Rockwell Automation 1329I DeviceNet Option FRN 1.XXX - Manual (Page 86)

Glossary-2
D Data Rate
The data rate, sometimes called baud rate, is the speed at which data is
transferred on the DeviceNet network. The available data rates depend on
the type of cable and total cable length used on the network:
Each device on a DeviceNet network must be set for the same data rate. You
can set the DeviceNet option to 125 K, 250 K, or 500 K. You can set it to
Autobaud if another device on the network has set the data rate.
DeviceNet Network
A DeviceNet Network is a producer/consumer Control Area Network
(CAN) that connects controllers (e.g., PLCs and SLCs) and devices (e.g.,
drives and motor starters). Both implicit (control I/O) and explicit
(configuration) messages can be transmitted over the network. A DeviceNet
network can support a maximum of 64 devices. Each device is assigned a
unique node address and transmits data on the network at the same data rate.
A cable is used to connect devices on the network. It contains both the
signal and power wires. Devices can be connected to the network with drop
lines, in a daisy chain connection, or a combination of the two.
Figure G.1 Example DeviceNet Network
General information about DeviceNet and the DeviceNet specification are
maintained by the Open DeviceNet Vendor’s Association (ODVA) at
http://www.odva.org.
Maximum Cable Length Based on Data Rate
Cable 125 K 250 K 500 K
Thick Trunk Line 500 m (1,640 ft.) 250 m (820 ft.) 100 m (328 ft.)
Thin Trunk Line 100 m (328 ft.) 100 m (328 ft.) 100 m (328 ft.)
Maximum Drop Length 6 m (20 ft.) 6 m (20 ft.) 6 m (20 ft.)
Cumulative Drop Length 156 m (512 ft.) 78 m (256 ft.) 39 m (128 ft.)
Node Description
0 SLC Scanner. PLC and SLC scanners connect controllers to the network.
1 1329I Integrated Drive/Motor with a DeviceNet option.
2 1305 drive using a 1203-GK5 module. Many products (including sensors, push buttons,
motor starters, simple operator interfaces, and drives) can be connected to a DeviceNet
network.
62 Computer using a 1784-PCD adapter. A computer running software such as DeviceNet
Manager can be used to configure the network and devices.
Allen-Bradley AB
Node 0 Node 1 Node 2 Node 62
DeviceNet