Siemens SIMATIC NET PROFIBUS, Owner'S Manual, Page: 234 / 490

Active Components for Optical Networks
8-6
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Functions
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Automatic detection of all PROFIBUS data rates: 9.6 Kbps to 12 Mbps including
45.45 Kbps (PROFIBUS-PA)
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Implementation of the following network topologies:
Bus, star, redundant ring
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High availability with redundant media. Distance between two OLMs in the
redundant ring limited only by the maximum optical distance.
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Attachment to different types of fiber-optic transmission media (one or two
optical interfaces, BFOC connectors)
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Isolated RS-485 interface with segment capability (sub-D female connector)
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Unrestricted multimaster operation:
Extended segmentation function for limiting errors to FO and RS-485
segments
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Fast localization of faults:
– Display of the module status via floating signaling contact
– Testing of the FO path quality: Measuring output for optical receiver for
logging and detecting the fiber-optic signal quality with a voltmeter.
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High cascading depth:
Bus and redundant ring up to 122 OLMs (limited only by monitoring times)
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24 V DC power supply with redundant power supply option.
Note
The optical ports of the OLMs are optimized for greater distances. The direct
coupling of the optical ports of an OLM with an OBT or integrated optical ports is
not possible due to differences in the technical specifications.