WAGO 750-306 Technical Description page 35

2.7.3 Protective Earth
For the field level, the ground wire is placed onto the lower connection termi-
nals 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 re-
supplied.
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 poten-
tial is still maintained.
During the ring feeding, the ground wire is connected at the beginning and end
of the potential group.
Fig. 2-24: Ring-feeding
WAGO-I/O-SYSTEM 750
DeviceNet
The WAGO-I/O-SYSTEM 750
Grounding
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