Data Highway Plus (DH+) Network Communication

For
DH+™
 network communication, you have two module options for use in the
ControlLogix®
 chassis. This table lists the
DH+™
 modules and capabilities.
DH+ Modules and Capabilities
RIO Module
Description
1756-DHRIO, 1756-DHRIOK
  • Function as a remote I/O (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.
  • Use for standard communications only.
1756-DHRIOXT
  • Performs the same functions as a1756-DHRIO module.
  • Operates in extreme environments with -25…+70 °C (-13…+158 °F) temperatures.
  • Use for standard communications only.
For
DH+™
 network communication, use a 1756-DHRIO or 1756-DHRIOXT module in the
ControlLogix®
 chassis to exchange information between these controllers:
  • PLC and
    SLC™
     controllers
  • ControlLogix®
     controllers and PLC or
    SLC™
     controllers
  • ControlLogix®
     controllers
You can connect a maximum of 32 stations to one
DH+™
 link:
  • Channel A supports 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.
  • Channel B supports 57.6 Kbps and 115.2 Kbps.
DH+ Network
DH+ Network

Communicate Over a DH+ Network

For the controller to communicate to a workstation or other device over a
DH+™
 network, use Linx-based communication 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 or 1756-DHRIOXT module.
The 1756-DHRIO or 1756-DHRIOXT 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.
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