PROFIBUS OLM and PROFIBUS OLM Configuration Siemens

What is PROFIBUS OLM?

PROFIBUS OLM is designed for use in optical PROFIBUS fieldbus networks. They allow conversion between electrical PROFIBUS (RS-485) to optical interface and vice versa.

The modules can be integrated in existing PROFIBUS fieldbus networks with known parameters

Advantages of optical transmission technology Complete PROFIBUS fieldbus networks can also be set up with modules in linear (bus), star or ring topology as well as any module connection combination of these topologies.

To increase the reliability of the fieldbus network in case of failure, redundant rings are supported.

Optical range

The power channel is designed as a 9-pin D-sub socket. An RS-485 bus segment complying with the PROFIBUS EN 50170 /2/ standard can be connected to this channel.

The fiber optic cables are connected via BFOC1 /2.5 connector

Six multicolored LEDs indicate the current mode and any interruptions as well as the scale level on the optical interfaces.

Network Topologies

The following network topologies can be deployed with PROFIBUS OLM:

• Point-to-point connection
• Bus topology (linear)
• Star topology
• Redundant optical ring

Linear (bus) Topology

In a linear or bus structure, the single PROFIBUS OLMs are connected by two-fiber cables.
At the beginning and at the end of a line, modules with one optical channel are adequate, in-between modules with two optical channels are necessary.

Star Topology

Several modules are grouped together to form an active PROFIBUS star coupler. Further modules are connected to this via two-core fiber-optic cables. The modules of the star coupler are interconnected via the electrical channel (electrical star segment). All OLM types for different fiber-optic cables (plastic, PCF, glass) can be combined via the electrical star segment.

Ring Topology

This network topology is a special form of the bus topology. “Closing” the optical bus achieves high operational reliability in the network. A redundant optical ring can only be implemented using modules with two optical channels.

Redundant Optical Ring with two OLMs

Setting up a redundant optical ring with two PROFIBUS OLMs can be seen as special case of the redundant optical ring and can be implemented with the
following two configurations.

Example of linear topology

Equipment includes:

• PLC S7-1200 CPU1212
• Module Profibus master CP1243-5
• Profibus OLM
• ET200SP IM155-6DP HF

Result

The devices are connected to each other via Profibus OLM. Helps extend distance and control more Note than you first

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