1794-IN050 - Rockwell Automation

1794-IN050 - Rockwell Automation
Installation Instructions
FLEX I/O Thermocouple/RTD Input Analog
Module
Cat. No. 1794-IRT8/B, 1794-IRT8K/B and
1794-IRT8XT/B
WARNING
ATTENTION
(Modules with a K in the last position of the catalog number are
conformally coated to meet noxious gas requirements of ISA/ANSI-71.040
1985 Class G3 Environment.)
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://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.
Identifies information about practices or circumstances that can cause
WARNING
an explosion in a hazardous environment, which may lead to personal
injury or death, property damage, or economic loss.
IMPORTANT
ATTENTION
ATTENTION
WARNING
ATTENTION
ATTENTION
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.
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.
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.
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:
• 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.
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.
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, and recognize the
consequence
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.
ATTENTION
ATTENTION
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.
To reduce susceptibility to noise, power analog modules and digital modules
from separate power supplies. Do not exceed a length of 3 m (9.8 ft) for DC
power cabling.
European Hazardous Location Approval
European Zone 2 Certification (The following applies when the product bears the Ex
or EEx 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 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.
Publication 1794-IN050J-EN-P - January 2009
2
WARNING
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
Allen-Bradley.
• 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.
Install Your TC/RTD Input Module
7
1
3
2
6
4
5
North American Hazardous Location Approval
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.
WARNING
EXPLOSION HAZARD
AVERTISSEMENT
• 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.
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.
Series A/Series B Differences
When In
1794-IRT8 Series A
1794-IRT8, -IRT8XTSeries B
Isolation
Between user side and system side
Common Mode
Range
+4V DC
Between user 24V dc and user I/O;
Between user side and system side
+15V DC
Thermocouple
Mode Wire-off
Detection
When an open sensor is detected, data
defaults to maximum value
When open sensor is detected, data
defaults to minimum value
ATTENTION
ATTENTION
To simulate series A module wire-off detection behavior using a series B
module, connect a wire between terminals 39 and 48 on the 1794-TB3G or
1794-TB3GS terminal base unit. If not connected, the Series B module will
default to Series B functionality.
In RSLogix 5000, if using a series B product to replace a series A product, the
module will be accepted without an electronic keying mismatch warning.
This is true for 1794-IRT8 and 1794-IRT8XT modules installed on Ethernet/IP,
ControlNet, DeviceNet, or Remote I/O networks.
ATTENTION
During mounting of all devices, be sure that all debris (for example, metal
chips or wire strands) is kept from falling into the module. Debris that falls
into the module could cause damage on power up.
The module mounts on a 1794-TB3G or 1794-TB3GS terminal base.
1. Rotate the keyswitch (1) on the terminal base (2) clockwise to
position 3 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.
WARNING
If you remove or insert the module while the 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.
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 terminal base
unit. The module is seated when the latching mechanism (7) is
locked into the module.
Connect Wiring for the 1794-TB3G, 1794-TB3GK and 1794-TB3GS Terminal
Base
1. Connect individual input wiring and associated signal returns
to numbered terminals on the 0…15 row (A) and the 16…33
row (B) as indicated in the table.
Use Belden 8761 cable for mV signal wiring, or the appropriate
thermocouple wire for your thermocouples.
2. Signal wiring shields can be connected to terminals 16 or 33 on
row (B) or terminals 40…45 on row (C).
3. Connect the +V DC power lead to terminal 34 on the 34…51 row
(C).
4. Connect the -V DC common (return-) to terminal 35 on the 34…51
row (C).
ATTENTION
Do not daisy-chain power or ground from this terminal base unit to any AC or
DC digital module terminal base units.
5. If daisy-chaining power to the next terminal base unit, connect a
jumper from terminal 50 (+V DC) on this base unit to +V terminal
on the next terminal base unit.
Connect a jumper from terminal 51 (-V DC common) to the -V DC
common terminal on the next terminal base unit.
6. If using cold junction compensators, make these connections as
shown in the CJC Sensor chart below.
