164
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Fieldbus Communication
ETHERNET
WAGO-I/O-SYSTEM
750
BACnet/IP Controller
The WAGO ETHERNET TCP/IP fieldbus node does not require any addi-
tional master components other than a PC with a network card. So, the field-
bus node can be easily connected to local or global networks using the field-
bus connection. Other networking components such as hubs, switches or re-
peaters can also be used. However, to establish the greatest amount of “deter-
minism” a switch is recommended.
The use of ETHERNET as a fieldbus allows continuous data transmission be-
tween the plant floor and the office. Connection of the ETHERNET TCP/IP
fieldbus node to the Internet even enables industrial processing data for all
types of applications to be called up world-wide. This makes site independent
monitoring, visualization, remote maintenance and control of processes possi-
ble.
4.1.2 Network Architecture – Principles and Regulations
A simple ETHERNET network is designed on the basis of one PC with a net-
work interface card (NI), one crossover connection cable (if necessary), one
ETHERNET fieldbus node and one 24 V DC power supply for the cou-
pler/controller voltage source.
Each fieldbus node consists of a (programmable) fieldbus coupler or control-
ler and a number of needed I/O modules.
Sensors and actuators are connected to the digital or analog I/O modules on
the field side. These are used for process signal acquisition or signal output to
the process, respectively.
Fig. 4-1. Connection Example and Principle of a Fieldbus Node for a Network Architecture
1Netwerkknotene
Fieldbus communication between master application and (programmable)
fieldbus coupler or controller takes place using the implemented fieldbus spe-
cific application protocol, e. g. MODBUS TCP (UDP), EtherNet/IP, BACnet,
KNXNET/IP, PROFINET, Powerlink, SERCOS III or others.
