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22
Device Description
3.4.4
Shielding
3.4.4.1
General
Shielding of the data and signal lines reduces electromagnetic interference, thus
enhancing signal quality. Measurement errors, data transmission errors, and even
destruction due to excessive voltage can be prevented this way.
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.
Improve shielding performance by placing the shield over a large area!
Higher shielding performance is achieved via low-impedance connection between
shield and ground. To achieve this, 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 emissions (e.g., frequency converter or drives).
3.4.4.2
Bus Lines
The shielding of bus lines is described in the respective configuration guidelines
and standards for the bus system.
3.4.4.3
Signal Lines
Use shielded signal lines!
Use only shielded signal lines for serial and analog signals. Only then can you
ensure that the accuracy and interference immunity specified for the respective
I/O module can be achieved, even in the presence of interference acting on the
signal cable.
Signal lines for analog signals must be shielded. The shield for the signal lines
must be connected to Terminal 38 (Shield) of the TO-PASS
e.g., via the DIN rail.
761-114 Telecontrol Module Compact, 2 AI, Web, MODBUS485
WAGO-TO-PASS® 761
®
telecontrol module,
Manual
Version 1.0.0
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