Universal Remote I/O (RIO) Communication

For communication in a Universal RIO network, you have three module options for use in the
ControlLogix®
 chassis. This table lists the RIO modules and capabilities.
RIO Modules and Capabilities
Module
Description
1756-RIO, 1756-RIOK
  • Functions as an RIO scanner and adapter.
  • Supports connections to 32 racks in any combination of rack size or block transfers.
  • Updates data to the
    ControlLogix®
     controller by using scheduled connections.
  • Supports only standard communication.
1756-DHRIO, 1756-DHRIOK
  • Functions as an RIO scanner.
  • Supports 32 logical rack connections or 16 block transfer connections per channel.
  • Establishes connections between controllers and I/O adapters.
  • Distributes control so that each controller has its own I/O.
  • Supports only standard communication.
756-DHRIOXT
  • Performs the same functions as a 1756-DHRIO module.
  • Operates in extreme environments with -25…+70 °C (-13…+158 °F) temperatures.
  • Supports only standard communication.
When a channel on the 1756-DHRIO or 1756-DHRIOXT module is configured for Universal RIO communication, the module acts as a scanner for the network. The controller communicates to the module to send and receive the I/O data on the Universal RIO network.
The 1756-RIO module can act as a scanner or adapter on a Universal RIO network. The 1756-RIO module transfers digital, block transfer, analog, and specialty data without message instructions.
Universal RIO Network
Universal RIO Network

Communicate Over a Universal RIO Network

As you design your Universal RIO network, remember the following:
  • All devices that are connected to a Universal RIO network must communicate with the same communication rate. Available rates include the following:
    • 57.6 Kbps
    • 115.2 Kbps
    • 230.4 Kbps
  • You must assign unique partial and full racks to each channel used in Remote I/O Scanner mode. Both channels of a 1756-DHRIO or 1756-DHRIOXT module cannot scan the same partial or full rack address. Both module channels can communicate to 00…37 octal or 40…77 octal, but each channel can communicate only with one address at a time in whichever of these two ranges it falls.
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