Rockwell Automation 1794-IH16 User Manual
Installation Instructions
FLEX I/O 125V dc Digital Input Module
1794-IH16
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
Automation sales office or online at http://www.literature.rockwellautomation.com) describes
some important differences between 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 we use notes to make you aware of safety considerations.
WARNING
IMPORTANT
ATTENTION
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.
Identifies information that is critical for successful application and understanding
of the product.
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
• recognize the consequence
ATTENTION
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
publication 60664-1), at altitudes up to 2000 meters (6562 ft) without
derating.
This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR Publication 11. Without appropriate precautions,
there may be potential difficulties ensuring electromagnetic compatibility
in other environments due to conducted as well as radiated disturbance.
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, for
additional installation requirements, Allen-Bradley publication
1770-4.1.
• NEMA Standards publication 250 and IEC publication 60529, as
applicable, for explanations of the degrees of protection provided by
different types of enclosure.
SGI-1.1 available from your local Rockwell
ATTENTION
ATTENTION
WARNING
WARNING
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.
Preventing 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.
• If available, use a static-safe workstation.
• Store the equipment in appropriate static-safe packaging when not
in use.
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.
Do not connect directly to line voltage. Line voltage must be supplied by a
suitable, approved isolating transformer or power supply having short circuit
capacity not exceeding 100 VA maximum or equivalent.
North American Hazardous Location Approval
The following modules are North American Hazardous Location approved:
1794-IH16.
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.
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.
Publication 1794-IN118A-EN-P - June 2008
2 FLEX I/O 125V dc Digital Input Module
IMPORTANT
To comply with North American restrictions, all connected I/O must be
powered from a source compliant with the following:
Class 2
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.
Install Your Digital Module
7
3
1
2
4
Description Description
1 Keyswitch 5 Alignment bar
2 Terminal base 6 Groove
3 Flexbus connector 7 Latching mechanism
4 Module
The module mounts on a 1794 t erminal base.
ATTENTION
ATTENTION
1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 1 as
2. Make certain the flexbus connector (3) is pushed all the way to the left to
3. Make sure the pins on the bottom of the module are straight so they will
4. Position the module (4) with its alignment bar (5) aligned with the groove
5. Press firmly and evenly to seat the module in the ter minal base unit. The
Do not remove or replace a Terminal Base unit when power is applied.
Interruption of the backplane can result in unintentional operation or
machine motion.
During mounting of all devices, be sure that all debris (metal chips, wire
strands, etc.) is kept from falling into the module. Debris that falls into the
module could cause damage on power up.
required for this type of module.
connect with the neighboring terminal base/adapter.
You cannot install the module unless the connector is fully extended.
align properly with the connector in the terminal base.
(6) on the terminal base.
module is seated when the latching mechanism (7) is locked into the
module.
5
Connect Wiring for your Module
(using a 1794-TB3 or TB3S)
1. Connect individual input wiring to numbered terminals on the 0-15 row (A)
as indicated in Table 1.
2. Connect the associated input device +V dc to the corresponding terminal
on the 34-51 row (C) for each input as indicated in
input devices, also connect the associated input common lead to the
corresponding terminal on the 16-33 row (B).
3. Connect +V dc power to terminal 34 on the 34-51 row (C).
4. Connect dc common to terminal 16 on the 16-33 row (B).
5. If daisychaining power to the next terminal base, connect a jumper from
terminal 51 (+V dc) on this base unit to terminal 34 on the next base unit.
6. If continuing dc common to the next base unit, connect a jumper from
terminal 33 (common) on this base unit to terminal 16 on the next base
unit.
Table 1 Wiring Connections for 1794-IH16
6
Channel Signal Power Terminal
0 A-0 C-35 B-17
1 A-1 C-36 B-18
2 A-2 C-37 B-19
3 A-3 C-38 B-20
4 A-4 C-39 B-21
5 A-5 C-40 B-22
6 A-6 C-41 B-23
7 A-7 C-42 B-24
8 A-8 C-43 B-25
9 A-9 C-44 B-26
10 A-10 C-45 B-27
11 A-11 C-46 B-28
12 A-12 C-47 B-29
13 A-13 C-48 B-30
14 A-14 C-49 B-31
15 A-15 C-50 B-32
+V DC C-34 thru C-51 are internally conn ected together.
Common B-16 thru B-33 are internally conn ected together.
(1)
2-wire devices use the input and power terminals.
3-wire devices use the input, common and power terminals
1794-TB3 and -TB3S Terminal Base Wiring for 1794-IH16
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
-V
Common
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Volt ag e
In +V
Connect V dc common to terminal B-16
Connect +V dc power to terminal C-34
(Use B-33 and C-51 for daisy-chaining to next terminal base unit)
Inputs
Commons
Voltage
2 and 3-Wire Input Wiring for 1794-IH16
0 -15
16-33
34-51
A
B
C
A
B
C
= Sink Input
= Common
= 24V dc
0
16
34
01 0 1
2-Wire Device
(Sourcing Output)
Table 1. If using 3-wire
Common Terminal
A
B
-V
Common
C
Volt ag e
Out +V
(1794-TB3 shown)
3-Wire Device
(Sourcing Output)
(1)
Publication 1794-IN118A-EN-P - June 2008
IMPORTANT
To comply with the CE Low Voltage Directive (LVD), all connected I/O must
be powered from a source compliant with the following: Safety Extra Low
Voltage (SELV) or Protected Extra Low Voltage (PELV).
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