User manual

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 97
Communication Networks Chapter 5
Universal Remote I/O (RIO)
Communication
For universal remote I/O communication, you have two module options for use
in the ControlLogix chassis. Ta b l e 2 1
lists the RIO modules and capabilities.
When a channel on the 1756-DHRIO or 1756-DHRIOXT 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.
The 1756-RIO module transfers digital, block transfer, analog, and specialty data
without message instructions.
Figure 14 - ControlLogix Universal Remote I/O Communication Example
Communicate Over a Universal Remote I/O Network
For the controller to control I/O over a universal remote I/O network, you must
complete these tasks.
Table 21 - 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 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.
1756-DHRIOXT • Function as an RIO scanner.
• Support 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.
• Operate in extreme environments with -25…70 °C (-13…158 °F) temperatures.
Universal Remote I/O Network
ControlLogix
PLC-5
1746-ASB
1771-ASB
1794-ASB