Installation Instructions
FLEX I/O 5V dc TTL Digital Input and
Output Modules
1794-IG16, 1794-OG16
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-IG16, 1794-OG16.
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-IN119A-EN-P - June 2008
2 FLEX I/O 5V dc TTL Digital Input and Output Modules
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
3
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 terminal base.
ATTENTION
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.
Connect Wiring for your Module
(using a 1794-TB3 or -TB3S Terminal Base)
1. Connect individual input or output wiring to numbered terminals on the
0-15 row (A) as indicated in Ta ble 1.
2. Connect the associated input and output devices as indicated in the wiring
diagrams.
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.
7
1
2
6
5
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-IG16 and 1794-OG16
Channel Signal Power Terminal Common 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.
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.
1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 1 as
required for this type of module.
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 ter minal base unit. The
module is seated when the latching mechanism (7) is locked into the
module.
1794-TB3 and 1794-TB3S Wiring for 1794-IG16
+
I/O wire
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
5
V
+
d
c
p
-
o
w
e
r
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
-V
DC power
Common
wire
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Voltage
In +V
Use Belden 8761, or equivalent, shielded wire.
*
Capacitors shown must be 0.01µF and rated for 2000 Volts (minimum).
I/O cable length must be less than 10 meters.
I/O wire
Capacitor
*
0.01
Inputs
Commons
Voltage
TTL input device
-
µ
F typical
1794-TB3 and 1794-TB3S Wiring for 1794-OG16
+
I/O wire
L
TTL
-
output
device
0.01
5
V
d
c
p
o
w
e
r
+
-
Capacitor
µ
F typical
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
DC power
Common
wire
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Volt ag e
In +V
Use Belden 8761, or equivalent, shielded wire.
*
Capacitors shown must be 0.01µF and rated for 2000 Volts (minimum).
I/O cable length must be less than 10 meters.
Outputs
Commons
Voltage
A
B
-V
Common
Voltage
Out +V
(1794-TB3 shown)
A
-V
Common
(1794-TB3 shown)
C
B
Volt ag e
Out +V
C
Publication 1794-IN119A-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).
Ground Your Module
Use shielded communication cable (Belden #8761). The Belden cable has two signal
wires (black and clear), one drain wire, and a foil shield. The drain wire and foil
shield must be grounded at one end of the cable.
Foil Shield
Black Wire
Insulation
Drain Wire
Clear Wire
IMPORTANT
Do not ground the drain wire and foil shield at both ends of the cable.
Configure Your Input Module
You configure your input module by setting bits in the configuration word (word 3).
Dec 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Oct 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Read I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0
Write Not used = Set to 0 Input filter FT1
Where I = Input
FT0 = Input filter time for inputs 0-11
FT1 = Input filter time for inputs 12-15
12-15
Input filter FT0
0-11
Set the Input Filter Time for the 1794-IG16
To set the input filter time, set the associated bits in the output image
(complementary word) for the module.
15 14 13 12 11 10
09 08 07 06 05 04 03 02 01
00
Dec.
O:010
FT = 12 thru 15 FT = 00 thru 11
Input Filter Times
Bits Description Selected Filter Time
02 01 00 Filter Time for inputs 00...11
05 04 03 Filter Time for inputs 12...15
0 0 0 Filter Time 0 (Default) 0.25ms
0 0 1 Filter Time 1 0.50ms
0 1 0 Filter Time 2 1ms
0 1 1 Filter Time 3 2ms
1 0 0 Filter Time 4 4ms
1 0 1 Filter Time 5 8ms
1 1 0 Filter Time 6 16ms
1 1 1 Filter Time 7 32ms
Configure Your Output Module
You configure your output module by setting bits in word 1.
Dec 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Oct 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Read Not used - Set to 0
Write O15 014 013 012 011 010 O9 O8 O7 O6 O5 O4 O3 O2 O1 O0
Where O = Output
FLEX I/O 5V dc TTL Digital Input and Output Modules 3
Specifications - 1794-IG16 Flex I/O 5V dc TTL Digital Input Module
Specification Description
Number of I/O channels 16, nonisolated
Module location Cat. No. 1794-TB3, -TB3S
On-state voltage -0.2V dc...0.8V dc typical
Input current 3.7mA nominal @ 5V dc
Off-state voltage 2.0...5.5V dc typical
Off-state current 4.1mA maximum
Input impedance 1.4K ohms minimum
Isolation voltage 50V (continuous), Basic Insulation Type, between field side and syste m
Flexbus current 40mA
Power dissipation 1.4W maximum @ 5.5V dc
Thermal dissipation 4.78 BTU/hr @ 5.5V dc
Indicators (field side indication,
customer device driven)
Input filter time
(1)
(1)
Off to On
On to Off
Input off-to-on filter time is the time from a valid input signal to recognition by the module.
