User Documentation
2053260000/05/2015126
Installation
The component approach taken with PROFINET means that a
compulsory acceptance test doesn't have to be run to check the
cabling if using PROFINET components with a manufacturer's
declaration. An acceptance measurement can however be
undertaken to:
• measure and document the cable length
• measure and document the attenuation and other key cable
parameters
This gives you reference data that you can refer back to when
testing the cabling later on.
Contact the manufacturer of the measuring device if you need more
detailed information. For operation, always read the manufacturer's
instructions.
If the insertion loss of a section falls below a value of 4 dB at the
measured frequency, the measured value for near-end crosstalk
(NEXT) is for information only. This is known as the "4 dB rule".
With short connections in particular, the insertion loss will be less
than 4 dB.
(Source:PROFINETCommissioningGuideline,Version1.01,July2010)