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<2. Overview of DeviceNet >
2-1
IM 34M6H28-01E
1st Edition : Feb.01,1999-00
2.
Overview of DeviceNet
An explanation of the functions which are supported by this module and which are related
to the DeviceNet specifications is given here.
SEE ALSO
1) For details on the DeviceNet specifications, see also to the DeviceNet Specifications Manual, published
by ODVA (Open Device Net Vendor Association, Inc.). ODVA is a non-profit company, formed by vendors
with the objective to promote and manage the DeviceNet specifications.
2) For product information of third-party products required for network configuration, refer to Appendix 2,
“Information on Third-party Products.”
2.1
Network Configuration
The network configuration of DeviceNet is given below.
Node
Node
Node
Node
Node
Node
Node
Tap
Tap
Power
supply Tap
Network
power supply
Terminating resistor
Node
Node
Node
Multiple-node
daisy chain
T-branching
Drop-line branching
Trunk line
Drop line
F0201.EPS
Tap
Tap
Tap
Terminating resistor
Figure 2.1 Network Media Topology
The elements of the network configuration are explained below.
• Node
A device (equipment) that is connected to DeviceNet is called a node. A node can be either
a master, which collects and distributes data, or a slave, which outputs and inputs data
according to the instructions received from the master.
There are no restrictions on the arrangements or maximum number of devices that can be
connected to the master of each of the slaves. A maximum of 64 devices can be freely
connected (without arrangement restrictions).
An address from 0 to 63, called MACID (Media Access Control Identifier), is assigned to
each node. In this manual, these addresses are called node addresses.
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