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.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 we use notes to make you aware of safety considerations.
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 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
Identifies information that is critical for successful application and understanding
of the product.
Labels may be located on or inside the equipment (for example, drive or
motor) to alert people that dangerous voltage may be present.
SGI-1.1 available from your local Rockwell
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 m (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,
publication 1770-4.1, for additional installation requirements.
NEMA Standard 250 and IEC 60529, as applicable, for explanations
of the degrees of protection provided by enclosures.
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.
Use a static-safe workstation, if available.
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.
Labels may be located on or inside the equipment (for example, drive or
motor) to alert people that surfaces may be dangerous temperatures.
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.
For Class I Division 2 applications, use only Class I Division 2 listed or
recognized accessories and modules approved for used within the 1794
platform.
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.
Publication 1794-IN039F-EN-P - November 2011
Page 2
2 FLEX™ I/O Isolated Input/Output Analog Module
ATTENTION
WARNING
WARNING
AVERTISSEMENT
ATTENTION
ATTENTION
ATTENTION
45284
6
5
4
3
2
1
7
If multiple power sources are used, do not exceed the specified isolation
voltage.
European Hazardous Location Approval
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 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.
Observe the following additional 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.
This equipment must be used only with ATEX certified Rockwell
Automation terminal bases.
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.
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.
North American Hazardous Location Approval
The 1794-IF2XOF2I module is hazardous location approved.
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.
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.
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.
Install the Analog Input/Output Module
DescriptionDescription
1 FlexBus connectors5 Groove
2 Latching mechanism6 Alignment bar
3 Keyswitch7 Module
4 Terminal base
The module mounts on a 1794 terminal base.
1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 5 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.
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.
This product 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.
Connect Wiring for the Analog Inputs and Outputs
1. 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, and 1794-TB3TS:
Connect individual input/output wiring to numbered terminals on the
0…15 row (A) as indicated in the Wiring Connections for 1794-IF2XOF2I
Input/Output Module 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
for 1794-IF2XOF2I Input/Output Module table. Use Belden 8761 cable
for signal wiring.
Connect only one current or one voltage signal per channel. Do not
connect both current and voltage on one channel.
Wiring Connections
Publication 1794-IN039F-EN-P - November 2011
Page 3
FLEX™ I/O Isolated Input/Output Analog Module 3
ATTENTION
45753
Row A
Row B
Row C
Current
input
Voltage
input
Current
output
device
Voltage
output
device
AC or DC
4-wire current
transmitter
DC only
3-wire
transmitter
Current only
2-wire output
device
DC only
3-wire output
device
Label placed at top of wiring area
Row A
Row B
Row C
1794-TB3S
45754
Even-numbered terminals 0...141633
3451
Row B
Row C
DC only
3-wire output
device
Current only
2-wire output
device
DC onlyAC or DC
4-wire current
transmitter
Current
input
Voltage
input
Current
output
device
Voltage
output
device
3-wire
transmitter
2. 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS: Connect
each channel signal return to numbered terminals on the 0…15 row (A) as
indicated in the Wiring Connections for 1794-IF2XOF2I Input/Output
Module 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
1794-IF2XOF2I Input/Output Module table.
3. Connect any signal wiring shields to functional ground as near as possible
to the module.1794-TB3T or 1794-TB3TS only: Connect to earth ground terminals
C-39…C-46.
4. Connect the +V DC power to terminal 34 on the 34…51 row (C) and -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.
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 (-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.
Wiring Connections for 1794-IF2XOF2I Input/Output Module
ChannelSignal Type Label
Input 0CurrentI0A-0C-39B-0
Input 1CurrentI1A-4C-41B-4
Output 0CurrentI2A-8C-43B-8
Output 1CurrentI3A-12C-45B-12
-V DC common 1794-TB2, 1794-TB3, 1794- TB3S: Terminals B-16…B-33 are internally connected in the
+V DC power1794-TB3, 1794-TB3S: Terminals 34…51 are internally connected in t he terminal base unit.
Chassis ground
(shield)
CurrentI0 retA-1C-1
Volt ageV0A-2C-40B-2
Volt ageV0 retA-3C-3
CurrentI1 retA-5C-5
Volt ageV1A-6C-42B-6
Volt ageV1 retA-7C-7
CurrentI2 retA-9C-9
Volt ageV2A-10C-44B-10
Volt ageV2 retA-11C-11
CurrentI3 retA-13C-13
Volt ageV3A-14C-46B-14
Volt ageV3 retA-15C-15
terminal base unit.
1794-TBN: Terminals B-16 and B-33 are internally connected in the terminal b ase unit.
1794-TB3T, 1794-TB3TS: Terminals 16, 17, 19, 21, 23, 25, 27, 29, 3 1 and 33 are internally
connected in the terminal base unit.
1794-TB3T, 1794-TB3TS: Terminals 34, 35, 50 and 51 are internally connected in the terminal
base unit.
