adept technology SmartController CS, User Manual

Page: 119 / 156

DeviceNet Physical Layer and Media
Adept SmartController User’s Guide, Rev. E 119
The baud rate of the system depends on the length of the network (end-to-end) and the
type of cable.
Table B-3
shows how cable selection and trunkline length affect the
maximum data rate on the network.
Figure B-2
shows a thick cable, and
Figure B-3
, a thin
cable.
Table B-2. Features of a DeviceNet Network
Network Size A maximum of 64 nodes [0...63]
Network Length Selectable, end-to-end network distance varies with speed
Baud Rate Distance (thick cable)
125 Kbps 500 m (1,640 ft.)
250 Kbps 250 m (820 ft.)
500 Kbps 100 m (328 ft.)
Data Packets 0-8 bytes
Bus Topology Linear (trunkline/dropline); power and signal on the same
network cable
Bus Addressing Multi-Master and Master/Slave special case; polled
System Features Removal and replacement of devices from the network under
power not supported by Adept
Table B-3. DeviceNet Data Rates Relative to Cable Type and Length
Data Rates 125 Kbps 250 Kbps 500 Kbps
Thick Trunk Length 500 m
(1,640 ft.) 250 m
(820 ft.) 100 m
(328 ft.)
Thin Trunk Length 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.)