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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

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Allen-Bradley ControlLogix Manual do Utilizador Página 97