Industrial Communication Systems

40-6 Industrial Communication Systems

changed to meet future requirements) and modular eld devices (for dierent applications, the degree of

expansion

ca

n

be cu

stomized

to th

e

us

e

ca

se

wh

en

co

nguring

th

e

sy

stem).

All

eld

devices

are

described

in

terms

of

their

available

technical

and

functional

properties

in

a

gen-

eral

station

description

(GSD)

le

to

be

created

by

the

eld

device

developer.

It

contains,

among

other

things,

a

representation

of

the

device

model

that

is

reproduced

by

the

device

access

point

(DAP)

and

the

dened

modules

for

a

particular

device

family.

A

DAP

is,

so

to

speak,

the

bus

interface

(access

point

for

communication)

to

the

Ethernet

interface

and

the

processing

program.

It

is

dened

along

with

its

properties

and

ava ...