Rockwell Automation Allen-Bradley 193-DNENCAT, User Manual

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Rockwell Automation Publication 193-UM014A-EN-P - July 2011 29
Chapter
4
Connection Devices to the DeviceNet
Network
Introduction In this chapter, you will be able to assign an address to each DeviceNet module
and configure the DeviceNet scanner to scan up to six modules.
Set the Node Address for a
DeviceNet Module Each module being added to the DeviceNet network must have a unique network
mode address. A unique network node address can be created by using hardware
devices (e.g., DIP and Selector Switches) or by the Node Commissioning tool
from the internal web interface of the Ethernet/IP Communications Auxilliary.
The following chart shows the recommended node addresses.
Table 5 - Recommended Node Addresses
Assign this
Device: This
Node Address:
Notes:
Scanner 0 • For multiple scanners, assign the lowest addresses in
sequence (0, 1...).
Any Device on the
Network
(except the scanner) 1...61 • Give the lower addresses to devices with 15 bytes or
more of input or output data.
• Gaps between addresses are acceptable and have no
effect on system performance. If the final layout of the
system is not certain at this time, leave gaps between
addresses to allow flexibility as the system is
developed.
Computer Interface
to the Network 62 • If a computer is connected directly to the DeviceNet
network, use address 62 for the computer. The reason
for this is that many computer interface devices use 63
as the default address.
• The 1784-U2DN device can connect a computer directly
to a DeviceNet network.
New DeviceNet
Module 63 • To avoid conflict, always leave address 63 open. This is
due to the following:
– most DeviceNet devices have a factory preset
address of 63.
– leaving address 63 open allows for configuration of a
new device.
– the auto-address recovery feature requires address
63 to be open.
• Some devices do not have switches or push buttons to
set the address. Therefore, the device must first be
connected to the network then software (e.g.,
RSNetworx for DeviceNet) must be used to change the
address.
• If another device is already using address 63, an address
conflict will occur and communication will not occur
with the newly connected device.