Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 72)

Chapter
4
4-1
Data Highway II Overview
Read this chapter for information on:
the DH II cable system
how nodes communicate on DH II
communication between networks
communication with synchronous and asynchronous devices
related products and publications
The Allen-Bradley Data Highway II system is a Local Area Network (LAN).
It connects programmable controllers, computers, and other devices so they can
communicate and exchange data with one another. Cables are the physical
means of transmitting this data between nodes. On a DH II network, a node is
a hardware interface.
Chapter Overview
The DH II Cable System