Publication 1756-UM514B-EN-P - February 2003
3-2 Using Programming Software in DH+ Applications
Using RSLinx to Create a
Routing Table
DH+ protocols do not use the Control and Information Protocol (CIP),
the communication protocol used in the ControlLogix architecture.
The 1756-DHRIO module is the transition point from the DH+
network to ControlLogix. In this capacity, the 1756-DHRIO module
serves as the DH+ message source and requires a full message route,
or path, to deliver the message. A routing table, using link IDs and
node addresses, provides the full path.
What Is a Routing Table?
Before you can create a routing table for your 1756-DHRIO module,
you must assign link IDs to all networks (including ENET and CNET)
that route information through the module. Link IDs are numbers
from 1 to 199.
DH+ module addressing provides the link IDs and node addresses.
The routing table translates link IDs and node address information
into path, or routing, information. Thus, the routing table specifies a
'map' to other links in the system. Routing tables are set up at each
node to build accurate connections.
ControlLogix supports Pyramid Integrator (PI) routing and is
backward-compatible with existing DH+ products. The architecture
also provides newer routing protocols that are designed to make it
easier to maintain a system. The 1756-DHRIO module, as the
transition point between the ControlLogix architecture and the DH+
network, allows ControlLogix to use new protocols while maintaining
the option of backward-compatibility with existing DH+ products.
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