Technical data

Network configuration
3.2 Configuring optical networks
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
49
Transmission link
An optical transmission path consists of a transmitter, the optical fiber, and a receiver.
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Figure 3-2 Structure of a link
Transmitter
The transmitter in an optical digital transmission system consists of a signal converter that
converts the digital signals from the electronics into a pulse type suitable for the electro-
optical converter, and an electrooptical converter (E/O converter) that converts the electric
pulses to optical signals. In SIMATIC NET PROFIBUS, LEDs (LED = Light Emitting Diode)
are used as E/O converters. Generally, the LEDs are specially adapted to the various
transmission media.
Transmission media
The following types of fiber-optic cable are used as the transmission media SIMATIC NET
PROFIBUS:
● Plastic fiber-optic cables
● PCF fiberoptic cables (polymer cladded fiber)
● Glass fiber-optic cables
For more detailed information about the various fiberoptic cables for SIMATIC NET
PROFIBUS, refer to section "
Passive components for optical networks (Page 189)".
Receiver
The receiver of a digital optical transmission system consists of an optoelectric converter (a
photodiode), that converts the optical signals to electrical signals and a signal converter that
converts the electrical pulses received from the diode into signals compatible with the
connected electronics.
Attenuation
The attenuation of the transmission path is determined by the following factors:
● The choice of optical fiber
● The wavelength of the transmit diodes
● The type of connector