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Terminating Resistors 

Terminating  resistors must be used if the C-BOX is 
installed at the beginning or end of the PROFIBUS cable 
segment. In this case, it is recommended to use 
PROFIBUS connectors which contain an integrated 
terminating resistor. It is recommended to use connectors 
from ERNI and Siemens. If the bus is incorrectly 
terminated, this can lead to errors in data transfer or to 
damage to other stations on the bus. 

 
Bus Connectors 

It is recommended to use only commercially available 
PROFIBUS connectors for connecting the bus. It is 
recommended to use connectors from ERNI and Siemens. 

 
Cable Shield 

Shielded cables are less sensitive to interference due to 
electromagnetic fields. With shielded cables, the 
interference currents are led to ground through the 
shielding rail, which is electrically connected to the case. 
To ensure that the interference currents which flow 
through the shielding do not themselves interfere with 
other devices, it is important to provide a low impedance 
connection to the protective ground. Observe the following 
rules for the shields of the PROFIBUS cable and the serial 
interface cable: 
– 

The braiding of the shielding should have a 
degree of coverage of more than 80%. 

– 

The shielding should include a braided shield and 
should not consist solely of foil shielding, since 
the latter can be easily damaged by cable tension 
and pressure. 

– 

To ensure good immunity to interference at high 
frequencies as well, the shielding of the cable 
should be attached to the shielding rail at both 
ends of the cable. 

 
When connecting up the C-BOX 3X0, it is recommended to observe the guidelines in 
the VDE 0100 regulations for handling electrical equipment. 
 
 

 

 

 
 

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