Publication 1794-IN050J-EN-P - January 2009
3
Identify RTD Wire Pairs
If the RTD wires are color-coded, the wires that are the same color are
connected together. If the wires are not color-coded, use an ohmmeter to
determine the pairs as explained below.
Connections for terminal Base 1794-TB3G shown
0
1
+
2
H
3
4
-
L
5
+
H
Channel 0
How to Connect a 4-wire RTD
17
16
If the 4-wire RTD wires are all different colors, use an ohmmeter to
determine which leads are connected together. One of the leads in each
pair is the compensation lead. Either lead of the pair can be the
compensation lead. Attach one pair to terminals L and - and the other pair
to + and H.
+
7
8
-
L
+
RTD
19
20
21
H
L
-
+
Channel 4
2
1
3
3-wire 2
1
1a
2a
2
4-wire
Thermocouple
1
10
11
12
L
-
+
Channel 2
22
23
24
25
H
L
-
+
Channel 5
13
14
15
H
L
-
Channel 3
26
27
28
H
L
-
29
+
Channel 6
30
31
H
L
35
34
32
33
-
Channel 7
Chassis Gnd
36
37
38
+V COM
Gnd
24V dc
Supply
In
CJC
39
40
41
42
43
44
45
46
47
6 Chassis
Ground
for Shields
48
49
50
51
Gnd
+V COM
CJC
24V dc
Supply
Out
Example of RTD and Thermocouple Wiring to a 1794-TB3G Terminal Base
Unit
Thermocouple Channel 4
1
+
_
2
2-W ir e R TD Channel 1
1
Type of Input
1
2-wire
H
Channel 1
18
Wire Connections for the Thermocouple/RTD Module
Wire Number
9
Chassis Gnd
How to Connect a 3-wire RTD
If the 3-wire RTD wires are all different colors, use an ohmmeter to
determine which leads are connected together. Either lead of the pair can
be the compensation lead. Attach one lead of the pair to terminal L and
the other to +. Attach the single lead to -.
Refer to the following table.
6
Connect The Following
H
L
+
Shield1
RTD - 2-wire
1
2
RTD - 3-wire
3
1
2
RTD - 4-wire
1a
2a
1
2
Thermocouple
1
2
Millivolt
1
2
1
Shield can be connected to chassis ground terminals
16, 33, and 40…45.
2
3-W ir e R TD Channel 2
1
3
2
4-W ir e R TD Channel 3
1
1a
2a
2
1
0
0
Numbers 1, 1a, 2, 2a, and 3 are wire numbers of the sensor
used. For terminal numbers corresponding to H, L, +, -, refer to
Terminal Base Unit Wiring Connections below.
16
2
1
2
17
18
35
34
3
4 5
3
19
36
4
20
5
37
38
6
7
6
21
22
39
7
23
8 9 10 11 12 13 14 15
8
24
40
41
9
25
42
10
26
43
11
27
44
12
28
45
13
29
46
14
30
47
15
31
48
32
49
33
50
51
0…15
A
16…33 B
34…51 C
1794-TB3G
CJC
2
Millivolt
Input
CJC Sensor
+
Chassis
Ground
-
CJC1
C-37
C-38
C-39
CJC2
C-46
C-47
C-48
1
+
mV
-
2
CJC
Tail(1)
A-5
(B-22)
A-12
(B-29)
Attention: Keep exposed area of inner conductor as short as possible.
Example of Millivolt Wiring to a 1794-TB3G Terminal Base Unit
Millivolt
Source
_
+
1
Terminals 37, 38, and 39, and 46, 47, and 48 are for cold
junction compensation (with 38 and 47 chassis GND).
Connect the tail of CJC1 to terminal 5 and CJC2 to terminal 12 if
channels 0…3 or 0…7 are configured for thermocouples.
Connect the tail of CJC1 to terminal 22 and CJC2 to 29 if channels
4…7 are configured for thermocouples.
