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36 • The WAGO-I/O-SYSTEM 750

Shielding (Screening)

WAGO-I/O-SYSTEM 750

PROFIBUS

2.8 Shielding (Screening)

2.8.1 General

The shielding of the data and signal conductors reduces electromagnetic

interference thereby increasing the signal quality. Measurement errors, data

transmission errors and even disturbances caused by overvoltage can be

avoided.

Attention

Constant shielding is absolutely required in order to ensure the technical

specifications in terms of the measurement accuracy.

The data and signal conductors should be separated from all high-voltage

cables.

The cable shield should be potential. With this, incoming disturbances can be

easily diverted.

The shielding should be placed over the entrance of the cabinet or housing in

order to already repel disturbances at the entrance.

2.8.2 Bus Conductors

The shielding of the bus conductor is described in the relevant assembly

guideline of the bus system.

2.8.3 Signal Conductors

Bus modules for most analog signals along with many of the interface bus

modules include a connection for the shield.

Note

For better shield performance, the shield should have previously been placed

over a large area. The WAGO shield connecting system is suggested for such

an application.

This suggestion is especially applicable when the equipment has a great deal

of wear. Where the equipment can have even current or high impulse formed

currents running through it (for example through atmosphericend loading).

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Sharp DP-750 Manual de Serviço Página 36