System and method of powering and communicating field ethernet device for an instrumentation and control using a single pair of powered ethernet wire

DETAILED DESCRIPTION Referring to FIG.
1, a control system 100 includes a controller 105 that powers and controls a remote field device 110 over a powered Ethernet connection 115.
Thus, the system 100 applies the well-known and well-established Ethernet protocol to an instrumentation and control system.
The powered Ethernet connection 115 may be provided by modifying connections to existing wiring of a system employing a proprietary protocol.
Thus, a powered Ethernet system may be produced by retrofitting an existing system.
Protocols such as the Ethernet protocol are often used to communicate between devices, such as components of a computer network.
Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps.
Ethernet handles simultaneous demands using a technique known as carrier sense multi-access with collision detection ("CSMA/CD").
The Ethernet specification served as the basis for the IEEE 802.
3 communication standard, which specifies the physical and lower software layers.
The IEEE 802.
3 standard controls the implementation of the basic Ethernet hardware technology.
In specific terms, it controls the media access control sublayer and the physical layer functions for a bus-structured local area network that uses CSMA/CD as an access protocol.
One of several adaptations of the Ethernet (IEEE 802.
3) standard for Local Area Networks (LANs) is 10 Base-T.
The 10 Base-T standard (also called Twisted Pair Ethernet) uses a twisted-pair cable with maximum lengths of 100 meters.
The cable is thinner and more flexible than the coaxial cable used for the 10 Base-2 or 10 Base-5 standards.
Cables in the 10 Base-T system connect with RJ-45 connectors.
A star topology is common, with 12 or more computers connected directly to a hub or a concentrator.
The 10 Base-T system operates at 10 Mbps and uses baseband transmission methods.
A networking standard that supports data transfer rates up to 100 Mbps (100 megabits per second), called 100 BASE-T, is based on the older Ethernet standard