Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 48)

48 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Chapter 4 Using Programming Software in DH+ Applications
An equivalent routing (via the DH+ network) with ControlLogix is shown in
the following figure.
ControlLogix Routing
In the ControlLogix system, you complete the same tasks as in Pyramid
Integrator Emulation; however, the presentation is graphical instead of tabular.
The ControlLogix routing protocols use CIP, a message-based protocol that
implements a relative path to send a message from the source device in a system to
the destination device. In this way, the source device in a networks system
contains the path information that steers the message along the proper route to
reach its destination. Because the source device holds this information, other
devices along the path simply pass this information; they do not need to store
it.
ControlLogix routing has two significant benefits:
• You do not need to configure routing tables in the bridging module, greatly
simplifying maintenance and module replacement.
• You maintain full control over the route taken by each message, enabling
you to select alternative paths for the same end device.
ControlLogix System A ControlLogix System B
Data Highway Plus
43342
Link 1 Link 2 Link 3 Link 4
ControlLogix System A routing table
in RSLinx software ControlLogix System B routing
table in RSLinx software
11 12