Functional description
3.3 Supported FO fiber types
PROFIBUS Optical Bus Terminal (OBT)
10
Operating Instructions, 04/2016, C79000-G8976-C122-07
3.3
Supported FO fiber types
The OBT supports the fiber types listed in the following table:
Table 3- 1
Achievable FO cable distance between the two devices on optical PROFIBUS DP
Fiber type
Link length between 2 devices
Plastic FO cable 980/1000
μ
m with 2 fibers
and max. max. 200 dB/km cable attenuation
0.1 to 50 meters
PCF FO cable 200/230
μ
m with 2 fibers and
max. max. 10 dB/km cable attenuation
0 to 300 meters
The specified link length between the devices assumes that the partner devices use the
same optical components as the OBT. This is, for example, the case with the IM 153–2 FO
and IM 467 FO.
The transmission speed is not dependent on the fiber type used or the cable length. This can
be up to 12 Mbps.
The following accessories are available:
●
Plastic fiber-optic cable (sold in meters), connectors/polishing set and the assembly tool
for plastic fiber-optic cable
The plastic fiber-optic cables do not have connectors fitted. The plastic simplex
connectors can be fitted easily on site with the available tools.
●
PCF FO cable (preassembled)
PCF cables with 4 PCF simplex connectors fitted are available in fixed lengths.
3.4
Displays
The OBT has 4 LEDs to display the operating state.
L+ 24 V (green)
not lit:
Power supply missing or internal power supply is defective or short-
circuited
flashes:
Power supply present, transmission speed not yet set
lit green:
Transmission speed set, power supply functioning correctly