delivery of transmitted data, whereas Ethernet used collision detection which made transport time for individual data packets difficult to estimate with increasing network traffic. Typically, industrial use of Ethernet use full-duplex standards and other methods so that collisions do not unacceptably influence transmission times.
==Application environment==
While industrial Ethernet systems use the same protocols as Ethernet applied to office automation, industrial plant use requires consideration of the environment in which the equipment must operate. Plant-floor equipment must tolerate a wider range of temperature, vibration, and electrical noise than equipment installed in dedicated information-technology areas. Since closed-loop process control may rely on an Ethernet link, economic cost of interruptions may be high and availability is therefore an essential criterion. Industrial Ethernet networks must interoperate with both current and legacy systems, and must provide predictable performance and maintainability. In addition to physical compatibility and low-level transport protocols, a practical industrial Ethernet system must also provide interoperability of higher levels of the OSI model. An industrial network must provide security both from intrusions from outside the plant, and from inadvertent or unauthorized use within the plant.〔Perry S. Marshall, John S. Rinaldi "How to Plan, Install and Maintain TCP/IP Ethernet Networks", ISA, 2004 ISBN 1-55617-869-7 pp. 1–4〕
Industrial networks often use network switches to segment a large system into logical sub-networks, divided by address, protocol, or application. Using network switches allows the network to be broken up into many small collision domains. This reduces the risk of a faulty or mis-configured device generating excess network traffic. When an industrial network must connect to an office network or external networks, a firewall system can be inserted to control exchange of data between the networks. To preserve the performance and reliability of the industrial network, general office automation systems are separated from the network used for control or I/O devices.

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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