Input on-to-off filter t ime is time from the input signal dropping below the valid level to recognition by the module.
IMPORTANT
TTL inputs are inverted
(-0.2…0.8V dc=logic low voltage=1=on
2.0…5.5V dc=logic high voltage=0=off).
Use a NOT instruction in the ladder program to convert to traditional
true=High logic.
Specifications - 1794-OG16 Flex I/O 5V dc TTL Digital Output Module
Specification Description
Number of I/O channels 16, nonisolated
Module location Cat. No. 1794-TB3, -TB3S
On-state voltage 0V dc...0.4V dc
Output current rating 24mA maximum per channel
Off-state voltage 4.5V...5.5V dc typical
On-state current 0.15mA minimum per channel
Off-state leakage 0.1mA maximum
Isolation voltage 50V (continuous), Basic Insulation Type, between field side and syste m
(1)
Output signal delay
(Resistive load)
Flexbus current 80mA
Power dissipation 0.8W maximum @ 5.5V dc
Thermal dissipation 3.41 BTU/hr maximum @ 5.5V dc
Pilot duty rating Not rated
Indicators (field side indication,
customer device driven)
(1)
The time from the receipt of an on or off command to the output actually turning on or off.
IMPORTANT
TTL outputs are inverted
(On=1=logic low voltage=0…0.4V dc;
Off=0=logic high voltage=4.5…5.5V dc).
Use a NOT instruction in the ladder program to convert to traditional
true=High logic.
4.1mA maximum @ 5V dc
1.5K ohms typical
Type tested at 707V dc for 60 s, between field side and system
No isolation between individual channels
16 yellow status indicators
0.25ms, 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms, 32ms
0.25ms, 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms, 32ms
24mA maximum per channel
Type tested at 707V dc for 60 s, between field side and system
No isolation between individual channels
Off to On - 0.25ms maximum
On to Off - 0.5ms maximu m
16 yellow status indicators
Publication 1794-IN119A-EN-P - June 2008
General Specifications - 1794-IG16, 1794-OG16
Specification Description
Terminal base screw torque Determined by installed terminal base
Dimensions (with module installed)
H x W x D
External dc power supply voltage 5V dc nominal
External dc power voltage range 4.5...5.5V dc
External dc power supply current 1794-IG16 - 210mA max @ 5V dc
North American temp code T4A
Keyswitch position 1
Enclosure type rating None (open-style)
Wire type Shielded (Power and I/O)
Wire size Determined by installed terminal base
Wiring category
(1)
(1)
Use this Conductor Category information for planning conductor routing. Refer to Industrial Automation Wiring and
Grounding Guidelines, publication 1770-4.1
94 x 94 x 69 mm
3.7 x 3.7 x 2.7 inches
(includes 50mV p-p ripple)
1794-OG16 - 100mA @ 5V dc
3- on signal ports
2- on power ports
.
Environmental Specifications
Specification Description
Operating temperature IEC 60068-2-1 (Test Ad, Operating Cold),
Storage temperature IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold),
Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
Vibration IEC60068-2-6 (Test Fc, Operating):
Shock IEC60068-2-27 (Test Ea, Unpackaged shock):
Emissions CISPR 11:
ESD immunity IEC 61000-4-2:
Radiated RF immunity IEC 61000-4-3:
EFT/B immunity IEC 61000-4-4:
Surge transient immunity IEC 61000-4-5:
Conducted RF immunity IEC 61000-4-6:
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
0...55 °C (32…131 °F)
IEC 60068-2-2 (Test Bb, Unpackaged Non-operating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Non-operating Thermal Shock):
-40…85 °C (-40…185 °F)
5…95% non-condensing
5g @ 10...500Hz
Operating 30g
Non-operating 50g
Group 1, Class A (with appropriate enclosu re)
6kV contact discharges
8kV air discharges
10V/m with 1 kHz sine-wave 80% AM fro m 80...2000 MHz
10V/m with 200 Hz 50% Pulse 100% A M at 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz
1V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz
±2k V at 5kHz on power ports
±2k V at 5kHz on signal ports
±2 kV line-earth(CM) on power ports
10V rms with 1 kHz sine-wave 80% AM from 150 kH z…80 MHz
Certifications
Certifications (when product is marked)
c-UL-us UL Listed Industrial Control Equipme nt, certified for US and Canada.
CE European Union 2004/108/EC EMC Di rective, compliant with:
C-Tick Australian Radiocommunications Act, compliant with:
(1)
See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and othe r certification
details.
See UL File E65584.
UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations,
certified for U.S. and Canada. See UL File E19 4810.
EN 61326; Meas./Control/Lab., Industria l Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clau se 8, Zone A & B)
AS/NZS CISPR 11; Industrial Emissions
(1)
Publication 1794-IN119A-EN-P - June 2008 4 PN-24535
Copyright © 2008 Rockwell Automation, Inc. All rights reserved.
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