Siemens ST PCS 7 manual Optical networks with plastic fiber-optic cables, OBT for Profibus DP

© Siemens AG 2007

Communication

PROFIBUS DP

Optical networks with plastic fiber-optic cables

■Overview

SIMATIC NET plastic/PCF fiber-optic cables can be used to design optical PROFIBUS DP networks inside buildings.

For AS interfacing of ET 200M with exclusively F modules, plastic/PCF fiber-optic cables are an alternative if compliance with safety integrity level SIL 3 is required for the safety-related application. Using plastic/PCF fiber-optic cables, the ET 200M systems are connected to the electrical bus cable of the PROFIBUS DP via optical bus terminals (OBT). The advantage of this configuration is that the isolating module essential for sig- nal decoupling between the IM and the F modules in the case of a direct electrical connection of the ET 200M (only F modules in a rack with IM 153-2) can be omitted.

The following components are available for on-site assembly of the PROFIBUS Plastic Fiber Optic standard cable:

•Simplex connector/polishing set (set with 100 simplex con- nectors and 5 polishing sets)

•Stripping tool set for removing the outer casing and core cas- ing

•You require additional plug adapters for connecting cables with Simplex connectors to devices with integrated FO inter- faces (e.g. IM 153-2 FO).

■Selection and Ordering Data	Order No.
PROFIBUS OBT	6GK1 500-3AA00
Optical bus terminal for connect-
ing a PROFIBUS station or an RS
485 segment without integrated

PROFIBUS DP copper cable

OBT

9

OBT

Safety-related automation system

IM 153-2

ET 200M

with standard I/O modules

IM 153-2 FO

ET 200M

with safety- related

F modules

optical interface to the optical
PROFIBUS; without simplex con-
nector
PROFIBUS Plastic Fiber Optic,	6XV1 821-0AH10
standard cable
Robust round cable with 2 plastic
fiber optic cores, PVC external
sheath and PA internal sheath,
without connectors, for indoor
use, cut-to-length
PROFIBUS Plastic Fiber Optic,	6XV1 821-2AN50	B)
duplex core
Plastic fiber optic cable with
2 cores, PVC sheath, without con-
nectors, for use in environments
with low mechanical stress, 50-m
ring
PROFIBUS Plastic Fiber Optic,	6GK1 901-0FB00-0AA0	B)
Simplex Connector/Polishing
Set
100 simplex connectors and
5 polishing sets for assembling
PROFIBUS plastic fiber optic
cables for the optical PROFIBUS

Plastic Fiber Optic Cable

OBT for PROFIBUS DP

Using the OBT (optical bus terminal) for PROFIBUS, it is possible to connect a PROFIBUS DP station with integrated optical inter- faces to an RS 485 segment or a PROFIBUS DP station without integrated optical interface. Plastic/PCF fiber-optic cables can be used for the optical connection between the PROFIBUS DP station with integrated optical interface and the OBT.

■Design

We particularly recommend the following plastic/PCF standard cables for implementing optical networks in indoor areas:

•PROFIBUS Plastic Fiber Optic standard cable:

-Rugged round cable with purple PVC outer casing and Kev- lar tension-relief elements as well as plastic fibers with rug- ged polyamide inner casing.

-Easy to assemble on site with 2 x 2 Simplex connectors

-Cable lengths up to 50 m

•PROFIBUS PCF Fiber Optic standard cable:

-Preassembled, rugged round cable with purple PVC outer casing and Kevlar tension-relief elements as well as two PCF fibers (Polymer Optical Fiber)

-Cannot be assembled on site

-Cable lengths up to 300 m

Further SIMATIC NET plastic/PCF fiber optic cables can be found in Catalog IK PI, Chapter "PROFIBUS", Section "Optical networks with OBT and integrated interface".

DP
PROFIBUS Plastic Fiber Optic,	6GK1 905-6PA10	B)
Stripping Tool Set
To remove the external or core
sleeve of plastic fiber optic
cables
Connection Adapter	6ES7 195-1BE00-0XA0
Pack of 50, for using simplex con-
nectors with the integrated
FO interfaces (e.g. IM 153-2 FO);
for 25 modules

B) Subject to export regulations: AL: N, ECCN: EAR99H

Note:

For further information on optical PROFIBUS networks as well as compo- nents and accessories, particularly cable material for special applica- tions, refer to Catalog IK PI, Chapter "PROFIBUS", Section "Optical networks with OLM" and "Optical networks with OBT and integral inter- face".

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Siemens ST PCS 7 · November 2007