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3.5.4 The Network Grounding
For the DeviceNet, use 1-point grounding (class-3 grounding for control device only) for the
network grounding. If more than one point are grounded, the ground can loop. Conversely, the
network without being grounded is likely to malfunction due to external noises.
Use the power tap as the point for 1-point grounding. Connect the ground terminal of the power tap
with the FG terminal of the power unit before applying class-3 grounding for control device only as
shown in Figure 3.16. (Install a power tap near the center of the network and ground from it).
When more than one power units are used in the network, apply grounding to a power tap near the
center of the network.
Use a grounding line with a maximum of 3 meters (#8AWG power line).
FG V
−
V +
Power-supply
unit
Power tap
V
−
V +
Grounding
terminal
FG V
−
V +
Power-supply
unit
Power tap
V − V +
Grounding
termina
l
Power tap grounded Power tap not grounded
Figure 3.16 How to Install Your Network