Rockwell Automation 1784-U2DN User Manual

Installation Instructions

USB-to-DeviceNet Cable

Catalog Number 1784-U2DN

Topic Page

Important User Information 2
Environment and Enclosure 3
About the Cable 4
Install the Cable 5
Status Indicators 10
Additional Resources 15

2 USB-to-DeviceNet Cable

Important User Information

Solid-state equipment has operational characteristics differing from those of electromechanical
equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls
(Publication SGI-1.1

http://www.rockwellautomation.com/literature/

solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also
because of the wide variety of uses for solid-state equipment, all persons responsible for applying this
equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the
many variables and requirements associated with any particular installation, Rockwell Automation, Inc.
cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

available from your local Rockwell Automation sales office or online at

WARNING: Identifies information about practices or circumstances that can cause an
explosion in a hazardous environment, which may lead to personal injury or death,
property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to
personal injury or death, property damage, or economic loss. Attentions help you identify
a hazard, avoid a hazard and recognize the consequences.

SHOCK HAZARD: Labels may be on or inside the equipment, for example, drive or motor,
to alert people that dangerous voltage may be present.

) describes some important differences between

BURN HAZARD: Labels may be on or inside the equipment, for example, drive or motor,
to alert people that surfaces may reach dangerous temperatures.

IMPORTANT Identifies information that is critical for successful application and understanding of the

product.

Rockwell Automation Publication 1784-IN046D-EN-P - April 2011

Environment and Enclosure

ATTENTION: This equipment is intended for use in overvoltage

Category II applications (as defined in IEC 60664-1), at altitudes up
to 2000 m (6562 ft) without derating.

This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR 11. Without appropriate precautions, there
may be potential difficulties with electromagnetic compatibility in
residential and other environments due to conducted and radiated
disturbances.

This equipment is supplied as enclosed equipment. It should not
require additional system enclosure when used in locations consistent
with the enclosure type ratings stated in the Specifications section of
this publication. Subsequent sections of this publication may contain
additional information regarding specific enclosure type ratings,
beyond what this product provides, that are required to comply with
certain product safety certifications.

In addition to this publication, see the following:

• Industrial Automation Wiring and Grounding Guidelines, ,
publication 1770-4.1

• NEMA Standard 250 and IEC 60529, as applicable, for
explanations of the degrees of protection provided by enclosures

USB-to-DeviceNet Cable 3

, for additional installation requirements

At the end of its life, this equipment should be collected
separately from any unsorted municipal waste.

Rockwell Automation Publication 1784-IN046D-EN-P - April 2011

4 USB-to-DeviceNet Cable

About the Cable

The 1784-U2DN USB-to-DeviceNet cable lets you connect a computer to a
DeviceNet network via an unused USB port on the computer.

IMPORTANT

To comply with the CE low voltage directive (LVD), this equipment
must be powered from a source compliant with safety extra low
voltage (SELV) or protected extra low voltage (PELV).

The 1784-U2DN cable replaces the 1784-PCD communication card.

USB Cable

Data Rate (DR) Switch

Node Address
Switches

Status Indicators

Five-pin Female DeviceNet
Network Connector

The cable operates at data rates of 125 Kbps, 250 Kbps, and 500 Kbps.

IMPORTANT

The data rate is read only when power is applied. To change the
data rate, you must disconnect the cable from the USB port, use
the data rate switch to change the data rate setting, then
reconnect the cable to the USB port.

Rockwell Automation Publication 1784-IN046D-EN-P - April 2011

USB-to-DeviceNet Cable 5

These are the firmware variations:

• Cables with version 1.009 or later contain a fix for an anomaly whereby

timeouts could be experienced while monitoring parameters of some
devices. The initial installation of a 1784-U2DN USB-to-DeviceNet
cable will no longer cause the Windows operating system to report an
error code 10.

• Cables with version 1.008 or later have an explicit message size of 500

bytes, which allows uploading from a SmartGuard controller.

Install the Cable

Follow these procedures to install the cable.

ATTENTION: Prevent Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can
cause internal damage and affect normal operation. Follow these
guidelines when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• Use a static-safe workstation, if available.

• Store the equipment in appropriate static-safe packaging when

not in use.

ATTENTION: USB connection length must be less than 3 m
(9.84 ft). Do not attempt to extend the cable.

Rockwell Automation Publication 1784-IN046D-EN-P - April 2011