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Wiring Instructions
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netTAP NT 50 | Gateway Devices
DOC091202UM09EN | Revision 9 | English | 2013-02 | Released | Public
© Hilscher, 2010-2013
10.3 PROFIBUS
Please ensure that termination resistors are available at both ends of the
cable. If special PROFIBUS connectors are being used, these resistors are
often found inside the connector and must be switched on. For baud rates
above 1.5 MBaud use only special connectors, which also include addi-
tional inductance.
It is not permitted to have T-stubs on PROFIBUS high baud rates. Use only
a special cable which is approved for PROFIBUS-DP. Make a solid connec-
tion from the cable shield to ground at every device and make sure that
there is no potential difference between the grounds at the devices.
If the Hilscher device is linked with only one other device on the bus, they
must be at the ends of the bus line. The reason is that these devices must
deliver the power supply for the termination resistors. Otherwise the Master
can be connected at any desired position.
Figure 12: PROFIBUS-DP-Network
Up to 32 PROFIBUS devices can be connected to one bus segment. If
several bus segments are linked to each other with repeaters, there can be
up to 127 devices on the network.
Only PROFIBUS certified cable, preferably the cable type A, should be
used.