Allen-Bradley 1794-IB8 User manual

Installation Instructions
FLEX I/O Digital Input Modules
Catalog numbers 1794-IB8, 1794-IB16, 1794-IB32
Table of Contents
Topic Page
Important User Information 2
Environment and Enclosure 3
Prevent Electrostatic Discharge 3
European Hazardous Location Approval 4
North American Hazardous Location Approval 6
Install Your Digital Input Module 8
Configure Your Input Module 14
Specifications 17

2FLEX I/O Digital Input Modules
Publication 1794-IN093E-EN-P - August 2018
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 available from your local Rockwell Automation Sales Office or online at
http://www.rockwellautomation.com/literature/) 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, when necessary, we use notes to make you aware of safety considerations.
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.
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.

FLEX I/O Digital Input Modules 3
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Environment and Enclosure
Prevent Electrostatic Discharge
ATTENTION: This equipment is intended for use in a Pollution Degree 2
industrial environment, in overvoltage Category II applications (as defined in
EN/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 for indoor use. 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 more
information regarding specific enclosure type ratings 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, for more installation requirements.
• NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of
the degrees of protection provided by enclosures.
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.

4FLEX I/O Digital Input Modules
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European Hazardous Location Approval
The following modules are European Zone 2 approved: 1794-IB8, 1794-IB16.
The following applies to products marked II 3 G:
• Are intended for use in potentially explosive atmospheres as defined by European
Union Directive 2014/34/EU 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 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 and EN 60079-0.
• Are Equipment Group II, Equipment Category 3, and comply with the Essential Health
and Safety Requirements relating to the design and construction of such equipment
given in Annex II to EU Directive 2014/34/EU. See the EU Declaration of Conformity at
http://www.rockwellautomation.com/global/certification/overview.page for details.
• The type of protection is Ex nA IIC T3 Gc (1794-IB8) and Ex nA IIC T4 Gc (1794-IB16)
according to EN 60079-15.
• Comply to Standards EN 60079-0:2012, EN 60079-15:2010, reference certificate
number LCIE 01 ATEX 6020 X (1794-IB8) and DEMKO 14 ATEX 1342501X (1794-IB16).
• Are intended for use in areas in which explosive atmospheres caused by gases,
vapors, mists, or air are unlikely to occur, or are likely to occur only infrequently and
for short periods. Such locations correspond to Zone 2 classification according to
ATEX directive 2014/34/EU.

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WARNING: Special Conditions for Safe Use:
• This equipment is not resistant to sunlight or other sources of UV radiation.
• This equipment shall be mounted in an ATEX/IECEx Zone 2 certified
enclosure with a minimum ingress protection rating of at least IP54 (in
accordance with EN/IEC 60079-15) and used in an environment of not more
than Pollution Degree 2 (as defined in EN/IEC 60664-1) when applied in
Zone 2 environments. The enclosure must be accessible only by the use of
a tool.
• 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 140% of the peak rated voltage
when applied in Zone 2 environments.
• The instructions in the user manual shall be observed.
• This equipment must be used only with ATEX certified Rockwell
Automation backplanes.
• Earthing is accomplished through mounting of modules on rail.
• Devices shall be used in an environment of not more than Pollution
Degree 2.
WARNING: Secure any external connections that mate to this equipment by
using screws, sliding latches, threaded connectors, or other means provided
with this product.
WARNING: Do not disconnect equipment unless power has been removed or
the area is known to be nonhazardous.
WARNING: When you insert or remove the module while backplane power is
on, an electric 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.
Repeated electric arcing causes excessive wear to contacts on both the module
and its mating connector. Worn contacts may create electrical resistance that
can affect module operation.

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North American Hazardous Location Approval
The following modules are North American Hazardous Location approved: 1794-IB8,
1794-IB16, 1794-IB32.
The following information applies when
operating this equipment in hazardous
locations:
Informations sur l’utilisation de cet équipement
en environnements dangereux:
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.
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.
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.
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.