Millivolt
Source
_
+
Millivolt
Source
_
+
Millivolt
Source
_
+
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0
16 17
34
0
1
2
3
4
5
6
7
1
2
18 19
3
4
20
36 37
5
6
7
8
21 22 23 24
38
9
10
25 26
39 40 41 42
27
43 44
11 12
13 14 15
28 29
45
30
46 47
31 32 33
48 49 50 51
0 …15 A
16…33 B
34…51 C
1794-TB3G
Attention: Keep exposed area of inner conductor as short as possible
Terminal Base Unit Wiring Connections
RTD
or TC
Channel
1
35
1794-TB3G, 1794-TB3GK, and 1794-TB3GS Terminal Base Units
High Signal
Terminal (H)
Low Signal
Terminal (L)
A-1
A-2
A-5
A-6
A-9
A-10
A-13
A-14
B-18
B-19
B-22
B-23
B-26
B-27
B-30
B-31
Terminals 16, 33, and 40…45 are chassis ground.
RTD Source
Current (+)
Signal
Return (-)
A-0
A-4
A-8
A-12
B-17
B-21
B-25
B-29
A-3
A-7
A-11
A-15
B-20
B-24
B-28
B-32
Block Transfer Read and Write
The following block transfer read and write word bit information is
presented for experienced users only. Refer to the user manual, publication
1794-UM012, for complete information on programming and configuring
your module.
Input Map (Read)
Dec.
Oct.
15
17
14
16
13
15
12
14
11
13
10
12
09
11
Word 0
Channel 0 Input Data
Word 1
Channel 1 Input Data
Word 2
Channel 2 Input Data
Word 3
Channel 3 Input Data
Word 4
Channel 4 Input Data
Word 5
Channel 5 Input Data
Word 6
Channel 6 Input Data
Word 7
Channel 7 Input Data
Word 8
Overrange Alarm Bits (channel 0 = bit 8, etc.)
08
10
07
07
06
06
05
05
04
04
03
03
02
02
01
01
00
00
Underrange Alarm Bits (channel 0 = bit 0, etc.
Publication 1794-IN050J-EN-P - January 2009
4
Dec.
Oct.
15
17
14
16
13
15
12
14
11
13
10
12
09
11
08
10
Word 9
Ch 7
Flt
Ch 6
Flt
Ch 5
Flt
Ch 4
Flt
Ch 3
Flt
Ch 2
Flt
Ch 1
Flt
Ch 0
Flt
Word 10
Command Response
Where: SAB =
Alm = Alarm
Flt = Fault
07
07
06
06
05
05
04
04
CJC2 CJC1 SAB
Alm Alm
03
03
02
02
01
01
00
00
CJC Reserved
Status
Dec.
Oct.
15
17
14
16
Word 0
Reserved
Word 1
TC/RTD Ch
4-7
RTD Offset
Ch 7
Word 3
Bit
Bit
Response Data
Series of unit; 0 = Series A, 1 = Series B
Output Map (Write)
Word 2
TC/RTD Input Type Selection - Write Word 1
13
15
11
13
10
12
09
11
08
10
07
07
06
06
05
05
Data Format
Flt
Mod
e Ch
4-7
Flt
Mod
e Ch
0-3
Reference Jct.
