Wiring Of The Fieldbus Nodes; Direct Connection Of A Node With Crossover Cable; Connection Of A Node By Means Of A Hub With Parallel Cables - WAGO 750 Series Manual

128 • ETHERNET
Network Architecture – Principles and Regulations
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
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.
Fig. 5-3: Connection of a Node by means of a Hub with Parallel cables
An ETHERNET switch is a device that allows all connected devices to
transmit and receive data with each other. The switch can also be viewed as a
"data traffic cop" where the hub "polices" the data coming in and going out of
the individual ports, so the data will only be transmitted to the required node.
WAGO recommends using a switch rather then a hub, this will allow for a
more deterministic architecture.
Attention
The cable length between the node and the hub cannot be longer than 100 m
(328 ft.) without adding signal conditioning systems (i.e., repeaters). Various
possibilities are described in the ETHERNET standard for networks covering
larger distances.
g012906d
g012908d
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP