Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 101
Communication Networks Chapter 5
Data Highway Plus (DH+)
Network Communication
For DH+ network communication, use a 1756-DHRIO module in the
ControlLogix chassis to exchange information between these controllers:
• PLC and SLC controllers
• ControlLogix controllers and PLC or SLC controllers
• ControlLogix controllers
In addition to data exchange between controllers, the DH+ network also
provides the ability to regularly share data both plant-wide and at a cellular level.
You can connect a maximum of 32 stations to a single 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.
Figure 9 - ControlLogix DH+ Network Communication Example
SLCâ„¢ 500 Controller
DH+ Network
Data Collection and Recipe
Management
PLC-5 Controller
ControlLogix
Controller
ControlLogix
Controller
DH+ Network
RSView® Station SLC 500 ControllerPLC-5 Controller RSView Station
Workstation
EtherNet/IP Network
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