Rockwell Automation 1794-ID2-B User Manual

Installation Instructions

FLEX I/O 2-Channel Incremental
Encoder Module

Catalog Numbers 1794-ID2 Series B

Table of Contents

Top ic Pa ge

Important User Information 2

Environment and Enclosure 3

Prevent Electrostatic Discharge 3

European Hazardous Location Approval 4

North American Hazardous Location Approval 5

Install the Module 7

Wire the Module 8

Specifications 15

2 FLEX I/O 2-Channel Incremental Encoder Module

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.

) describes some important differences between

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

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.

Publication 1794-IN063C-EN-E - February 2014

Environment and Enclosure

ATTENTION: This equipment is intended for use in a Pollution Degree 2

industrial environment, in overvoltage Category II applications (as defined in
IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.
This equipment is not intended for use in residential environments and may not
provide adequate protection to radio communication services in such
environments.
This equipment is supplied as open-type equipment. It must be mounted within
an enclosure that is suitably designed for those specific environmental
conditions that will be present and appropriately designed to prevent personal
injury resulting from accessibility to live parts. The enclosure must have
suitable flame-retardant properties to prevent or minimize the spread of flame,
complying with a flame spread rating of 5VA or be approved for the application
if nonmetallic. The interior of the enclosure must be accessible only by the use
of a tool. Subsequent sections of this publication may contain additional
information regarding specific enclosure type ratings that are required to
comply with certain product safety certifications.
In addition to this publication, see:

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

• NEMA Standard 250 and IEC 60529, as applicable, for explanations of the
degrees of protection provided by different types of enclosure.

Prevent Electrostatic Discharge

FLEX I/O 2-Channel Incremental Encoder Module 3

, for additional installation requirements.

ATTENTION: 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.

Publication 1794-IN063C-EN-E - February 2014

4 FLEX I/O 2-Channel Incremental Encoder Module

European Hazardous Location Approval

The following module is European Zone 2 approved: 1794-ID2 Series B.

The following applies when the product bears the Ex Marking

European Zone 2 Certification (The following applies when the product bears the Ex Marking)
This equipment is intended for use in potentially explosive atmospheres as defined by European
Union Directive 94/9/EC. DEMKO certifies that this equipment has been found to comply with the
Essential Health and Safety Requirements relating to the design and construction of Category 3
equipment intended for use in Zone 2 potentially explosive atmospheres, given in Annex II to this
Directive.
Compliance with the Essential Health and Safety Requirements has been assured by
compliance with EN 60079-15:2012 and EN 60079-0:2010.

WARNING: Observe the following additional Zone 2 certification
requirements:

• This equipment is not resistant to sunlight or other sources of UV
radiation.

• This equipment must be installed in an enclosure providing at least IP54
protection when applied in Zone 2 environments.

• This equipment shall be used within its specified ratings defined by
Rockwell Automation.

• Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 40% when applied in
Zone 2 environments.

• Secure any external connections that mate to this equipment by using
screws, sliding latches, threaded connectors, or other means provided
with this product.

• Do not disconnect equipment unless power has been removed or the
area is known to be nonhazardous.

Publication 1794-IN063C-EN-E - February 2014

FLEX I/O 2-Channel Incremental Encoder Module 5

North American Hazardous Location Approval

The following module is North American Hazardous Location approved:
1794-ID2 Series B

The following information applies when
operating this equipment in hazardous
locations:

Products marked “CL I, DIV 2, GP A, B, C, D” are suitable
for use in Class I Division 2 Groups A, B, C, D, Hazardous
Locations and nonhazardous locations only. Each product
is supplied with markings on the rating nameplate
indicating the hazardous location temperature code.
When combining products within a system, the most
adverse temperature code (lowest “T” number) may be
used to help determine the overall temperature code of
the system. Combinations of equipment in your system are
subject to investigation by the local Authority Having
Jurisdiction at the time of installation.

WARNING: EXPLOSION HAZARD

• Do not disconnect equipment
unless power has been
removed or the area is known
to be nonhazardous.

• Do not disconnect connections
to this equipment unless
power has been removed or
the area is known to be
nonhazardous. Secure any
external connections that mate
to this equipment by using
screws, sliding latches,
threaded connectors, or other
means provided with this
product.

• Substitution of components
may impair suitability for Class
I, Division 2.

• If this product contains
batteries, they must only be
changed in an area known to
be nonhazardous.

Informations sur l’utilisation de cet
équipement en environnements
dangereux:

Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne
conviennent qu'à une utilisation en environnements
de Classe I Division 2 Groupes A, B, C, D dangereux et
non dangereux. Chaque produit est livré avec des
marquages sur sa plaque d'identification qui
indiquent le code de température pour les
environnements dangereux. Lorsque plusieurs
produits sont combinés dans un système, le code de
température le plus défavorable (code de température
le plus faible) peut être utilisé pour déterminer le
code de température global du système. Les
combinaisons d'équipements dans le système sont
sujettes à inspection par les autorités locales
qualifiées au moment de l'installation.

WARNING: RISQUE
D’EXPLOSION

• Couper le courant ou
s’assurer que
l’environnement est
classé non dangereux
avant de débrancher
l'équipement.

• Couper le courant ou
s'assurer que
l’environnement est
classé non dangereux
avant de débrancher les
connecteurs. Fixer tous
les connecteurs externes
reliés à cet équipement à
l'aide de vis, loquets
coulissants, connecteurs
filetés ou autres moyens
fournis avec ce produit.

• La substitution de
composants peut rendre
cet équipement inadapté
à une utilisation en
environnement de Classe
I, Division 2.

• S’assurer que
l’environnement est
classé non dangereux
avant de changer les
piles.

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6 FLEX I/O 2-Channel Incremental Encoder Module

ATTENTION: Personnel responsible for the application of safety-related

programmable electronic systems (PES) shall be aware of the safety
requirements in the application of the system and shall be trained in using the
system.

ATTENTION: FLEX I/O systems are grounded through the DIN rail to chassis
ground. Use zinc plated yellow-chromate steel DIN rail to assure proper
grounding. The use of other DIN rail materials (for example, aluminum or
plastic) that can corrode, oxidize, or are poor conductors, can result in improper
or intermittent grounding. Secure DIN rail to mounting surface approximately
every 200 mm (7.8 in.) and use end-anchors appropriately.

ATTENTION: Do not remove or replace a Terminal Base unit while power is
applied. Interruption of the backplane can result in unintentional operation or
machine motion.

ATTENTION: For Class I Division 2 applications, use only Class I Division 2
listed or recognized accessories and modules approved for use within the 1794
platform.

ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.

WARNING: When used in a Class I, Division 2, hazardous location, this
equipment must be mounted in a suitable enclosure with proper wiring
method that complies with the governing electrical codes.

WARNING: If you connect or disconnect wiring while the field-side power is
on, an electrical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area is
nonhazardous before proceeding.

Publication 1794-IN063C-EN-E - February 2014