34• The WAGO-I/O-SYSTEM 750

Grounding

2.7.2 Function Earth

The function earth increases the resistance capacity against disturbances from electro-mechanical influences. Some components in the I/O system have a carrier rail contact that dissipates electro-magnetic disturbances to the carrier rail.

Attention

Care must be taken to ensure the flawless electrical connection between the carrier rail contact and the carrier rail.

The carrier rail must be grounded.

For information on carrier rail properties, please see chapter 2.5.3.2.

WAGO-I/O-SYSTEM 750

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2.7.3 Protective Earth

For the field level, the ground wire is placed onto the lower connection terminals of the power supply terminals and further reached through the lower power contacts to the neighboring bus terminals. If the bus terminal has the lower power contact, then the ground wire connection of the field devices can be directly connected to the lower connection terminals of the bus terminals.

Attention

If the connection of the power contacts for the ground wire within the node is disrupted, e.g. due to a 4-channel bus terminal, then the potential has to be resupplied.

The ring feeding of the earth potential can increase the system security. In the event that a bus terminal is ripped out of the potential group, the earth potential is still maintained.

During the ring feeding, the ground wire is connected at the beginning and end of the potential group.

WAGO-I/O-SYSTEM 750

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