
B-63404EN/03 CONNECTION 1.CONNECTING DeviceNet FUNCTIONS
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1.6 GROUNDING THE CABLE WIRES
Wire the cable referring to the figure below when connecting the
cable to the connector.
Grounding the network
In the DeviceNet specification, it is recommended that only one place
on the network be grounded and a place as near as possible to the
center of the network be grounded to prevent a ground loop.
As shown in the figure above, connect the shielded lead of the cable
to frame ground (FG) for the communications power supply and
ground FG to a maximum resistance of 100.
When multiple power supplies are used, connect and ground the
shielded lead only at the power supply near the center of the network.
Do not connect the shielded lead to the frame ground of other power
supplies, and ground these FGs to a maximum of 100. When you use
multiple power supplies, user a special power supply tap made by
other manufacturers.
Only one communications power supply:
Two or more communications power supplies:
Power line (V+)
Power line (V-)
V+
Signal line (CAN_H)
1
Communications
power supply
DeviceNet
Board
Connector
Drain wire/shield
32 4 5
Signal line (CAN_L)
V- FG
100 ? min.
Master
Power
supply
Slave
T-branch tap or power supply tap
Master
Power
supply
Slave
Power
supply
Slave
Power
supply
Ground at only one location near the center
tap