Siemens SINAMICS S120 - Page 86

Communication via PROFIBUS
Commissioning PROFIBUS
4-86
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Bus terminating resistor and shielding
Reliable data transmission via PROFIBUS depends, amongst other things, on the
setting for the bus terminating resistors and the shielding for the PROFIBUS
cables.
S Bus terminating resistor
The bus terminating resistors in the PROFIBUS plugs must be set as follows:
– First and last nodes in the line: switch in terminating resistor
– Other nodes in the line: switch out terminating resistor
S Shielding for the PROFIBUS cables
The cable shield in the plug must be connected at both ends with the greatest
possible surface area.
References: /GH1/ SINAMICS S120 Equipment Manual
Control Units and Additional
System Components