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ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
ATTENTION: Read this document and the documents listed in the Additional
Resources section about installation, configuration, and operation of this
equipment before you install, configure, operate, or maintain this product. Users
are required to familiarize themselves with installation and wiring instructions
in addition to requirements of all applicable codes, laws, and standards.
ATTENTION: Installation, adjustments, putting into service, use, assembly,
disassembly, and maintenance are required to be carried out by suitably trained
personnel in accordance with applicable code of practice.
ATTENTION: In case of malfunction or damage, no attempts at repair should be
made. The module should be returned to the manufacturer for repair. Do not
dismantle the module.
ATTENTION: This equipment is certified for use only within the surrounding air
temperature range of -20…+55 °C (-4…+131 °F) (1794-IB8 and 1794-IB16) or
0...50 °C (32…131 °F) (1794-IB32). The equipment must not be used outside of
this range.
ATTENTION: Use only a soft dry anti-static cloth to wipe down equipment. Do
not use any cleaning agents.
ATTENTION: This product is grounded through the DIN rail to chassis ground.
Use zinc plated chromate-passivated 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. Be sure to ground the DIN rail
properly. Refer to Industrial Automation Wiring and Grounding Guidelines,
Rockwell Automation publication 1770-4.1, for more information.
ATTENTION: To comply with the CE Low Voltage Directive (LVD), this
equipment 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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Install Your Digital Input Module
Compatibility
The following communication adapters are required to ensure compatibility with
the 1794-IB32:
Remote I/O 1794-ASB series E or later
1794-ASB2 series D or later
ControlNet 1794-ACN15 series C, firmware revision 4.1 or later
1794-ACNR15 series C, firmware revision 4.1 or later
DeviceNet 1794-ADN Series B, firmware revision 2.4 or greater for
out-of-box compatibility
Ethernet 1794-AENT series A, firmware revision 2.4 or later
PROFIBUS 1794-APB series A, version 1.1 of the GSD file
(You can download the GSD file at www.ab.com/networks/gsd.)
ControlLogix® Family RSLogix 5000® programming software, version 11 or later
Description Description
1 FlexBus connectors 5 Groove
2 Latching mechanism 6 Alignment bar
3 Keyswitch
7 Module
4 Terminal base
6
1
7
5
4
3
2
45284

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The module mounts on a 1794 terminal base.
1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 2 as
required for this type of module.
2. Make sure the FlexBus connector (1) 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 (7) with its alignment bar (6) aligned with the groove (5) 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 (2) is locked into the module.
Connect Wiring for the 1794-IB8 and 1794-IB16 using a 1794-TB3 or
1794-TB3S
1. Connect individual input wiring to numbered terminals on the 0…15 row (A) as
indicated in the Wiring Connections for 1794-IB8 and 1794-IB16 table.
2. Connect the associated +V DC power lead of the input device to the
corresponding terminal on the 34…51 row (C) for each input as indicated in the
Wiring Connections for 1794-IB8 and 1794-IB16 table. (The +V power
terminals of row (C) are internally connected together.)
3. Connect the associated input common (3-wire devices only) to the
corresponding terminal on the 16…33 row (B) for each input as indicated in the
Wiring Connections for 1794-IB8 and 1794-IB16 table. (Commons are
internally connected together.)
ATTENTION: 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.
WARNING: 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.

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4. Connect +V DC power to terminal 34 on the 34…51 row (C).
5. Connect DC common to terminal 16 on the 16…33 row (B).
6. 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.
7. 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.
Wiring Connections for 1794-IB8 and 1794-IB16
(use with 1794-TB3 or 1794-TB3S Terminal Base Unit)
Input(1)
(1) 1794-IB8: Inputs 0…7; 1794-IB16: Inputs 0…15.
Input Terminal Voltage Terminal Common Terminal(2)
(2) 3-wire devices use signal, supply and common. 2-wire devices use signal and supply
Input 0 A-0 C-35 B-17
Input 1 A-1 C-36 B-18
Input 2 A-2 C-37 B-19
Input 3 A-3 C-38 B-20
Input 4 A-4 C-39 B-21
Input 5 A-5 C-40 B-22
Input 6 A-6 C-41 B-23
Input 7 A-7 C-42 B-24
Input 8 A-8 C-43 B-25
Input 9 A-9 C-44 B-26
Input 10 A-10 C-45 B-27
Input 11 A-11 C-46 B-28
Input 12 A-12 C-47 B-29
Input 13 A-13 C-48 B-30
Input 14 A-14 C-49 B-31
Input 15 A-15 C-50 B-32
+V DC C-34...C-51
Common B-16...B-33

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1794-TB3 and 1794-TB3S Terminal Base Wiring for 1794-IB8 and 1794-IB16
2-Wire and 3-Wire Input Wiring for 1794-IB8 and 1795-IB16
-V
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
34
Inputs
Commons
(1794-TB3 shown)
Connect V common to terminal B-16.
Connect +V to terminal C-34.
Voltage
In +V
Voltage
Out +V
Voltage
A
B
C
Common
-V
Common
Use B-33 and C-51 to daisy-chain to the next terminal base unit.
= Sink input
= Common
= +V DC
0…15
16…33
34…51
A
B
C
A
B
C
2-Wire Device
(Sourcing Output)
3-Wire Device
(Sourcing Output)

