Technical data

Testing PROFIBUS
A.2 Testing fiber-optic cable
PROFIBUS Network Manual
246 System Manual, Edition 04/2009, C79000-G8976-C124-03
Battery operation
The device has an accumulator battery. This ensures that the user can test the entire system
without requiring a power supply. The device is turned off automatically to save power after 3
minutes if no input is made ensuring that the battery has a long working life.
Ordering data
Table A- 1 BT 2000 hardware test device ordering data
Ordering data Order no.
BT 200 hardware test device (charging unit not included)
- with point-to-point cable for connecting to a node
- with test connector
- with operating instruction German/English
6ES7 181-0AA01-0AA0
Charging unit (230V AC / 2.4 - 10 V DC) 6ES7 193-8LA00-0AA0
Charging unit (110V AC / 2.4 - 10 V DC) 6ES7 193-8LA00-0AB0
Test connector (spare) 6EP8 106-0AC20
NC battery pack (spare) 6EP8106-0HA01
Pointtopoint cable (spare) 6EP8106-0HC01
The operating instructions can also be found on the Internet
(http://support.automation.siemens.com/WW/view/de/857969).
A.2 Testing fiber-optic cable
A.2.1 Necessity of a final test
The total loss on an FO transmission path, particularly the influence of splices, can only be
estimated roughly during planning. As a result of inaccuracies when creating the splices and
subjecting cables to excessive stress during installation, the actual loss may well be higher
than the calculated values. The only way to be sure that a fiberoptic link functions reliably
and has an adequate link power margin is to measure the loss following installation. It is
advisable to test every fiberoptic link in which the connectors were fitted onsite and to
document the results in an acceptance report.
Attenuation
Attenuation defined as the optical power loss in decibels (dB) is the decisive criterion in
optical networks. All the system components such as the cable, connectors, splices,
couplers etc. contribute to the total loss. To measure this loss, fiberoptic test units must be
used following installation. During the measurements, light with the same wavelength must
be used as in the optical transmission system.