Allen-Bradley devicenet modules in logix5000 control systems Manuel D’Utilisation
Publication DNET-UM004A-EN-P - March 2004
1-10 Before You Begin
If You Want to Use a Higher Baud Rate…
The length of the trunkline and type of cable determines which baud
rates you can use:
rates you can use:
If you change the baud rate of your network, make sure that all
devices change to the new baud rate. Mixed baud rates produce
communication errors.
devices change to the new baud rate. Mixed baud rates produce
communication errors.
To set the baud rate for the network:
1. Connect the network interface to the network and set its baud
rate.
2. Connect the scanner to the network and set its baud rate.
3. For each device that has only fixed baud rates (no autobaud),
set the baud rate and connect it to the network.
4. Connect the remaining devices to the network and enable
autobaud for each of them.
Baud rate
Maximum distance
Cumulative drop line
length
length
flat cable
thick cable
thin cable
125K bit/s
420m (1378 ft)
500m (1640 ft)
100m (328 ft)
156 m (512 ft)
250K bit/s
200m (656 ft)
250m (820 ft)
100m (328 ft)
78m (256 ft)
500K bit/s
75m (246 ft)
100m (328 ft)
100m (328 ft)
39m (128 ft)
If a device:
Then:
has a switch to enable
autobaud
autobaud
A. Set the switch to autobaud.
B. Connect the device to the network.
does not have a switch to
enable autobaud
enable autobaud
A. Connect the device to the network.
B. Use RSNetWorx software to enable
autobaud.