Technical data

Testing PROFIBUS

A.2 Testing fiber-optic cable

PROFIBUS Network Manual

System Manual, Edition 04/2009, C79000-G8976-C124-03

251

The correlation between the measured output voltage and the signal quality is in the form of

a curve (see figure).

≈≈≈

Normal operation, level adequate

Measurement voltage in V

Optical link power margin reduced

Function not guaranteed

Received optical power at 660 nm/dBm

Received optical power at 1310 nm/dBm

Received optical power at 860 nm/dBm

4,0

3,5

3,0

2,5

2,0

1,7

1,4

1,0

0,8

0,6

0,4

0,2

0,1

-26 -6-8-10-12-14-16-18-20-22-24 -4

-26-28 -12-14-16-18-20-22-24

-26-28 -23 -19-21 -18-20-22-25 -24-29 -27

Figure A-6 Example Correlation between the measured voltage and signal quality with an OLM/G12

Further information

You will find more detailed information on the OLM in the IK PI catalog and on the Internet

(

http://support.automation.siemens.com/WW/view/en/24164176).