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Connect Wiring for the 1794-IB32 using a 1794-TB32 or 1794-TB32S
1. Connect individual input wiring (IN0…IN15) to numbered terminals on the 0…15
row (A) as indicated in the Wiring Connections for 1794-IB32 table.
2. Connect the associated power to the +V1 terminal (35, 37, 39, or 41) on the
34…51 row (C) as indicated in the Wiring Connections for 1794-IB32 table.
3. Connect the associated common for IN0…IN15 to COM1 (terminal 36, 38, 40,
or 42) on the 34…51 row (C) as indicated in the Wiring Connections for
1794-IB32 table.
4. Connect individual input wiring (IN16…IN31) to numbered terminals on the
16…33 row (B) as indicated in the Wiring Connections for 1794-IB32 table. Do
not connect to terminals 16 or 33.
5. Connect the associated power to the +V2 terminal (43, 45, 47, or 49) on the
34…51 row (C) as indicated in the Wiring Connections for 1794-IB32 table.
6. Connect the associated common for IN16…IN31 to COM2 (terminal 44, 46,
48, or 50) on the 34…51 row (C).
7. If continuing input wiring power for IN0…IN15 to the next terminal base,
connect a jumper from terminal 41 (+V1) on this terminal base unit to the power
terminal on the next terminal base unit. (Refer to the installation instructions for
the specific terminal base unit.
8. If continuing input wiring IN0…IN15 common to the next terminal base,
connect a jumper from terminal 42 (COM1) on this terminal base unit to the
common terminal on the next terminal base unit.
9. If continuing input wiring power for IN16…IN31 to the next terminal base,
connect a jumper from terminal 49 (+V2) on this terminal base unit to the power
terminal on the next terminal base unit. (Refer to the installation instructions for
the specific terminal base unit.
10. If continuing input wiring IN16…IN31 common to the next terminal base,
connect a jumper from terminal 50 (COM2) on this terminal base unit to the
common terminal on the next terminal base unit.
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.

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Wiring Connections for 1794-IB32
(use with 1794-TB32 or 1794-TB32S Terminal Base Unit)
Input(1)
(1) 3-wire devices use signal, return and supply. 2-wire devices use signal and supply
Signal Input Signal
IN 0 A-0 IN 16 B-17
IN 1 A-1 IN 17 B-18
IN 2 A-2 IN 18 B-19
IN 3 A-3 IN 19 B-20
IN 4 A-4 IN 20 B-21
IN 5 A-5 IN 21 B-22
IN 6 A-6 IN 22 B-23
IN 7 A-7 IN 23 B-24
IN 8 A-8 IN 24 B-25
IN 9 A-9 IN 25 B-26
IN 10 A-10 IN 26 B-27
IN 11 A-11 IN 27 B-28
IN 12 A-12 IN 28 B-29
IN 13 A-13 IN 29 B-30
IN 14 A-14 IN 30 B-31
IN 15 A-15 IN 31 B-32
+V1 DC power
(inputs IN0…IN15) Power terminals 35, 37, 39, and 41 for IN0…IN15. +V1 connected to terminals 35, 37, 39, and 41.
COM1 DC Return
(inputs IN0…IN15) Common terminals 36, 38, 40, and 42 for IN0…IN15. V1 Return connected to terminals 36, 38, 40, and 42.
+V2 DC power
(inputs IN16…IN31) Power terminals 43, 45, 47, and 49 for IN16…IN31. +V2 connected to terminals 43, 45, 47, and 49.
COM2 DC Return
(inputs IN16…IN31) Common terminals 44, 46, 48, and 50 for IN16…IN31. V2 Return connected to terminals 44, 46, 48, and 50.

