102 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 5 Communication Networks
Communicate Over a DH+ Network
For the controller to communicate to a workstation or other device over a DH+
network, use RSLinx Classic software to do the following:
• Specify a unique link ID for each ControlLogix backplane and additional
network in the communication path.
• Configure the routing table for the 1756-DHRIO module.
The 1756-DHRIO module can route a message through up to four
communication networks and three chassis. This limit applies only to the routing
of a message and not to the total number of networks or chassis in a system.
For more information about configuring and using a DH+ network via the 1756-
DHRIO module, see the Data Highway Plus-Remote I/O Communication
Interface Module User Manual, publication 1756-UM514
.
Universal Remote I/O (RIO)
Communication
For universal remote I/O communication, you have two module options for use
in the ControlLogix chassis. This table lists the RIO modules and capabilities.
When a channel on the 1756-DHRIO module is configured for remote I/O, the
module acts as a scanner for a universal remote I/O network. The controller
communicates to the module to send and receive the I/O data on the universal
remote I/O network.
The 1756-RIO module can act as a scanner or adapter on a remote I/O network.
In addition to digital and block-transfer data, the 1756-RIO module transfers
analog and specialty data without message instructions.
Table 26 - RIO Modules and Capabilities
RIO Module Is used to
1756-RIO • Function as an RIO scanner and adapter.
• Support connections to 32 racks in any combination of rack size or block transfers.
• Update data to the ControlLogix controller by using scheduled connections.
1756-DHRIO • Function as an RIO scanner.
• Support either 32 logical rack connections or 16 block-transfer connections per channel.
• Establish connections between controllers and I/O adapters.
• Distribute control so that each controller has its own I/O.
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