36
System Description
WAGO-I/O-SYSTEM 750
750-806 Fieldbus Controller DeviceNet
TM
Manual
Version 2.0.0
3.7
Shielding
3.7.1
General
Use of shielded cables reduces electromagnetic interference and thus increases
signal quality. Measurement errors, data transmission errors and interference due
to excessive voltage can be prevented.
Connect the cable shield to the ground potential!
Integrated shielding is mandatory to meet the technical specifications in regards to
measuring accuracy. Connect the cable shield and ground potential at the inlet to
the cabinet or housing. This allows induced interference to dissipate and to be
kept away from devices in the cabinet or housing.
Figure 18: Cable Shield at Ground Potential
Improve shielding performance by placing the shield over a large area!
Higher shielding performance is achieved via low-impedance connection between
shield and ground. For this purpose, connect the shield over a large surface area,
e.g., WAGO shield connecting system. This is especially recommended for large-
scale systems where equalizing current or high impulse-type currents caused by
atmospheric discharge may occur.
Keep data and signal lines away from sources of interference!
Route data and signal lines separately from all high voltage cables and other
sources of high electromagnetic emission (e.g., frequency converter or drives).
3.7.2
Bus Cables
The shielding of the bus line is described in the respective configuration
guidelines and standards of the bus system.
