Industrial Communication Systems

26-6 Industrial Communication Systems

(and their specic proles), or Modbus are used at this level. As a soware interface into BMS soware,

OPC[19] hasreached importance. Today, also Web technologies are used, for example, for man-

agement and conguration of DDC stations. However, these are still of limited use for machine-to-

machine communication.

One

fact

that

must

not

be

neglected

is

the

long

life

cycle

of

a

building

and

its

respective

services.

When

faced

with

a

future

extension

or

change

of

the

system,

access

to

all

new

data

points

must

be

preserved.

In

this

case,

only

an

open

system

can

guarantee

that

one

does

not

nd

oneself

tied

to

the

contractor

that

originally

installed

the

system.

With

BACnet

[9,11],

KNX

[6,10,19],

and

Lon ...