1794-TBN, 1794-TB2: Terminals 34 and 51 are internally connected in the terminal base unit.
1794-TB3T, 1794-TB3TS: Terminals 39…46 are internally connected to chassis g round.
Word 0 Analog value for input channel 0
Word 1 Analog value for input channel 1
Word 2 Read back output channel 0
Word 3 Read back output channel 1
Word 4 0Real-time sample
Word 5 PU FP CF 0Reser ved00000BD DN 0
Word 6 0000P1 P0 0000V1 V0 W1 W0 U1 U0
Where: PU = Power up inconfigured
FP = Field power off
CF = In configuration mode
BD = Calibration bad
DN = Calibration done
U = Under range for specified channel
W = Wire off current loop status for output channels 0 and 1
V = Over range for specified channel
P = Outputs holding in response to Q0 and Q1
Word 0 EN S1 S0 0000000000000
Word 1 Analog output data – channel 0
Word 2 Analog output data – channel 1
Word 3 00000000Input channel 1 filterInput channel 0 filter
Publication 1794-IN039F-EN-P - November 2011
Page 4
4 FLEX™ I/O Isolated Input/Output Analog Module
Output Map
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Word 4 Output channel 1
configuration
Word 5 0Real time sample programmed interval
Word 6 IC 1TR ITQ1 Q0 00RV QK CK GO Channel number
Where: EN = Output enable bit
S0 and S1 = Safe state source bits
TR = Transparent bit
IT = Interrupt toggle bit
IC = Initiate configuration bit
Q0 and Q1 = Requests for outputs to hold
RV = Revert to defaults bits
QK = Quick calibration
CK = Calibration clock
oGO = Gain offset select
Output channel 0
configuration
Input channel 1
configuration
Input channel 0
configuration
Configure the Input Channels
Input Channel Configuration
03020100Set these bits for channel 0
07060504Set these bits for channel 1
00014...20 mA7.5 ms5.0 ms
0010±10V2.5 ms2.5 ms
0011±5V2.5 ms2.5 ms
01000...20 mA7.5 ms5.0 ms
01014…20 mA7.5 ms5.0 ms
01100…10V5.0 ms5.0 ms
0111±10V5.0 ms5.0 ms
10000…20 mA2.5 ms2.5 ms
10014…20 mA7.5 ms5.0 ms
10100…10V2.5 ms2.5 ms
10110…5V2.5 ms2.5 ms
1100+20 mA2.5 ms2.5 ms
11014…20 mA7.5 ms5.0 ms
1110±10V2.5 ms2.5 ms
1111±5V2.5 ms2.5 ms
(1)
When IT = 1, the channel update rate for all channels is determined by the slowest channel.
Channel Update Rate
RTSI = 0 and No Low
Pass Filter
(1)
RTSI and Filter = 0
IT Bit = 1
Set the Input Filters
Input Channel Filter
03020100Set these bits for channel 0
07060504Set these bits for channel 1
Bit SettingsA/D Conversion RateLow Pass Filter
00001200 HzNo low pass
00011200 Hz100 ms low pass
00101200 Hz500 ms low pass
00111200 Hz1000 ms low pass
0100600 HzNo low pass
0101600 Hz100 ms low pass
0110600 Hz500 ms low pass
0111600 Hz1000 ms low pass
1000300 HzNo low pass
1001300 Hz100 ms low pass
1010300 Hz500 ms low pass
1011300 Hz1000 ms low pass
1100150 HzNo low pass
1101150 Hz100 ms low pass
1110150 Hz500 ms low pass
1111150 Hz1000 ms low pass
Configure the Output Channels
Output Range Selection and Update Rate
11100908Set these bits for channel 0
15141312Set these bits for channel 1
MSDLSD
00014...20 mASigned 2’s
0010±10V<8618…79E82.5 ms
0011±5V<8618…79E8>2.5 ms
01000...20 mASigned 2’s
01014…20 mA<0…10000>5.0 ms
01100…10V0…100005.0 ms
0111±10V<-10000…10000>5.0 ms
10000…20 mABinary0000…F3CF2.5 ms
10014…20 mA0000…F0F15.0 ms
10100…10V0000…F3CF2.5 ms
10110…5V0000…F3CF2.5 ms
11000…20 mAOffset binary<8000…F9E8>2.5 ms
11014…20 mA<8000…F878>5.0 ms
1110±10V<0618…F9E8>2.5 ms
1111±5V<0618…F9E8>2.5 ms
complement
complement %
<0000…7878>5.0 ms
0…10000>5.0 ms
Rate
Status Indicator
The OK status indicator is two-colored: red and green. The indicator flashes green
for one of three reasons:
1. The module configuration word is zero (for example, power up reset
condition).
2. The 24V DC user power is off.
3. The module is in configuration mode.
The indicator displays red to indicate that the module did not pass the initial
hardware test. Cycle power again.
After power up, if the status indicator is not flashing green or solid green, cycle
module power once more to verify a proper reset of the bus interface.
