Siemens CP 243-2 Operations Instructions download pdf (Page 5)

5

Control

Cables

Cable assembly

I/O distribution material

I/O distribution assembly

I/O cabling

I/O cabling assembly

Sensors

Previous costs: 100 %

Conventional

26.6 %

Courtesy of: TU München

Prof. Reinhard

Prof. Milberg

AS interface

due to savings in

configuration,

commissioning, and

flexibility of system

expansion

A comparison of the costs between conventional

installation technology and AS-Interface using the

example of a milling machine.

Even as late as 1997, 36% of all ma-

chine and plant failures were caused by

the installation.

The magic word was (and still is) de-

centralisation – first in automation tech-

nology, later in drive and switching tech-

nology, too.

What was meant by that? Well, simply

that the conventional, cost-intensive par-

allel wiring (cable looms) was replaced

by a serial field bus, or a two-wire cable

with which all automation nodes can be

interconnected.

The cost advantages are considerable:

For example, according to a study by

the Technical University of Munich, you

can save more than 25% of the installa-

tion costs if AS-Interface is used on a

milling machine. Even if the costs for

the AS-Interface modules are initially

higher, savings up to 15% to 30% in to-

tal are quite common. The savings are

to be seen in reduced configuration, and

commissioning time, and in achieving

greater flexibility when the system has

to be expanded.

Industrial communication

The structure of a complex automation

system is pretty opaque even for ex-

perts: Numerous control devices are

networked on different data networks

and with different protocols. It has be-

come customary to divide control levels

according to hierarchies. They differ in

their time response, degree of protec-

tion, type and use of data to be trans-

mitted and many other aspects.

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