Sensor
Mode
Ch 4-7
Sensor Type
Ch 4-7
TC/RTD
Ch 0-3
RTD Offset
Ch 6
RTD Offset
Ch 5
RTD Offset
Ch 4
RTD
Offset
Ch 3
04
04
03
03
02
02
01
01
00
00
Filter Cutoff
Sensor
Mode
Ch 0-3
Sensor Type
Ch 0-3
RTD Offset
Ch 2
RTD Offset
Ch 1
RTD Offset
Ch 0
Command Data
11
10
09
08
0
0
Thermocouple
0
1
RTD
1
0
Not used
1
1
Not used
0
0
0
0
°C (implied decimal point XXXX.X)
0
0
0
1
°F (implied decimal point XXXX.X)
0
0
1
0
°K (implied decimal point XXXX.X)
0
0
1
1
-32767…+32767
0
1
0
0
0…65535
02
10
01
09
00
08
Sensor type for channels 0…3
Sensor type for channels 4…7
0
0
0
0
Resistance (default)
0
0
0
1
100 Ω Pt α = 0.00385 Euro -200…+870 °C(-328…+1598 °F)
0
0
1
0
200 Ω Pt α = 0.00385 Euro -200…+400 °C(-328…+752 °F)
0
0
1
1
100 Ω Pt α = 0.003916 U.S. -200…+630 °C(-328…+1166 °F)
0
1
0
0
200 Ω Pt α = 0.003916 U.S. -200…+400 °C(-328…+752 °F)
0
1
0
1
100 Ω Nickel -60…+250 °C(-76…+482 °F)
0
1
1
0
200 Ω Nickel -60…+200 °C(-76…+362) °F)
0
1
1
1
120 Ω Nickel -80…+320 °C(-112…+608 °F)
1
0
0
0
10 Ω Copper -200…+260 °C(-328…+470 °F)
1001 thru 1111 not used
Thermocouple Type
Bit 03 02 01
Bit 11 10 09
0101 thru 1111 not used
Module defaults to -4000…10000 in millivolt mode, and 0…5000 in ohms mode with implied decimal points (for
example, -40 mV, 0.01 Ω) whenever °C, °F or °K is selected.
Fault Mode - Write Word 0
06
07
Input type for channels 0…3
Input type for channels 4…7
RTD Type
Bit 03
Bit 11
Data Format for All Channels - Write Word 0
Bit
06
14
Sensor Type Select - Write Word 1
12
14
Command
Bit
07
15
Fault enable for channels 0…3
Fault enable for channels 4…7
0 = Disabled
1 = Enabled
00
08
Sensor type for channels 0…3
Sensor type for channels 4…7
0
0
0
0
mV (default)
0
0
0
1
B
300…1800 °C
(572…3272 °F)
0
0
1
0
E
-270…1000 °C
(-454…1832 °F)
0
0
1
1
J
-210…1200 °C
(-346…2192 °F)
0
1
0
0
K
-270…1372 °C
0
1
0
1
TXK/XK(L)-200…800 °C
(-328…1472 °F)
0
1
1
0
N
-270…1300 °C
(-450…2372 °F)
0
1
1
1
R
-50…1768 °C
(-58…3214 °F)
1
0
0
0
S
-50…1768 °C
(-58…3214 °F)
1
0
0
1
T
-270…400 °C
(-454…752 °F)
(-454…2502 °F)
1010 thru 1111 not used
RTD Offset Select - Write Word 2
Reference Junction Selection - Write Word 0
Bits
3-5
Bit
01
00
RTD Offset Select Bits - Channel 0
Reference Junction - used when sensor select is set to thermocouple and
sensor mode is set to internal compensation. Sets a fixed reference junction
to compensate all thermocouple channels.
Bit
03
02
RTD Offset Select Bits - Channel 1
Bit
05
04
RTD Offset Select Bits - Channel 2
Bit
Bit
07
06
RTD Offset Select Bits - Channel 3
05
04
03
Reference Junction
Bit
09
08
RTD Offset Select Bits - Channel 4
0
0
0
0 °C (32 °F)
Bit
11
10
RTD Offset Select Bits - Channel 5
0
0
1
20 °C (68 °F)
Bit
13
12
RTD Offset Select Bits - Channel 6
0
1
0
25 °C (77 °F)
Bit
15
14
RTD Offset Select Bits - Channel 7
0
1
1
30 °C (86 °F)
0
0
1
0
0
40 °C (104 °F)
1
0
1
50 °C (122 °F)
Use channel loop compensation value stored during calibration procedure for 2-wire RTD
(default = 0 Ω) - 15 Ω max (Note: Functional up to RTD = 484 Ω max with total lead
resistance = 15 Ω.
1
1
0
60 °C (140 °F)
1
1
1
70 °C )158 °F)
Add-on Filter Selections - Write Word 0
Bit
0
1
5 Ω (total lead resistance)
1
0
10 Ω (total lead resistance)
1
1
15 Ω (total lead resistance)
Specifications
02
01
00
Filter Time Constants - Actual filtering depends on the
module’s mode of operation.
