Installation Instructions
WARNING
IMPORTANT
ATTENTION
ATTENTION
ATTENTION
ATTENTION
ATTENTION
ATTENTION
ATTENTION
FLEX I/O Grounded Cage Clamp
Temperature Terminal Base Unit
Catalog Number 1794-TB3GT
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
local Rockwell Automation sales office or online
athttp://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 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, or
recognize the consequence.
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.
available from your
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 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 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
• NEMA Standard 250 and IEC 60529, as applicable, for
explanations of the degrees of protection provided by
enclosures.
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.
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.
If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.
, for additional installation requirements.
European Hazardous Location Approval
The following adapters are European Zone 2 approved: 1794-TB3GT
European Zone 2 Certification (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.
FLEX I/O systems are 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.
Publication 1794-IN133A-EN-P - May 2012
2 FLEX I/O Grounded Cage Clamp Temperature Terminal Base Unit
WARNING
WARNING
AVERTISSEMENT
WARNING
WARNING
ATTENTION
ATTENTION
ATTENTION
A
B
A
C
DIN Rail
Position the terminal base at a slight angle and hook it
over the top of the DIN rail.
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 Rockwell Automation.
• 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 terminal bases are Hazardous Location approved: 1794-TB3GT
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 G roups A, B, C,
D, Hazardous Locations and nonhazardous
locations only. Each product is supplied with
markings on the rating nameplate in dicating the
hazardous location temperature code. W hen
combining products within a system, the most
adverse temperature code (lowest "T" number) may
be used to help determine the overall tempe rature
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.
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.
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.
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 en vironnements
de Classe I Division 2 Groupes A, B, C, D dangereux et
non dangereux. Chaque produit est livré avec d es
marquages sur sa plaque d'identification qui indique nt
le code de température pour les environnem ents
dangereux. Lorsque plusieurs pr oduits sont combinés
dans un système, le code de température le plus
défavorable (code de température le plus f aible) 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.
• LLa substitution de
composants peut rendre cet
équipement inadapté à une
utilisation en environnement
de Classe I, Division 2.
• S'assure r que l'environnement
est classé non dangereux
avant de changer les piles.
FLEX I/O Grounded Cage Clamp Temperature Terminal Base
2
34
1
5
6
11
10
9
7
1794-TB3GT
8
Description
1 Female FlexBus connector
2 Mounting holes for panel mounting
3 Module locking latch
4 Keyswitch - set to the position required for the installed module
5 Male FlexBus connector
6 Cover plug for male FlexBus connector
7 Terminal base unit
8 Locking tab
9…11 Input/output terminal strips for connecting inputs/output wiring,
commons, power connections, customer power supplies, chassis
grounds
Mount the Terminal Base Unit on a DIN Rail
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 upon application of power.
1. Remove the cover plug (if used) in the male connector of the unit to
which you are connecting this terminal base unit.
2. Check to make sure the 16 pins in the male connector on the adjacent
device are straight and in line so that the mating female connector on
this terminal base unit will mate correctly.
3. Make certain the female connector (B) is fully retracted.
4. Position the terminal base unit on the (35 x 7.5 x 1 mm) top-hat DIN
rail (A) (Allen-Bradley part number 199-DR1).
Do not force the terminal base into the adjacent base/adapter.
Forcing the units together can bend or break the hook and allow the
units to separate and break communication over the backplane.
For Class I Division 2 applications, use only Class I Division 2 listed or
recognized accessories and modules approved for use within the
1794 platform.
Publication 1794-IN133A-EN-P - May 2012
5. Rotate the terminal base onto the DIN rail with the top of the rail
ATTENTION
C
Make sure the hook (C) on the terminal base slides under the
edge of the adapter and the FlexBus connector is fully retracted.
Slide the terminal base over, tight against the adapter.
Press down on the terminal base to lock it on the DIN rail. If the
terminal base does not lock into place, use a screwdriver or
similar device to open the locking tab, press down on the base,
and release the locking lever to lock the base in place.
Gently push the FlexBus connector into the side of the side
of the adapter to complete the backplane connection.
IMPORTANT
ATTENTION
ATTENTION
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
Ch0 Ch4
24V DC
Supply
In
dnGdnG
24V DC
Supply
Out
+V C V+MOCOM
6 Chassis
Ground
for Shields
Chassis GroundChassis Ground
+ H +H+H+H+H+H+H+H
L -L-L-L- L-L -L- -L
Ch1 Ch5
Ch2 Ch6 Ch3 Ch7
CJC1 CJC2
+24V DC = Terminals C-34, C-50
COM = C-35, C-51
Chassis Ground = Terminals B-16, B-33, C-38, C-40…45, C-47
Ch0 = A-0…A-1, B-17…B-18
Channel grouping:
Ch1 = A-4…A-5, B-21…B-22
Ch2 = A-8…A-9, B-25…B-26
Ch4 = A-2…A-3, B-19…B-20
Ch5 = A-6…A-7, B-23…B-24
Ch3 = A-12…A-13, B-29…B-30 Ch7 = A-14…A-15, B-31…B-32
Ch6 = A-10…A-11, B-27…B-28
For daisy-chaining: Supply in - C-34 (+), C-35 (-)
Supply out - C-50 (+), C-51 (-)
CJC1 tail = A1
CJC2 tail = A14
hooked under the lip on the rear of the terminal base. Use caution to
make sure that the female FlexBus connector does not strike any
of the pins in the mating connector.
