Rockwell Automation DeviceNet Media Design Installation Guide - Manual (Page 20)

Publication DNET-UM072C-EN-P - July 2004
1-10 Get Started
About direct connection
Connect devices directly to the trunk line only if you can later remove the devices
without disturbing communications on the cable system.This is called a
“zero-length” drop, because it adds nothing (zero) when calculating cumulative
drop line length.
About connectors
Connectors attach cables to devices or other components of the DeviceNet
cable system. Field-installable connections are made with either sealed or open
connectors.
IMPORTANT
If a device provides only fixed-terminal blocks for its
connection, you must connect it to the cable system by a
drop line. Doing this allows you to remove the device at the
tap without disturbing communications on the trunk line of
the cable system.
Connector Description
Sealed
Mini-style: Attaches to taps and thick and thin cable.
Micro-style: Attaches to thin cable only - has a reduced
current rating.
Open Plug-in: Cable wires attach to a removable connector.
Fixed: Cable wires attach directly to non-removable screw
terminals (or equivalent) on device.
Wire
Color Wire
Identity Usage
Round Usage
Flat
white CAN_H signal signal
blue CAN_L signal signal
bare drain shield n/a
black V- power power
red V+ power power
device with
removable
open-style
connector
41839
device with
fixed, open-style
connector
41674