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96 •
LON
4.3 Network architecture – Principles and Regulations
A locally operating network is designed on the basis of an intelligent fieldbus
node, one DC 24 V power supply unit and a PC with an installed Network
Management Tool Software.
A XLON
PC's parallel port as an interface to the bus. A connection cable is included in
the XLON
Every fieldbus node consists of a fieldbus coupler/controller at the front end, a
number of I/O modules and an end module which is placed at the other end.
The connection between the I/O modules and the coupler/controller is made
automatically when snapped onto the DIN rail.
The internal bus includes the internal communication between them.
Physical 62 digital I/O modules can be connected to one LON fieldbus cou-
pler/controller.
Sensors and actuators are connected on the fieldside to the digital or analog
I/O modules. They are intended to ensure the coupling of the digital, analog or
serial sensors and evaluate their signals.
Fig. 4-1. Connection principle of a fieldbus node for a network architecture
In the initialization phase the fieldbus coupler/controller determines the physi-
cal structure of the node and creates a process image from this with all inputs
and outputs. This could involve a mixed arrangement of analog (word by word
data exchange) and digital (byte by byte data exchange) modules.
The fieldbus communication between network management application and
fieldbus-coupler/controller takes place via network variables.
The coupler is equipped with a special micro-controller for signal processing,
the so-called Neuron chip. Depending on the application for signal process-
ing, this Neuron chip contains an individual program written in the program-
ming language Neuron C.
®
®
Lon-Talk
Adapter (Item no.: 759-344) can be fixed on the
DONGLE
®
delivery.
DONGLE
G912301e
®
L
W
ON
ORKS
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