RS485/PROFIBUS LWL Ring-coupler



  • Bridging of great distances
  • Noice-immune signal transmission
  • Galvanic isolation


Ex II 2(1)G Ex db e [ib] IIC Gb
Ex I M2 Ex db e [ib] I Mb
Ex db e [ib] IIC Gb
Ex db e [ib] I Mb
Class I Zone 1 IIC
A/Ex d e [ib] IIC Gb
Fitting (17-1923-1122/0000):
Ex II (2) G / II (2) D
[Ex ib Gb] IIC
[Ex ib Db] IIIC
Optical waveguide, Transmitter (17-2114-0002):
Ex II 2 G / II 2 D
Ex ib op is IIC T4 Gb
Ex ib IIIC TX* °C Db
Optical waveguide, Receiver (17-2114-0003):
Ex II 2 G / II 2 D
Ex ib IIC T4 Gb
Ex ib IIIC TX* °C Db


Directive 2004/108/EG
Directive 94/9/EG

Ambient temperature

-25 °C to +60 °C at T4


PTB 97 ATEX 1068 U
IECEx PTB 11.0083U
TÜV 99 ATEX 1404 X (Module)
IECEx TUN 12.0024X
CSA 2484303
TC RU C-DE.BH02.B.00005
TÜV 13.1683 U
UL-BR 14.0356X


The RS485/PROFIBUS Optical fibre Ring coupler reroutes the PROFIBUS from copper conductors to optical fibres. The coupler is a passive bus participant. The transmitter and receiver for the optical fibre ring coupler are activated in an intrinsically safe way, thereby ensuring that the transmission power of the transmitter does not exceed the permitted limits. The electronics for the signal conversion are accomodated in the flameproof MODEX enclosure – Transmitter and receiver for the Optical fibre-coupler are intrinsically safe headed. The intrinsically safe control transmitter and receiver of the electronic system guarantee that the transmitter rate does not go beyond maximum value limits.


Depending on the topology, several devices can be arranged in a ring. The ring must contain a master device. All other devices should be configured as slaves. The master must be connected to the level above it (e.g. control system).

Technical data *

Protection class At least IP 20
Structure Clip-on enclosure to TH 35
Dimensions see data sheet
Material High-quality thermoplastic
Storage temperature -40 °C to +70 °C
Weight 600 g
Display LEDs on front panel
operation: LED green
active bus: LED yellow
Voltage Supply voltage: DC 20 V to DC 30 V
Power dissipation 1.50 W (Module)
Bus interface Bus input/output:
2-wire remote bus with screw terminals
LWL input/output:
FSMA Optical fibre plug-in connectors or
ST Optical fibre plug-in connectors
Galvanic isolation Bus//power supply//optical fibre
Connection 2.5 mm², fine stranded

*Refer to the documentation for more detailed information


Data Sheet - RS485/PROFIBUS LWL Ring-coupler

Declaration of Conformity 01-7311-7C0003