Cable Current Capacity

Current-carrying capacity of the DeviceNet network cable is restricted as below:

	Trunk Line		Drop Line (Unit: A)
	Thick Cable	Thin Cable
Current Capacity	8A	3A	4.57 / Drop Line Length (m) ≤ 3A

Following figures illustrate examples of power supply configuration.

When an external power supply is installed in the network as shown in the figure below, the current capacity is 11A and it exceeds the permissible current of the cable.

If the location of the external power supply is changed as shown in the figure below, the power supply can be used because the current capacity on the left side of the power supply tap is 5 A and 6 A on the right side.

If the current capacity consumed in the network exceeds the restriction of cable current capacity, it is possible to install more than one power supply in the network. If you attempt to install two or more power supplies, take necessary measures (pulling out a fuse on the power supply tap, etc.) to avoid conflicts between power outputs from multiple power supplies.

The following figure illustrates wiring sample. An OMRON power supply tap is used in the example.

CAUTION

---

Incorrect wiring may cause node malfunction and severe damage to the entire DeviceNet network. Carefully connect the wires.