Industrial Communication Systems

19-1

19.1 Introduction

Nowadays, almost any industrial network uses applications based on IP networks [1]. is means that

people

controlling

these

networks

need

to

know

at

least

the

basics

of

quality

of

service

(QoS)

for

IP

net-

works.

Every

device

used

in

an

industrial

network

is

going

to

send

and

receive

IP

packets

but,

depending

on

the

nature

of

the

industrial

application

we

use

in

the

device,

the

way

to

process

the

IP

packets

can

be

decisive

to

the

objectives

we

want

to

get

through

the

device.

e

IP

network

is

the

fundamental

infra-

structure

for

every

industrial

network

so,

although

we

cannot

change

the

details

of

the

IP

implementa-

tion