Siemens SIMATIC NET PROFIBUS User Manual download pdf (Page 17)

17

PROFIBUS

Network components

Optical Bus Terminal (OBT)

With the OBT (Optical Bus Terminal), a

PROFIBUS-DP station without an inte-

grated optical interface or an existing

RS 485 bus segment is connected to

an optical line. In this way, it opens up

to existing DP units or network seg-

ments the advantages of optical data

transmission in combination with units

that have an integrated optical inter-

face (e.g. ET 200S FO).

The OBT also serves as an "outlet" for

the connection of mobile units (e.g. PG)

without bus interruption.

The PROFIBUS-DP station is con-

nected at an RS 485 interface by a con-

necting cable terminated at both ends,

e.g. 830-1T connecting cable, to the

RS 485 interface of the OBT. The OBT

is integrated into the optical line by two

optical interfaces.

The following optical transmission

media can be connected to the OBT:

· Plastic FO cables

preassembled with 2 × 2 simplex

connectors, max. 50 m

· PCF FO cables

preassembled with 2 × 2 simplex

connectors, max. 300 m.

The OBT offers the following advan-

tages:

· Existing units with electrical inter-

faces and existing bus segments can

be linked to the new optical network

· An economical solution for simple

optical networking

· Save time with simple and fast

assembly of the fiber-optic cable

connector right on site.

PROFIBUS Infrared Link Module

(ILM)

With the Infrared Link Module (ILM),

a wireless PROFIBUS link suitable for

all protocols with a range of up to 15 m

is possible. At a transmission rate of up

to 1.5 Mbit/s, individual stations can be

linked every two segments.

The ILM is used for

· Communication with mobile stations,

e.g. driverless transport systems

(DTS)

· Communication with changing sta-

tions, e.g. stations along conveyor

lines

· Fast system assembly and temporary

configurations, e.g. test setups

· Replacing worn systems, e.g. slip

rings, conductors

An ILM illuminates a circle 4 m in

diameter from a distance of 11 m.

In this way, the ILM makes it possible to

· Install without an adjustment aid

thanks to the wide transmission angle

· Replace worn systems

(slip ring, conductors) and

· When there is a fault change the

electronics quickly and easily thanks

to the permanent wiring.

Figure 33: OBT for PROFIBUS-DP Figure 34: ILM

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