Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 21)

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 21
Chapter
2
Using the Data Highway Plus Network
This chapter describes the basics of Data Highway Plus (DH+) and the
operation of a DH+ network.
What Is Data Highway Plus? On the most basic level, Data Highway Plus is a wire or cable and a protocol that
connects computers and peripheral devices so that they can communicate. The
wire used for a network is called the network medium.
A DH+ link transfers data between ControlLogix controllers, PLC and SLC
controllers, and other devices that use the DH+ network. These devices are
called stations. You can connect a maximum of 32 stations to one DH+ link.
Topic Page
What Is Data Highway Plus? 21
Connect Devices to the DH+ Network 23
Two Methods of Communication Over a DH+ Network 25
Use DH+ Messaging 25
Configuration Information in DH+ Messaging 32
Application Timeout 33
Example DH+ Routing Configuration 34
Use Control and Information Protocol (CIP) Messaging 35