Siemens SINAMICS S120 Installation And Start-Up Manual page 86

Communication via PROFIBUS
Commissioning PROFIBUS
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:
4-86
/GH1/ SINAMICS S120 Equipment Manual
Control Units and Additional
System Components
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
E Siemens AG, 2004. All rights reserved