Ethernet; General - WAGO 750-341 Manual

5 ETHERNET

5.1 General

ETHERNET is a technology, which has been proven and established as an
effective means of data transmission in the field of information technology
and office communication. Within a short time ETHERNET has also made a
successful breakthrough in the area of private PC networks throughout the
world.
This technology was developed in 1972 by Dr. Robert M. Metcalfe, David R.
Boggs, Charles Thacker, Butler W. Lampson, and Xerox (Stanford, Ct.).
Standardization (IEEE 802.3) took place in 1983.
ETHERNET predominantly uses coaxial cables or twisted pair cables as a
transmission medium. Connection to ethernet, often already existing in
networks, (LAN, Internet) is easy and the data exchange at a transmission rate
of 10 Mbps or also 100 Mbps is very fast.
ETHERNET has been equipped with higher level communication software in
addition to standard IEEE 802.3, such as TCP/IP (Transmission Control
Protocol / Internet Protocol) to allow communication between different
systems. The TCP/IP protocol stack offers a high degree of reliability for the
transmission of information.
In the ETHERNET TCP/IP fieldbus coupler developed by WAGO, various
application protocols have been implemented on the basis of the TCP/IP stack.
These protocols allow the user to create applications (master applications)
with standardized interfaces and transmit process data via an ETHERNET
interface.
In addition to a series of management and diagnostic protocols, the protocols
MODBUS TCP (UDP) and Ethernet/IP are implemented for control of the
module data.
Information such as diagnostic information is stored in the fieldbus coupler
and can be viewed as HTML pages via a web browser (e.g., Microsoft
Internet-Explorer, Netscape Navigator) being served from the HTTP server in
the coupler.
Furthermore, depending on the requirements of the respective industrial
application, various settings such as selection of protocols (e.g., SNMP, etc),
watchdog timer, internal clock and security configurations can be performed
via the web-based management system. However, you can also load web
pages you have created yourself into the coupler using FTP.
The WAGO ETHERNET TCP/IP fieldbus coupler does not require any
additional master components other than a PC with a network card. The
fieldbus coupler can be easily connected to local or global networks using the
RJ45 connector. Other networking components such as hubs, switches or
repeaters can also be used. However, to establish the greatest amount of
"determinism" a switch is recommended.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
ETHERNET • 97
General