Technical data

112 • ETHERNET
Network Architecture – Principles and Regulations
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
The media types are shown with their IEEE shorthand identifiers. The IEEE
identifiers include three pieces of information.
The first item, for example, “10”, stands for the media.
The third part of the identifier provides a rough indication of segment type or
length. For thick coaxial cable, the “5” indicates a 500 meter maximum length
allowed for individual thick coaxial segments. For thin coaxial cable, the “2”
is rounded up from the 185 meter maximum length for individual thin coaxial
segments. The “T” and “F” stand for ‘twisted pair’ and ‘fiber optic’, and
simply indicate the cable type.
10Base-T, 100BaseTX
Either the 10BaseT standard or 100BaseTX can be used for the WAGO
ETHERNET fieldbus node.
The network architecture is very easy and inexpensive to assemble with S-
UTP cable as transmission medium or with cables of STP type.
Both types of cable can be obtained from any computer dealer.
S-UTP cable (screened unshielded twisted pair) is single-shielded cable of
Category 5 with overall shield surrounding all twisted unshielded conductor
pairs and an impedance of 100 ohm.
STP cable (shielded twisted pair) is cable of Category 5 with stranded and
individually shielded conductor pairs; no overall shield is provided.
Wiring of the fieldbus nodes
A crossover cable is required for direct connection of a fieldbus node to the
network card of the PC.
Fig. 5-2: Direct Connection of a Node with Crossover Cable g012906d
If several fieldbus nodes are to be connected to a network card, the fieldbus
nodes can be connected via an ETHERNET switch or hub with straight
through/parallel cables.