Physical Layer and Media Features
Section 1 Introduction
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Physical Layer and Media Features
The DeviceNet Physical Layer and Media includes the following features:
•
Uses Controller Area Network (CAN) technology.
•
Small size and low cost.
•
Linear bus topology.
•
Ability to operate at three data rates:
–
125 kBaud up to 500 m (
1640 ft)
maximum.
–
250 kBaud up to 250 m (820 ft) maximum.
–
500 kBaud up to 100 m (328 ft) maximum.
•
Bus wires containing both signal and power conductors.
•
Low loss, low delay cable.
•
Supports various media for drop line or trunk line.
•
Supports drop lines upto 6 m (20 ft).
•
Supports up to 64 nodes.
•
Node removal without severing the network.
•
Ability to support both isolated and nonisolated Physical Layers
simultaneously.
•
Supports sealed media.
•
Protection from wiring errors.
DeviceNet and Ethernet/IP share a common upper layer protocol called Common
Industrial Protocol (CIP). ABB's implementation leverages on this commonality and
allows DeviceNet devices to coexist at the controller level with EtherNet/IP. The
relationship of DeviceNet Physical Layer to EtherNet/IP is shown in
.
www.odva.org
.