Specifications
General Specifications
AttributeValue
Module location1794-TB2, 1794-TB3, 1794-TB3S, 1794 -TB3T, 1794-TB3TS, or 1794-TBN
FlexBus voltage5V DC
FlexBus current50 mA
External DC power supply,
nom voltage range
External DC power supply
current
Thermal dissipation, max11.3 BTU/hr @ 31.2V DC
Power dissipation, max3.3 W @ 31.2V DC
terminal base.
24V DC
19.2…31.2V DC (includes 5% AC ripple)
150 mA @ 24V DC
Publication 1794-IN039F-EN-P - November 2011
Page 5
FLEX™ I/O Isolated Input/Output Analog Module 5
General Specifications
Isolation voltage120V (continuous), Basic Insulation Type, channel to channel, channel to user,
Indicators1 red/green power/status indicator
Keyswitch position5
Dimensions, with module
installed in base; HxWxD
CalibrationFactory-calibrated for 150 Hz, 300 H z, and 600 Hz. Can be recalibrated when
Conductor category
Conductor wire sizeDetermined by installed terminal base
Wire typeShielded on signal ports
North American temp code T4A
IEC temp codeT4
(1)
Use this conductor cate gory information for planning conductor routing. Refer to Industrial Automation W iring and
Grounding Guidelines, p ublication 1770-4.1
channel to system, and user power to syst em when used with 1794-TB2,
1794-TB3, 1794-TB3S, 1794-TB3T, or 1794-TB3TS.
250V (continuous), Basic Insulation Type, channel to channel, channel to user,
channel to system, and user power to syst em when used with 1794-TBN.
Type tested at 1000V AC for 60 s.
94.0 x 94.0 x 66.0 mm
(3.7 x 3.7 x 2.6 in.)
necessary.
(1)
2 – on signal ports
2 – on power ports
.
Input Specifications
AttributeValue
Number of inputs2 isolated
Resolution
Volt age
Current
Data format2’s complement
Conversion typeSigma Delta
Update rate2.5/5.0/7.5 ms all channels (see Update Rate for Real Time Sample Interval = 0
Input current terminal4…20 mA (use r configurable)
Input voltage terminal±10V (user configurable)
Normal mode rejection ratio –
voltage or current terminal
Common mode rejection ratio -120 dB @ 50/60 Hz
Step response to 63% –
voltage or current terminal
Input resistance
Voltage terminal
Current terminal
Absolute accuracy
Voltage terminal
Current terminal
Accuracy drift w/temperature
Voltage terminal
Current terminal
(1)
Includes offset, gain, non-linearity and repeatability error terms.
(2)
If 24V DC is removed from the module, in put resistance = 10 k
16 bits – unipolar; 15 bits plus sign – bipolar
0.156 mV/cnt unipolar; 0.313 mV/cnt bipola r
0.320 A/cnt unipolar; 0.640 A/c nt bipolar
2’s complement %
Binary
Offset binary
table)
0…20 mA (user configurable)
±20 mA (user configurable)
10V/m with 1 kHz sine-wave 80% AM fr om 80…2000 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM @ 189 0 MHz
3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
±2 kV @ 5 kHz on power ports
±2 kV @ 5 kHz on shielded signal ports
±1 kV line-line(DM) and ±2 kV line-earth(CM) on power ports
±2 kV line-earth(CM) on shielded signal ports
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz
Publication 1794-IN039F-EN-P - November 2011
Page 6
Certifications (when product is marked)
(1)
AttributeValue
c-UL-usUL Listed Industrial Control Equipment, certified for US and Canada. See UL
CSACSA Certified Process Control Equipment. See CSA File LR54689C.
ExEuropean Union 94/9/EC ATEX Directive, compliant with:
CEEuropean Union 2004/108/EC EMC Di rective, compliant with:
C-TickAustralian Radiocommunications Act complia nt with:
TÜV
(1)
For the latest up-to-date information, see the Product Certification link at www.ab.com for Declarations of
Conformity, Certificates and other certification details.
(2)
When used with specified firmware revisions.
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 E194810.
CSA Certified Process Control Equipment for Class I , Division 2 Group A,B,C,D
Hazardous Locations. See CSA File LR69960C.
EN 60079-15; Potentially Explosive Atmospher es, Protection "n"
EN 60079-0; General Requirements
II 3 G Ex nA IIC T4 X
EN 61326-1; Meas./Control/Lab., Ind ustrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissi ons
EN 61131-2; Programmable Controllers (Clau se 8, Zone A & B)
European Union 2006/95/EC LVD, compliant with:
EN 61131-2; Programmable Controllers (Clau se 11
AS/NZS CISPR 11, Industrial Emissions
TÜV Certified for Functional Safety
Capable of SIL 2
(2)
:
Allen-Bradley, Rockwell Automation, FLEX, and TechConnect are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.
Publication 1794-IN039F-EN-P - November 2011 6PN-126017