Publication 1756-UM514B-EN-P - February 2003
2-2 Using the Data Highway Plus Network
Link Design
When you design your DH+ link, you should use good design
practices, including laying out the link before installation. We also
recommend you consider the following when designing your
DH+
link:
· All perfomance requirements
· Maintenance
· Possible future changes to the link
Use 1770-CD (Belden 9463) cable to connect your module to DH+.
Connect a DH+ network using a daisy chain or trunk line/drop line
configuration.
Trunk Line/Drop Line Considerations
When using a trunk line/drop line configuration, use 1770-SC station
connectors and follow these cable-length guidelines:
· trunk line-cable length - depends on the communication rate of
the link
· drop-cable length - 30.4 m (100 cable-ft.)
For more information about designing trunk line/drop line
configurations, see the Data Highway/Data Highway Plus/Data
Highway II/ Data Highway-485 Cable Installation Manual, publication
1770-6.2.2.
Verify that your system’s design plans specify cable lengths within
allowable measurements.
IMPORTANT
The maximum cable length for DH+ depends on the
transmission rate. Configure all devices on a DH+
link to communicate at the same transmission rate.
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