Nortech Systems XUSR User Manual

The DeviceNet network allows distribution of power supplies on the network cable 
system. Follow these general rules to achieve a safe and reliable operation:

• Use power supplies rated at 24V

• Minimize installation problems by using one power supply with sufficient 

current to operate all the attached nodes. This must comply with the national 
and international safety standards.

• Make sure that each power supply incorporates current limit protection.

• Make sure each power supply is temperature compensated.

• Provide over current protection for each segment of your DeviceNet cable 

installation.

NOTE: Adept does not supply the 24V operating voltage for the 
DeviceNet bus on the SmartController or any other Adept component.

A DeviceNet cable system has several power rating constraints. The cable type and the 
length of the cable specify the maximum current on a cable. Thick and thin cable have:

• 24 VDC power rating

• Optional power-supply tabs

If the power supplies are equipped with Schottky diodes, the optional power supply tabs 
must be protected from bus back-feeding of current among the power supplies on the bus. 
We also recommended the use of fuse protection for every trunkline in the cable system.

The DeviceNet specification requires that the 

CAN_H and CAN_L signal lines tolerate voltages up to 
18V. Since the supply voltage exceeds 18V, improperly 
wiring the supply voltage to these signal lines may cause 
permanent damage.

Pin 4

Pin 5

Terminating 
Resistor