Instructions

Line Tests
© KUNBUS 5
4 Line Tests
4.1 Line Measurement
Generally, measurements regarding line physics can only be
made from one end of the PROFIBUS line. If you try to
measure from any other place within the segment, you will
obtain faulty results.
Furthermore please make sure that during measurements no
Master is polling the bus or is sending tokens. Pure PROFIBUS
DP Slave devices as well as e.g. repeaters and optical couplers
must not be disconnected from the bus. An oversight over the
possible measuring points in line segments for line
measurement is depicted below:
S
M
T
R
T
S S S S
S S S S S
TT
T
M
S
R
= Terminato
r
= Maste
r
= Slave
= Repeater / Segment coupler / Optical coupler
= Segment 1 = Segment 2
= Measuring point
Figure 1: Connection NetTEST II in the cable thread