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1794-TB32 and 1794-TB32S Terminal Base Wiring for 1794-IB32
Configure Your Input Module
Configure your input module by setting bits in the configuration word (write word).
Image Table Memory Map for the 1794-IB8 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read 1 Not used I7 I6 I5 I4 I3 I2 I1 I0
Write 1 Not used Input Filter 0...7
Where I = Input
Image Table Memory Map for the 1794-IB16 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read1 I15I14I13I12I11I10I9I8I7I6I5I4I3I2I1I0
+V1 COM1
17 1819 20 21 22 2324 25 26 27 2829 30 31 32 33
0 1 2 34 5 6 7 89 10 11 12 1314 15
16
35 36 37 38 39 40 41 42 4344 45 46 47 4849 50 51
34
NC
+V2 = Terminals 43, 45, 47, and 49
Inputs
+V1 COM1 +V1 COM1 +V1 COM1 +V2 COM2 +V2 COM2 +V2 COM2 +V2 COM2 NC
+V1 = Terminals 35, 37, 39, and 41
COM1 = Terminals 36, 38, 40, and 42
NC = No connections (terminals 16, 33, 34, and 51)
COM2 = Terminals 44, 46, 48, and 50
NC NC
(1794-TB32 shown)
Inputs

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Set the Input Filter Time
To set the input filter time, set the associated bits in the output image table
(complementary word) for the module.
Read 2 C = Counter Input value of input 15
Write 1 Not used CF CR Input Filter 12...15 Input Filter 0...11
Where
Note:
I = Input
C = Counter value for input 15
CF = Counter fast – where 1 = fast input (raw data), 0 standard input filtered data
CR = Counter reset
C, CR, and CF not available when used with any series 1794-ASB or 1794-ASB2 remote I/O adapter modules.
Image Table Memory Map for the 1794-IB32 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read1 I15I14I13I12I11I10I9I8I7I6I5I4I3I2I1I0
Read 2 I31 I30 I29 I28 I27 I26 I25 I24 I23 I22 I21 I20 I19 I18 I17 I16
Write 1 Not used Input Filter FT
0...31 Not used
Where I = Input status
FT = Input filter time
Image Table Memory Map for the 1794-IB16 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FT = 0…7 (1794-IB8)
FT = 0…11 (1794-IB16)
1794-IB16
O:010
Dec.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Oct.
FT = 12…15
FT = 0…31
1794-IB32

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For example, to increase the off-to-on filter time to 4 ms for all inputs at address rack 1,
module group 0, (using 1794-IB32 as an example), set bits and program as shown below.
Refer to the Input Filter Time table for other bit settings.
Input Filter Time
Bits Description Filter Time
02 01 00 Filter Time for inputs 0...7 (1794-IB8) 1794-IB8, 1794-IB16,
1794-IB32
02 01 00 Filter Time for inputs 0...11 (1794-IB16)
05 04 03 Filter Time for inputs 12...15 (1794-IB16)
10 09 08 Filter Time for inputs 0...32 (1794-IB32) Off to On/On to Off
0 0 0 Filter Time 0 (Default) 0.25 ms
0 0 1 Filter Time 1 0.5 ms
0 1 0 Filter Time 2 1 ms
0 1 1 Filter Time 3 2 ms
1 0 1 Filter Time 4 4 ms
1 0 1 Filter Time 5 8 ms
1 1 0 Filter Time 6 16 ms
1 1 1 Filter Time 7 32 ms
100
76543
FLL
I:000
00
Fill File
Source
Destination
Length
#O:010
1
Write FT to complement
of input module.
Write filter time on system startup.
765432 1 0
0
10= 4 Octal or 4 Decimal
21 0
= 44 Octal or 36 Decimal
010100
1794-IB8
1794-IB16
100 = 4 Octal or 4 Decimal
10 0
1794-IB32
09 08101112131415

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Specifications
Specifications – 1794-IB8
Attribute Value
Number of inputs 8, current, sinking
Recommended terminal base unit 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBKD,
1794-TB37DS
On-state voltage, min 10V DC
On-state voltage, nom 24V DC
On-state voltage, max 31.2V DC
On-state current, min 2.0 mA
On-state current, nom 8.0 mA
On-state current, max 12.0 mA
Off-state voltage, max 5.0V DC
Off-state current, max 1.5 mA
Nominal input impedance 4.6 kΩ
Isolation voltage 50V (continuous), Basic Insulation Type
Type tested @ 850V DC for 60 s, between field side and system
No isolation between individual channels
FlexBus current 20 mA @ 5V DC
Power dissipation, max 3.5 W @ 31.2V DC
Thermal dissipation, max 11.9 BTU/hr @ 31.2V DC
Specifications – 1794-IB16
Attribute Value
Number of inputs 16, current, sinking
Recommended terminal base unit 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBKD,
1794-TB37DS
On-state voltage, min 10V DC
On-state voltage, nom 24V DC
On-state voltage, max 31.2V DC
On-state current, min 2.0 mA
On-state current, nom 8.0 mA

