Rockwell Automation 1770 DH,DHII,DH485 CABLE - Manual (Page 18)

Planning a Data Highway or Data Highway Plus
Cable System
Chapter 2
2-2
If you have a DH network, you must construct it using station connectors
and droplines. If you have a DH+ network, you may use station connectors
and droplines, or daisy chaining to connect the devices on your network.
In this section we explain the functions and specifications of the
components in a DH or DH+ network when it is constructed with station
connectors and droplines. The following components are used to construct
a DH or DH+ network:
trunkline
droplines
station connectors
terminators
Use Figure 2.1 for reference when reading about these components.
Figure 2.1
A DH or DH+ network.
PLC-2
Station
PLC-3
Station
Mini-PLC-2
Station
PLC
Station
Computer
Station
Dropline Dropline Dropline
Dropline Dropline
Station
Connector
and Terminator
Station
Connector
and Terminator
Trunkline
Station Connector
19597
Components of a Network
Constructed with Station
Connectors and Droplines