Specifications - 24V dc Analog Module, Cat. No. 1794-IRT8, -IRT8K, IRT8XT
0
0
0
Hardware filtering only (default filtering)
0
0
1
25 ms
0
1
0
100 ms
0
1
1
250 ms
Number of inputs
Module Location
Nominal input voltage
ranges
1
0
0
500 ms
1
0
1
1s
1
1
0
2s
1
1
1
5s
Supported
thermocouple types
Sensor Mode Select - Write Word 1
Bit
Bit
05
13
04
12
Sensor mode for channels 0…3
Sensor mode for channels 4…7
Thermocouple
0
0
External compensation - uses cold junction sensors (Both CJC sensors must be used
when external compensation is selected.)
0
1
Internal compensation - uses the value selected for “reference junction selection”
1
0
No compensation (Data is referenced to 0 °C.)
1
1
Differential measurement between 2 channels (0-1, 2-3, 4-5, 6-7)
0
0
2-wire RTD no compensation
0
1
2-wire RTD with user selected compensation
1
0
3-wire RTD
1
1
4-wire RTD
Supported RTD types
RTD
Publication 1794-IN050J-EN-P - January 2009
Resolution
8 channels (2 groups of 4)
Cat. No. 1794-TB3G, 1794-TB3GS, 1794-TB3GK Terminal Base Units
-40…100 mV dc for thermocouples
0…325 mV for RTDs
mV (default)
Type Range °C
Range °F
B
300…1800 °C
(572…3272 °F)
E
-270…1000 °C
(-454…1832 °F)
J
-210…1200 °C
(-346…2192 °F)
K
-270…1372 °C
(-454…2502 °F)
TXK/XK(L)-200…800 °C (-328…1472 °F)
N
-270…1300 °C
(-454…2372 °F)
R
-50…1768 °C
(-58…3214 °F)
S
-50…1768 °C
(-58…3214 °F)
T
-270…400 °C
(-454…752 °F)
Resistance
100 Ω Pt α = 0.00385 Euro -200…870 °C(-328…1598 °F)
200 Ω Pt α = 0.00385 Euro -200…400 °C(-328…752 °F)
100 Ω Pt α = 0.003916 U.S. -200…630 °C(-328…1166 °F)
100 Ω Pt α = 0.003916 U.S. -200…400 °C(-328…752 °F)
100 Ω Nickel -60…250 °C(-76…482 °F)
200 Ω Nickel -60…200 °C(-76…362) °F)
120 Ω Nickel -80…320 °C(-112…608 °F)
10 Ω Copper -200…260 °C(-328…470 °F)
14 bits
5
Accuracy vs. filter cutoff
Data format
Common mode rejection
Common mode input
range
Isolation voltage
(continuous voltage
withstand rating)
System throughput (8
channels scanned) - Add
0.5 ms if filtering is
selected
Open circuit protection
Open input detection
time
Overvoltage capability
Overall drift with
temperature
Cold junction
compensation Range
Cold junction
compensator
Indicators
Flexbus current
Power dissipation
Thermal dissipation
Keyswitch position
0.05% of full range in millivolt mode with filtering selected
Hardware only = 0.10% of full range in millivolt mode
°C (implied decimal point XXX.X)
°F (implied decimal point XXX.X)
°K (implied decimal point XXX.X)
-32767…32767
0…65535
0…5000 (ohms mode) (implied decimal point XXX.X)
-4000…+10000 (millivolt mode) (implied decimal point XXX.XX)
-80 db @ 5V peak-to-peak, 50…60 Hz
Vibration
Shock
operating
nonoperating
Emissions
50V (continuous), Basic Insulation Type
Type tested at 1365V AC for 60 s, between field side and system
No isolation between individual channels"
Typical module timing is shown here.