FLEX I/O Grounded Cage Clamp Temperature Terminal Base Unit 3
Wire Connections for the 1794-TB3GT
The 1794-TB3GT terminal base is for use with 1794-IRT8 and
1794-IRT8XT, Series B modules only.
Do not wire more than 2 conductors on any single terminal.
6. Refer to the installation instructions for specific wiring information
for the module you are installing in this terminal base.
7. Repeat the above steps to install the next terminal base.
When using FLEX I/O modules in a high-vibration installation,
especially when mounting the DIN rail vertically, use DIN-rail locks
(A-B part number 1492-EA35) to prevent accidental separation of the
terminal block units.
The wiring on this base unit is different from other terminal base
units in FLEX I/O. Make certain that connections are correct before
applying power.
Publication 1794-IN133A-EN-P - May 2012
4 FLEX I/O Grounded Cage Clamp Temperature Terminal Base Unit
ATTENTION
Wiring
when total current draw is less than 10 A
W
iring when total current draw is greater than 10 A
Daisy-chaining
Individual
Combination
24V
DC
24V DC
24V DC
24V DC
24V DC
24V DC
Note:
Use this configuration if using any
“noisy” DC digital I/O modules in your system.
Thermocouple
Module wiring separate from discrete wiring.
Note:
All modules powered by the same power supply
must be analog modules for this configuration.
Note:
All modules must be analog modules for this configuration.
Thermocouple
or
Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Thermocouple
or Analog Module
Typical Wiring Guidelines Specifications
General
Attribute Value
Terminal screw
torque
Current capacity,
max
FlexBus current 5V DC, 640 mA
Voltage rating,
max
Isolation voltage 50V (continuous), Basic Insulation Type
Enclosure type
rating
Wire size
(1)
Total current draw through the terminal base unit is limited to 10 A.
Separate power connections may be necessary.
Wiring category
North American
temp code
IEC temp code T4
Dimensions,
approx.
(HxWxD)
(1)
Use this Conductor Category information fo r planning conductor routing. Refer to Industrial Automation
Wiring and Grounding Guidelines, publication 177 0-4.1.
0.79...1.02 Nm (7…9 lb-in.)
V/COM terminals: 10 A
I/O terminals: 2 A
V/COM terminals: 31.2V DC/AC, 50/60 Hz
Tested at 500V for 60 s, Field to FlexBus, or installed module.
None (open-style)
0.21... 1.3 mm
2
(24…16 AWG) stranded copper wire rated at
75 °C (167 °F ) or greater, 1.2 mm (3/64 in.) insulation max
Established by installed module
T4A
94 x 94 x 69 mm
(3.7 x 3.7 x 2.7 in.)
(with module installed in terminal base)
Publication 1794-IN133A-EN-P - May 2012
FLEX I/O Grounded Cage Clamp Temperature Terminal Base Unit 5
35
(1.4)
59
(2.3)
87
(3.4)
94
(3.7)
94
(3.7)
80
(3.2)
28
(1.2)
50
(2.0)
23
(0.9)
68
(2.7)
80
(3.2)
21 (0.83)
(3.4 x 2.7 x 2.7)
87 x 68 x 69
(3.7 x 3.7 x 2.7)
94 x 94 x 69
(3.7 x 3.7 x 2.7)
94 x 94 x 69
Secure DIN rail approximately every 200 mm (7.87 in.).
A = Mounting hole dimensions for optional mounting kit.
B = DIN rail.
C = Operating temperature 25.4 (1.0) below each module when mounted in any position
must not exceed 55 °C (131 °F).
Measure here for
vertical mounting
position with
adapter up.
Measure here for horizontal position.
A
B
C
Terminal Base (1794-TB3S shown) Terminal Base (1794-TB3GT shown)Adapter
94
(3.7)
94
(3.7)
35
(1.4)
Maintain at least 25.4 (1.0) air space around your FLEX I/O system installation.
Mounting Dimensions and Spacing Requirements
mm
(in.)
Environmental
Attribute Value
Temperature,
operating
Temperature,
surrounding air,
max
Temperature,
nonoperating
Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
Vibration IEC 60068-2-6 (Test Fc, Operating):
Shock, operating IEC 60068-2-27 (Test Ea, Unpackaged Shock):
Shock,
nonoperating
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…70 °C (-4…158 °F)
70 °C (158 °F)
IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold),
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% noncondensing
5 g @ 10…500 Hz
30 g
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
50 g
Certifications
(1)
Attribute Value
c-UL-us UL Listed Industrial Control Equipment, certified for US and
Canada. See UL File E65584.
UL Listed for Class I, Division 2 Gr oup A,B,C,D Hazardous Locations, certified for
U.S. and Canada. See UL File E194810.
CE
C-Tick
Ex
TÜV
(1)
See the Product Certification link at http://www.ab.com for Declaration of Conformity, Certificates, and
other certification details.
European Union 2004/108/EC EMC Direct ive, compliant with:
EN 61326-1; Meas./Control/Lab., Industria l Requirements
EN 61000-6-2; Industrial Immuni ty
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clau se 8, Zone A & B)
Australian Radiocommunications Act, compliant with:
AS/NZS CISPR 11; Industrial Emissions
European Union 94/9/EC ATEX Directive, compliant with:
EN 60079-15; Potentially Explosive Atmosph eres, Protection "n"
EN 60079-0; General Requirements
II 3 G Ex nA IIC T4 X
TÜV Certified for Functional Safety:
Capable of SIL 2
Publication 1794-IN133A-EN-P - May 2012
Publication 1794-IN133A-EN-P - May 2012 6 PN-157434
Copyright © 2012 Rockwell Automation, Inc. All rights reserved.
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