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Appendix B - Adept DeviceNet
Figure B-5. Example of a Terminating Resistor Installation on a DeviceNet Bus
Power Supply and the DeviceNet Bus
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.
Power Capabilities of a DeviceNet Cable System
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.
122
Pin 4
Terminating
Resistor
WARNING:
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.
Adept SmartController User's Guide, Rev. E
Pin 5
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