Rockwell Automation 1794-IF4ICFXT User Manual

Installation Instructions

FLEX XT I/O Isolated Input Analog Module

Cat. No. 1794-IF4ICFXT

Important User Information

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

SGI-1.1 available from your local Rockwell Automation sales office or online at
http://literature.rockwellautomation.com) describes some important differences between solid state

equipment and hard-wired electromechanical d evices. Because of this difference, and also because of the
wide variety of uses for solid state equip ment, all persons responsible for applying thi s equipment must
satisfy themselves that each intended application of t his 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 t his equipment.

The examples and diagrams in this manual are i ncluded solely for illustrative purposes. Because of the many
variables and requirements associated wit h 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 informa tion, 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 we use notes to make you aware of safety considerations.

WARNING

ATTENTION

IMPORTANT

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

Identifies information about prac tices or circumstances that can lead to personal
injury or death, property damage, or econom ic loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Identifies information that is critical fo r successful application and understanding of
the product.

WARNING

ATTENTION

ATTENTION

ATTENTION

ATTENTION

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.

FLEX I/O is 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.

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.

Do not substitute a 1794-IF4I or 1794-IF4IXT with the 1794-IF4ICFXT, as this
will force a remapping of IO and configuration data.

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

WARNING

Environment and Enclosure

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 considered Group 1, Class A industrial equipment according
to IEC/CISPR 11. Without appropriate precautions, there may be difficulties
with electromagnetic compatibility in residential and other environments due
to conducted and radiated disturbances.
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, V2, V1, V0 (or equivalent) if
non-metallic. 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,
requirements.

• NEMA Standard 250 and IEC 60529, as applicable, for explanations of

the degrees of protection provided by different types of enclosure.

If you insert or remove the module while backplane 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.

for additional installation

ATTENTION

To comply with the CE Low Voltage Directive (LVD), all connections to this
equipment must be powered from a source compliant with the following:

Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).

ATTENTION

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.

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.

European Hazardous Location Approval

European Zone 2 Certification (The following applies when the product bears the Ex
or EEx Marking)

This equipment is intended for use in potentially explosive atmospheres as defined by European
Union Directive 94/9/EC and 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 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 and EN 60079-0.

Publication 1794-IN130A-EN-P - December 2009

2

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

Allen-Bradley.

• 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.

North American Hazardous Location Approval

The following adapters are North American Hazardous Location approved:
1794-IF4ICFXT

The following information applies when operating this
equipment in hazardou s 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 dangere ux :

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.

AVERTISSEMENT

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.

About the module

In addition to the features supported by the 1794-IF4I and 1794-IF4IXT
modules, the 1794-IF4ICFXT features three additional parameters that allow
additional control over the way the analog signals are processed by the
module. The settings are at the module level.

Settings to these parameters affect all inputs set to 150 Hz, 300 Hz, or

Hz. The parameters do not affect channels set at 1200 Hz.

600

Install Your Analog Input Module

7

3

1

ATTENTION

During mounting of all devices, be sure that all debris (such as metal chips, or
wire strands) is kept from falling into the module. Debris that falls into the
module could cause damage on
power up.

Keep a minimum of 25 mm (1 in.) of space on the top and bottom of the
module, for adequate ventilation between equipment.

The module mounts on a 1794 terminal base.

1. Rotate the keyswitch (1) on the terminal base (2) clockwise to

position 3 as required for 1794-IF4ICFXT.

2. Make certain the flexbus connector (3) is pushed all the way to the

left to connect with the neighboring terminal base/adapter.

You cannot install the module unless the connector is fully
extended.

3. Make sure the pins on the bottom of the module are straight so

they will align properly with the connector in the terminal base.

4. Position the module (4) with its alignment bar (5) aligned with the

groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base

unit. The module is seated when the latching mechanism (7) is
locked into the module.

Connect Wiring for Analog Inputs and Outputs

1. 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS -

Connect individual input/output wiring to numbered terminals on
the 0-15 row (A) as indicated in the Wire Connections table.

Use Belden 8761 cable for signal wiring.
1794-TBN - Connect individual input/output wiring to even
numbered terminals on the 16-33 row (B) as indicated in the
following table.
Use Belden 8761 cable for signal wiring.

ATTENTION

2. 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS - Connect each channel

3. Connect any signal wiring shields to functional ground as near as

4. Connect the +V DC power to terminal 34 on the 34-51 row (C) and

ATTENTION

Connect only one current or one voltage signal per channel. Do not connect
both current and voltage on one channel.

signal return to numbered terminals on 0-15 row (A) as indicated
in the following table. Use Belden 8761 cable for signal wiring.
1794-TBN - Connect each channel signal return to odd numbered
terminals on row (C) as indicated in the following table.

possible to the module.
1794-TB3T or -TB3TS only: Connect cable shield to terminate

C-39 through C-46 (earth ground).

-V common/return to terminal 16 on the B row.

To reduce susceptibility to noise, power analog modules and digital modules
from separate power supplies.

4

Publication 1794-IN130A-EN-P - December 2009

2

5. If daisychaining +V power to the next terminal base, connect a

6

5

jumper from terminal 51 (+V DC) on this base unit to terminal 34
on the next base unit.

6. If continuing DC common (-V) to the next base unit, connect a

jumper from terminal 33 (common) on this base unit to terminal 16
on the next base unit.