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On-state current, max 12.0 mA
Off-state voltage, max 5.0V DC
Off-state current, max 1.5 mA
Nominal input impedance 4.6 kΩ
Isolation voltage 50V (continuous), Basic Insulation Type
Type tested @ 707V DC for 60 s, between field side and system
No isolation between individual channels
FlexBus current 30 mA @ 5V DC
Power dissipation, max 6.1 W @ 31.2V DC
Thermal dissipation, max 20.8 BTU/hr @ 31.2V DC
Specifications – 1794-IB32
Attribute Value
Number of inputs 32, current, sinking
Recommended terminal base unit 1794-TB32, 1794-TB32S, 1794-TB62DS, 1794-TB62EXD4X15
On-state voltage, min 19.2V DC
On-state voltage, nom 24V DC
On-state voltage, max 31.2V DC
On-state current, min 2.0 mA
On-state current, nom 4.1 mA @ 24V DC
On-state current, max 6.0 mA
Off-state voltage, max 5.0V DC
Off-state current, max 1.5 mA
Nominal input impedance 22.2 kΩ
Isolation voltage 50V (continuous), Basic Insulation Type
Type tested @ 2121V DC for 2 s, between field side and system
No isolation between individual channels
FlexBus current 25 mA @ 5V DC
Power dissipation, max 6.0 W @ 31.2V DC
Thermal dissipation, max 20.47 BTU/hr @ 31.2V DC
Specifications – 1794-IB16
Attribute Value

FLEX I/O Digital Input Modules 19
Publication 1794-IN093E-EN-P - August 2018
General Specifications
Attribute Value
Input filter time Refer to Input Filter Time table
Terminal base screw torque Determined by installed terminal base
Dimensions, approx. (H x W x D) 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.)
Weight, approx. 71 g (2.50 oz.) – 1794-IB8
74 g (2.61 oz.) – 1794-IB16
79 g (2.79 oz.) – 1794-IB32
Indicators (field side indication) 8 yellow status indicators – 1794-IB8
16 yellow status indicators – 1794-IB16
32 yellow status indicators – 1794-IB32
External DC power supply voltage, nom 24V DC
External DC power voltage range 10...31.2V DC (includes 5% AC ripple) – 1794-IB8, 1794-IB16
19.2...31.2V DC (includes 5% AC ripple) – 1794-IB32
North American temperature code T3C – 1794-IB8, 1794-IB32
T4A – 1794-IB16
IEC temperature code T3 – 1794-IB8 only
T4 – 1794-IB16 only
Keyswitch position 2
Enclosure type rating None (open-style)
Wire size Determined by installed terminal base
Wiring category(1) (2) 2 – on signal ports
(1) Use this Conductor Category information for planning conductor routing. Refer to Industrial Automation Wiring and
Grounding Guidelines, publication 1770-4.1.
(2) Use this Conductor Category information for planning conductor routing as described in the appropriate System Level
Installation Manual.
At the end of its life, this equipment should be collected separately from any
unsorted municipal waste.

20 FLEX I/O Digital Input Modules
Publication 1794-IN093E-EN-P - August 2018
Environmental Specifications
Attribute Value
Temperature, operating IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
-20…55 °C (-4…131 °C) – 1794-IB8, 1794-IB16
0…55 °C (32…131 °F) – 1794-IB32
Temperature, surrounding air,
max. 55 °C (131 °F)
Temperature, nonoperating IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),
IEC 60068-2-2 (Test Bb, Unpackaged Nonoperating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Nonoperating Thermal Shock):
-40…85 °C (-40…185 °F)
Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% non-condensing
Vibration IEC60068-2-6 (Test Fc, Operating):
5 g @ 10...500 Hz
Shock, operating IEC60068-2-27 (Test Ea, Unpackaged shock):
30 g
Shock, nonoperating IEC60068-2-27 (Test Ea, Unpackaged shock):
50 g
Emissions IEC 61000-6-4
ESD immunity IEC 61000-4-2:
6 kV contact discharges
8 kV air discharges
Radiated RF immunity IEC 61000-4-3:
(1794-IB8, 1794-IB16)
10V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz
3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
(1794-IB32)
10V/m with 1 kHz sine-wave 80% AM from 80...1000 MHz
EFT/B immunity IEC 61000-4-4:
±2 kV @ 5 kHz on power ports
±2 kV @ 5 kHz on signal ports
Surge transient immunity IEC 61000-4-5:
±1 kV line-line(DM) and ±2 kV line-earth(CM) on signal ports
Conducted RF immunity IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz