Siemens SINAMICS G150 Operating Instructions Manual page 102

Electrical installation
4.9 Signal connections
NOTICE
Damage to the Control Unit or other PROFIBUS nodes due to high leakage currents
Significant leakage currents can flow along the PROFIBUS cable if a suitable equipotential
bonding conductor is not used and destroy the Control Unit or other PROFIBUS nodes.
• An equipotential bonding conductor with a cross-section of at least 25 mm² must be
NOTICE
Damage to the Control Unit or other CAN bus nodes due to the connection of a CAN cable
If a CAN cable is connected to the X126 interface, this can destroy the Control Unit or other
CAN bus nodes.
• Do not connect any CAN cables to the X126 interface.
PROFIBUS connector
For the first and last participants in a bus line, the terminating resistors must be switched in,
otherwise, data transmission will not function correctly.
The terminating resistors are activated in the connector.
The cable shield must be connected at both ends and over a large surface area.
Connectors
The cables must be connected via PROFIBUS connectors as they contain the necessary
terminating resistors.
The figure below shows suitable PROFIBUS connectors with/without a PG/PC connector.
102
used between components in a system that are located at a distance from each other.
PROFIBUS connector
without PG/PC connection
6ES7972-0BA42-0XA0
PROFIBUS connector
with PG/PC connection
6ES7972-0BB42-0XA0
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A