Chapter 8: DeviceNet SmartController EX User’s Guide, 11069-000 Rev. F Page 85 of 92 Table 8-2. 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 Data Packets 0-8 bytes Bus Topology Linear (trunk line/drop line); power and signal on the same network cable Bus Addressing Multi-Master and Master/Slave special case; polled The baud rate of the system depends on the length of the network (end-to-end) and the type of cable. The following table shows how cable selection and trunk line length affect the max- imum data rate on the network.
The figure DeviceNet Thick Cable on page 85 shows a thick cable, and the figure DeviceNet Thin Cable on page 86 shows a thin cable. Table 8-3. DeviceNet Data Rates Relative to Cable Type and Length Data Rates 125 Kbps 250 Kbps 500 Kbps Thick Trunk Length 500 m 250 m 100 m (1,640 ft) (820 ft) (328 ft) Thin Trunk Length 100 m 100 m 100 m (328 ft) (328 ft) (328 ft) Maximum Drop Length 6 m 6 m 6 m (20 ft) (20 ft) (20 ft) Cumulative Drop Length 156 m 78 m 39 m (512 ft) (256 ft) (128 ft) Figure 8-2.
DeviceNet Thick Cable 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)