User manual

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 95
Communication Networks Chapter 5
Data Highway Plus (DH+)
Network Communication
For DH+ network communication, you have two module options for use in the
ControlLogix chassis. Tab l e 20
lists the DH+ modules and capabilities.
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
The DH+ network also provides the following:
• Data exchange between controllers
• Plant-wide data sharing
• Cellular level data sharing
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.
Table 20 - DH+ Modules and Capabilities
RIO Module Is used to
1756-DHRIO • 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.
1756-DHRIOXT • 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.
• Operate in extreme environments with -25…70 °C (-13…158 °F) temperatures.