Installing The Dh-485 Network; Dh-485 Communication Cable And Isolated Link Coupler; Installing The Dh-485 Communication Cable - Allen-Bradley SLC 500 User Manual

Installing the DH-485
Network
To install a DH-485 network, you will need tools to strip the shielded
cable and to attach the cable and terminators to the Isolated Link
Coupler.
Install the DH-485 network using the following tools (or equivalent).
Description
Shielded twisted pair cable
Stripping tool
1/8 in. slotted screwdriver

DH-485 Communication Cable and Isolated Link Coupler

The link coupler provides a connection for each node. The isolated
link coupler electrically isolates the DH-485 communication interface
from the processor and peripheral connections. Electrical-optical
isolation is provided to 1500V.
The suggested DH-485 communication cable is Belden #3106A or
#9842 cable. The cable is jacketed and shielded with two twisted wire
pairs and a drain wire.
One pair provides a balanced signal line, and one wire of the other
pair is used for a common reference line between all nodes on the
network. The shield reduces the effect of electrostatic noise from the
industrial environment on the network communication.

Installing the DH-485 Communication Cable

The communication cable consists of a number of cable segments
daisy-chained together. The total length of the cable segments cannot
exceed 1219 m (4000 ft).
When cutting cable segments, make them long enough to route them
from one link coupler to the next with sufficient slack to prevent
Setting Up the DH-485 Network
Part Number Manufacturer
Belden #3106A or #9842 Belden
45-164 Ideal Industries
Not applicable Not applicable
Publication 1747-UM011G-EN-P - June 2008
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