Network Power/Grounding; Network Power Supply Method - Toshiba 2000 V Series Manual

3.5 Network Power/Grounding

In a DeviceNet network, the power for communication (24 VDC) is supplied through the
DeviceNet power cables (V+/V-) via the network connector. This section describes
network power supply to the DeviceNet cables and network power configuration.
Grounding the network is also explained.
3.5.1

Network power supply method

In order to supply the network power (24 VDC) to the DeviceNet cables, the power tap
(Figure 3-8) specified for the DeviceNet must to be used. The power tap is an apparatus
for connecting a 24 VDC power unit to a trunk cable. It has the following functions:
(1) To prevent reverse current flow to two or more 24 VDC power units, if connected to
one network, due to potential difference
(2) To support a maximum of 16 A from the power units directly connected to the tap
(3) To limit the current flow from the power tap to the cables to 8 A maximum with a
protective circuit (fuse or circuit breaker)
(4) To provide terminals for grounding the network.
Signal
Signal
Shield/drain
Power Tap Composition
Model
Manufacturer
6F8C0845
CAN_H
CAN_L
V −
V +
Grounding terminal
Figure 3-8 Power Tap Composition
1485T-P2T5-T5 (PowerTap)
Rockwell Automation
Power tap
Protective Protective
circuit circuit
Schottky
diode
V − V +
Network power unit
Maximum cable length from
power unit to power tap is 3 m.
3.5 Network Power/Grounding
DeviceNet cable
Trunk cable
35
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