7.4 ms - millivolt
8.0 ms - Ω - 2-wire RTD
10.0 ms - Ω - 3-wire RTD
10.4 ms - Ω - 4-wire RTD
8.0 ms - 2-wire RTD (°F)
10.4 ms - 4-wire RTD (°F)
8.8 ms - 2-wire RTD (°C), (°K)
10.8 ms - 4-wire RTD (°C), (°K)
9.8 ms - 3-wire RTD (°F)
10.0 ms - 3-wire RTD (°C), (°K)
9.0 ms - Thermocouples (°F)
9.4 ms - Thermocouples (°C), (°K)
ESD immunity
Radiated RF
immunity
EFT/B immunity
Surge transient
immunity
Conducted RF
immunity
RTD mode - Open input - Module defaults to max value
TC mode - Open input - Module defaults to min value
To simulate wire-off detection in Series A TC mode when using a Series B
module, attach a jumper from terminal 39 to terminal 48 on the 1794-TB3G,
1794-TB3GS, or 1794-TB3GK terminal base unit so that an open input will
default to max value.
Immediate detection (max 2 scans)
C-UL-US
CE
-20…100 °C
C-Tick
A-B catalog number 1794-CJC2
Ex
1 green power status indicator
8 red open input indicators
40 mA
3.0 W max @ 31.2V DC
Max 10.2 BTU/hr @ 31.2V DC
3
24V DC nom
19.2…31.2V DC (includes 5% AC ripple)
95 mA @ 24V DC
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)
IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% noncondensing
IEC 60068-2-6 (Test Fc, Operating):
5 g @ 10…500 Hz
IEC60068-2-27 (Test Ea, Unpackaged shock):
30 g
50 g
CISPR 11:
Group 1, Class A (with appropriate enclosure)
IEC 61000-4-2:
6 kV contact discharges
8 kV air discharges
IEC 61000-4-3:
10V/m with 1 kHz sine-wave 80% AM from 80…2000 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz
3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
IEC 61000-4-4:
±2 kV at 5 kHz on power ports
±2 kV at 5 kHz on shielded signal ports
IEC 61000-4-5:
±2 kV line-earth(CM) on shielded signal ports
IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz on shielded
signal ports
Certifications (when product is marked)(2)
15V DC continuous at 25 °C
50 ppm/°C of span (max)
External DC power
supply voltage
Supply current
Relative humidity
+15V min
General Specifications
Voltage range
Temperature, nonoperating
TUV
UL Listed Industrial Control Equipment, certified for US and Canada. 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 E194810.
European Union 2004/108/EC EMC Directive, compliant with:
EN 61326-1; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clause 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 Atmospheres, Protection "n" (II 3 G Ex nA IIC
T4 X)
EN 60079-0; General Requirements (Zone 2)
TÜV Certified for Functional Safety:
up to and including SIL 2
(1)
Use this category information for planning conductor routing as described in Industrial Automation Wiring and
Grounding Guidelines, Allen-Bradley publication 1770-4.1.
(2)
See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other
certification details.
(3)
Refer to the thermocouple manufacturer for proper thermocouple extension.
FLEX I/O and FLEX I/O-XT are trademarks of Rockwell Automation.
ATTENTION: To comply with the CE Low Voltage Directive (LVD), all connections
to this equipment must be powered from a source compliant with the following:
Dimensions (with
module installed in
base) HxWxD approx.
Temperature code, IEC
Temperature code,
North American
Enclosure type rating
Wire size
Signal conductors
Thermocouple
Millivolt
Wire type
Wiring category(1)
Terminal screw torque
for cage-clamp terminal
base
Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).
94 x 94 x 69 mm
(3.7 x 3.7 x 2.7 in.)
T4
T4A
None (open-style)
Determined by installed terminal base
Use appropriate shielded thermocouple wire(3)
Belden 8761
Shielded on signal ports
2 - on signal ports
3 - on power ports
Determined by installed terminal base
Environmental Specifications
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 °F) (1794-IRT8, 1794-IRT8K)
-20…70 °C (-4…158 °F) (1794-IRT8XT)
Publication 1794-IN050J-EN-P - January 2009
Publication 1794-IN050J-EN-P - January 2009 6
Supersedes Publication 1794-IN050I-EN-P - May 2007
PN-38820
Copyright © 2009 Rockwell Automation, Inc. All rights reserved.
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