Description
2.2 Structure of PROFIBUS networks
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
33
2.2.3.2
Network components in optical networks
Active network components
The following active network components are available for PROFIBUS in optical networks:
●
Optical Link Module OLM
●
Optical Bus Terminal OBT
Optical Link Module OLM
You can use the PROFIBUS Optical Link Modul OLM to install PROFIBUS networks in line,
star structure and redundant ring structure.
The transmission rate of a fiber-optic cable line does not depend on the distance and can be
9.6 kbps to 12 Mbps.
Applications for OLM include, for example, plant buses on PROFIBUS base, networking
across buildings using glass fiber-optic cables, mixed networks with electrical and optical
segments, large networks (road tunnels, traffic guidance systems) and networks with high
demands on availability (redundant ring networks).
Optical Link modules can be combined by means of an RS485 interface and individual
devices or entire electrical segments can be integrated into the optical PROFIBUS network.
The following distances may not be exceeded between two OLMs regardless of the optical
power budget:
●
OLM/P11, OLM/P12: 400 m
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OLM/G11, OLM/G12, OLM/G12-EEC: 3 km
●
OLM/G11-1300, OLM/G12-1300: 15 km
Optical Bus Terminal OBT (optical bus terminal)
The Optical Bus Terminal connects an individual PROFIBUS device without integrated
optical interface or a PROFIBUS RS 485 segment with up to 31 devices to an optical
PROFIBUS.
An individual PROFIBUS DP device is connected with its RS 485 interface by means of a
PROFIBUS cable with integrated terminating resistor, for example, connecting cable 830-1T,
to the RS 485 interface of the OBT. The OBT is integrated into the optical line by means of
two optical interfaces.
The following optical transmission media can be connected to the OBT:
●
Plastic fiber-optic cable up to 50 m single distance length. They can be assembled on-site
with two 2x2 Simplex connectors.
●
PCF fiber-optic cable up to 300 m single distance length. The cables are delivered
pre-assembled.
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