Rockwell Automation 1779-KP5_KP5R ORD.1779-5.3 - Manual (Page 12)

Overview of the
1779ĆKP5 Module
Chapter 2
2Ć6
You cannot connect nodes to Data Highway Plus links that are part of a
bridge configuration. Also, make sure that both 1779-KP5 modules in a
bridge configuration assign the same link number to the Data Highway
Plus link.
You can also assign a link number to a Data Highway Plus link that is not
part of a bridge configuration. This would allow you to address up to
64 nodes on the Data Highway Plus link, instead of the 15 node limitation
when you do not assign a link number. If you choose to assign a link
number, however, you must also use station-management commands to
set communication routes on your network. For more information on
addressing, refer to Chapters 4 and 5.
You set the address for a link using switches on the 1779-KP5. For
information on how to set the link number on a 1779-KP5, refer to the
switch-setting information in Chapter 3.
When you use a 1779-KP5 in a bridge configuration, you must set
switches on the module to enable route updates.
When you enable route updates, the 1779-KP5 module sends a route
update message onto the network. This update message tells other
Series B modules on the network which links are accessible through the
1779-KP5 that sent the message. The route update also specifies the
number of “hops” or bridges that a message must travel through to reach
each link.
The following example shows a typical bridge configuration example:
1779ĆKP5
Data Highway II Data Highway II
1779ĆKP5
Data Highway Plus
Link 10 Link 4 Link 8
Node 20 Node 30
16486
In the previous example, the 1779-KP5 on Link 8 (Node 30) broadcasts a
route update to the 1779-KP5 on Link 10 (Node 20). This route update
tells Node 20 where to forward all messages bound for Link 8. Node 20
forwards this route update information to any other Series B modules on
Link 10. By forwarding the route information, the other Series B modules
How the 1779ĆKP5 Routes
Messages to Other Data
Highway II Links