Siemens SIMATIC NET PROFIBUS manual Topologies of Optical Networks

Topologies of SIMATIC NET PROFIBUS Networks

Table 2-1 Bus Attachment Components for Transmission Rates up to 12 Mbps, continued

Optical Bus Terminal OBT	6GK1 500-3AA0
PROFIBUS Terminator	6ES7 972-0DA00-0AA0

2.2Topologies of Optical Networks

Interfacing Electrical and Optical Networks/Components

If you want to cover larger distances with the fieldbus regardless of the transmission rate or if the data traffic on the bus is threatened by extreme levels of external noise, you should use fiber-optic cables instead of copper cable.

To interface electrical cables with fiber-optic cables, you have the following possibilities:

SThe PROFIBUS nodes with a PROFIBUS DP interface (RS-485) are attached to the optical network using an optical bus terminal (OBT) or using an optical link module (OLM).

SPROFIBUS nodes with an integrated FO port (for example ET 200M (IM 153-2 FO), S7-400 (IM 467 FO)) can be connected directly to an optical network with a bus topology.

SOptical networks with a larger network span or structured as redundant rings should be implemented using OLMs.

The structure of optical networks using optical link modules (OLMs) is described in detail in later chapters in this manual.

For information about the structure of an optical PROFIBUS network with PROFIBUS nodes having an integrated FO interface, refer also to the ET200 system manual.

PROFIBUS Networks SIMATIC NET	2-5
6GK1970-5CA20-0AA1 Release 2 05/2000