Siemens SIMATIC NET PROFIBUS User Manual download pdf (Page 3)

3

PROFIBUS topologies

Mixed network and wireless link

Mixed network

Mixed structures combining electrical

and optical networks are possible.

The transition between the two media is

provided by the OLM.

In the communication between the sta-

tions on the bus, there is no difference

between two-wire and fiber-optic tech-

nology.

Up to 127 stations may be connected

to a PROFIBUS network.

The optical transmission method offers

the following advantages:

· Plastic or glass fiber-optic cables are

insensitive to electromagnetic radia-

tion and make the EMC measures

necessary in electrical networks su-

perfluous

· In outdoor installations, there is no

need for lightning protection mea-

sures

· Fiber-optic cables make floating

connections between the system

components. This means that there is

no need for expensive equipotential

bonding measures.

· Fiber-optic cables can cover long

distances between stations.

Wireless link with ILM

The PROFIBUS Infrared Link Module

(ILM) can be used for the wireless

connection of individual or several

PROFIBUS slaves or slave segments.

At a maximum transmission rate of

1.5 Mbit/s and a maximum range of

15 m, it is possible to communicate

with moving components, e.g. with

driverless transport systems (DTS) or

substitute for worn systems (slip rings,

conductors).

Figure 4: Typical configuration combining electrical and optical PROFIBUS

Figure 5: Linking to mobile stations

OLM OLM

OP 17

OLM OLM

ET 200S

S7/M7-300

Glass FO cable

Bus cable

for PROFIBUS

ET 200M ET 200S

ET 200X

OLM

Slave e.g.

ET 200X

Slave e.g.

ET 200S

Slave e.g. ET 200B

Master e.g. S7-300

ILM

ILM

ILM

1 2 3 4 5 6 7 8 ... 23 24

Comments to this Manuals

No comments