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RS 485/PROFIBUSDescription

The RS485/PROFIBUS LWL optical waveguide cou-pler reroutes the PROFIBUS from copper conduc-tors to optical waveguides. The LWL coupler is apassive bus participant. Each electrical bus brunchopens a new 485 segment for 32 PROFIBUS par-ticipants. Additional repeater are not needed. Inexplosive plant areas, the LWL coupler allows the

bridging of great distance with PROFIBUS withoutnoise interference. The LWL coupler is installed inthe hazardous area. The electronics for the signalconversion is accom-modated in the flameproofMODEX enclosure. Transmitter and receiver for theoptical waveguide are housed in the mounting foot.The electronic systems intrinsically safe control oftransmitter and receiver guarantees that none ofthem over-heats and the transmission rates do notgo beyond maximum value limits.

Two versions are available:

1 channel for point-to-point connections

2 channels for an optically redundant ring

These possibilities allow you to realize all your tasksin the Ex-zone 1 using glass material, from thesimple optical waveguide to the redundant opticalring.

Electrical data

Supply voltageDC 20 V to DC 30 V

Power consumption dissipationP

V= 0.85 W / Optical waveguide coupler

PV

= 1.95 W / Ring-coupler

Galvanic isolationBus // power supply // optical waveguide

Bus input / outputRS 485 with screw clamping terminals

LWL input / outputF-SMA LWL-plug-in connectors

Wavelength820 nm/glass

Display

Operation LED greenAct ive bus LED yel low

Distance1400 m; 50.0 m fibre/glass2600 m; 62.5 m fibre/glass

Guidlines/norms/certificationsEC-EMC guidline 89/336/EECNAMUR recommendation AK 21 EMCEC low voltage directive 73/23/EECEx directive 94/9/EC

Explosion protectionEx protection type

II 2 G EEx de [ib] IICI M 2 EEx de [ib] I

CertificationModule PTB 97 ATEX 1068 UEnclosure TV 99 ATEX 1404 X

Safety dataU

m= 253 V

(for further data see certificate of conformity)

Technical data

ConstuctionFlameproof, clip-on enclosure to TS 35

Enclosure material

High-quality thermoplasticProtection class

Module IP66Terminals IP20Terminals with cover IP30

Terminals2.5 mm2, stranded

Labellingfront panel label for markings

DisplayLEDs on front panel

Storage temperature- 40 C to + 60 C

Ambient temperature- 25 C to + 60 C

Weight0.600 kg

Features

Bridging of great distances

Noise-immune signal transmission

for hazardous areas EMC according to EN50081/-82

Galvanic isolation

BI921S/BI923SLWL coupler

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BI921S/BI923S LWL coupler

Terminal assignment BI921S(BARTEC 07-7311-97WP/6000)

Terminal assignment BI923S(BARTEC 07-7311-97WP/5000)

Example for point-to-point connection

Example optical ring

Dimensions/mounting positions

Modul width: 75 mm

3/23

Order no.

BI921S 1 channel glass / F-SMA LWL-plug-in connectorsBI923S 2 channels glass / ring-coupler / F-SMA LWL-plug-in connectors

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RS 485 fiber optic coupler RS 485 fiber optic coupler RS 485 fiber optic coupler