PROFIBUS Optical Hub

FLEXtra® FO, 2-port
FLEXtra® FO, 2-port

650-2, SMA, 650 nm, POF/PCF

The FLEXtra® FO enables conversion of electrical MPI/PROFIBUS interfaces into optical MPI/PROFIBUS interfaces.

The FLEXtra® FO enables conversion of electrical MPI/PROFIBUS interfaces into optical MPI/PROFIBUS interfaces.
It reaches PROFIBUS transmission rates from 9.6 kbps to 12 Mbps with automatic transmission rate detection. Due to the optical signal transmission, it offers complete electrical isolation between the PROFIBUS participants and PROFIBUS subnets.
Another advantage of the FLEXtra® FO is its insensitivity to EMC influences.
The transmission signals are converted by the FLEXtra® FO into optical signals and sent across the fiber-optic link. In addition, the signals are regenerated in slope, level, and duty cycle.
It is also suitable for POF** and PCF*- FO.
For the short range up to 65 m, an optical transmission link can be established very quickly and without much effort using the POF**. For longer distances up to 250 m, PCF* FO can be used.
The optical interface of the  FLEXtra® FO sends in the visible range (650 nm red light), which allows an initial check of the optical transmission link without expensive instruments.
The FLEXtra® FO features integrated status LEDs for each segment for diagnostic purposes. In this way you are always informed about the state of the bus and the optical interface, and targeted troubleshooting is ensured.
In addition, the FLEXtra® FO has DIP switches for turning off individual or all segments. The segments are separated, but continue to function in themselves.

The FLEXtra® FO 650-2 SMA is a PROFIBUS repeater with an expansion by 2 visual MPI/PROFIBUS segments.

  • PROFIBUS transmission rates (9.6 kbps to 12 Mbps) are automatically detected
  • Switching off of individual or all segments possible
  • For use in EMC-hazardous environments
  • Suitable for POF** and PCF*-FO
  • Cable length POF** 65 m
  • Cable length PCF* 250 m
  • Display of traffic/bus errors for each FO and PROFIBUS segment
  • PROFIBUS repeater with 2 optical MPI/PROFIBUS segments
  • With SMA interface
Download PDF datasheet
General information
Order number 700-996-2BA01
Article name FLEXtra® FO 650-2, PROFIBUS Optical Hub, SMA, 650 nm, POF/PCF
Scope of delivery FLEXtra® FO 650-2, Anleitung
Dimensions (DxWxH) 35 x 70 x 72 mm
Weight Approx. 125 g
PROFIBUS interface
Number 1
Transmission rate 9.6 |19.2 | 45.45 | 93.75 |187.5 | 500 kbps
1.5 | 3 | 6 and 12 Mbps
automatic detection
Connection SUB-D female connector, 9-pin
Optical interface
Number 2
Wavelength 650 nm
Numerical aperture of the transmitting diode 0.50
Integrable optical power | receiver sensitivity POF¹ 980/1000 μm -7.5 dBm/-20 dBm
Integrable optical power | receiver sensitivity PCF¹ 200/230 μm -18 dBm/-22 dBm
Overdrive limit of the receiver -3 dBm
Bridgeable distance POF¹ 980/1000 µm (160 dB/km) 0 … 65 m
Bridgeable distance PCF¹ 200/230 µm (10 dB/km) 0 … 250 m
Connection SMA
Status indicator 7 LEDs, function status
Input voltage
Voltage supply 24 V DC, 18–30 V DC
Electrical isolation 500 V
Current draw incl. 5V loads Max. 200 mA
Current draw incl. 24V loads Max. 400 mA
Output voltage port X1
Voltage 1 5 V, max. 150 mA
Voltage 2 +18 ... +30 V DC, max. 200 mA (as with supply voltage)
Electrical isolation 500 V
Ambient conditions
Ambient temperature 0 °C … +60 °C
Transport and storage temperature -25 °C … +75 °C
Pollution degree 2
Protection rating IP20
Certifications CE

Technical Documentation

 Name Version Size Tags
FLEXtra® FO 650, Brief instruction 3 6 MB

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* PCF stands for polymer cladded fiber and is synonymous with HCS. For the PCF/HCS assembly, extra PCF/HCS connectors are required, along with a special assembly tool according to the required connector technology. You get the appropriate PCF/HCS connector from your fiber-optic cable supplier.


**POF stands for polymeric optical fiber.