Allen-Bradley FLEX Ex 24V DC Nonisolated Source 4 Output Module Installation Instructions

Installation Instructions
FLEX Ex I/O 24V DC 4 Non-Isolated Source
Output Module
Catalog Number 1797-OB4D
Topic
Page
Important User Information
2
Installation in Zone 1
5
Installation on Zone 22
5
Module Installation
3
Outputs
9
Wire to a 1797-TB3 or 1797-TB3S Terminal Base Unit
10
Ground the Module
12
Indicators
12
Memory Mapping
13
Field Descriptions
13
Repair
15
Specifications
16
Cooperative Operation of the ControlNet Ex Adapter and FLEX Ex
Output Modules
18
FLEX Ex Output Module Operation
20
Entity Parameters
20
Output Voltage versus Current Capability
30
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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.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, and recognize the consequence
SHOCK HAZARD
Labels may be located on or inside the equipment to alert people that dangerous voltage
may be present.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 3
Module Installation
2
1
3
4
5
6
8
7
40231
Label here or under here
Component identification
1
FlexBus connector
5
Terminal base unit
2
Latching mechanism
6
Alignment groove
3
Keyswitch
7
Alignment bar
4
Cap plug
8
Module
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Install the Module
ATTENTION
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 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.
This module must be used with a 1797-TB3 or 1797-TB3S intrinsically safe
terminal base unit.
1. Rotate keyswitch (3) on terminal base unit (5) clockwise to position 7
as required for this type of module.
Do not change the position of the keyswitch after wiring the
terminal base unit
2. Make certain 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 unit.
4. Position the module (8) with its alignment bar (7) 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 (2) is locked into
the module.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 5
6. Make certain that you only connect terminal base units to other
intrinsically safe system modules or adapters to maintain the integrity
of the intrinsically-safe backplane.
41307
7. Remove the cap plug (4) and attach another intrinsically safe terminal
base unit to the right of this terminal base unit if required.
Installation in Zone 1
This module must not be exposed to the environment and must have a
suitable metal enclosure. It has a protection factor of IP20.
WARNING
This module cannot be used in an intrinsically safe environment after it has
been exposed to nonintrinsically safe signals.
Installation on Zone 22
When the module is installed in Zone 22, the following cabinets must be used:
IVK-ISRPI-V16LC; IVK-ISRPI-V8HYW; or IVK-ISRPI-V8LC. These
cabinets can be purchased from:
Pepperl+Fuchs GmbH
Lilienthalstrasse 200
68307 Mannheim, Germany
Attn: PA Sales Dept.
Kirsten Becker
Telephone +49 776 1298
www.pepperl-fuchs.com
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The IS-RPI cabinets (type IVK2-ISRPI-V8LC, IVK2-ISRPI-V8HYW, or
IVK2-ISPRI-V16LC) ensures the basic protection for the intrinsically safe
apparatus of the FLEX Ex system for use in Zone 22. It corresponds with
category 3D according to RL 94/9 EG and with the type label marked with
the following information:
Pepperl+Fuchs GmbH
68307 Mannheim
IVK2-ISRPI-V8LC (or IVK2-ISRPI-V8HYW or
IVK2-ISRPI-V16LC)
II 3 D Ex tD A22 IP54 T70 °C X
CE
Serial (manufacturing) number
Model
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this module:
WARNING Avoid electrostatic charging.
ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO DE CARGA
ELETROSTÁTICA.
For your convenience, a sign that can be cut out is included in this installation
instruction.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 7
Removal and Insertion Under Power
WARNING
These modules are designed so you can remove and insert them under
power. However, take special care when removing or inserting modules in an
active process. I/O attached to any module being removed or inserted can
change states due to its input/output signal changing conditions.
If you insert or remove the terminal base 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.
European Communities (EC) Directive Compliance
If this product has the CE mark it is approved for installation within the
European Union and EEA regions. It has been designed and tested to meet
the following directives.
EMC Directive
These products are tested to meet the Council Directive 2014/30/EU by
applying the following standards:
• EN 61000-6-4:2007, Electromagnetic Compatibility (EMC) - Part 6-4:
Generic Standard for Industrial Environments (Class A)
• EN 61000-6-2:2005, Electromagnetic Compatibility (EMC) - Part 6-2:
Generic Standards - Immunity for Industrial Environments
• EN 61326-1:2013 (Industrial), Electrical Equipment For
Measurement, Control, and Laboratory Use - Industrial EMC
Requirements
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European Hazardous Location Approval
The following applies to products marked
II (1)2 G and
II (1) D
• Are Equipment Group II, Equipment Category (1)2, and comply with
the Essential Health and Safety Requirements relating to the design
and construction of such equipment given in Annex II to Directive
2014/34/EU. See the EC Declaration of Conformity at
http://www.rockwellautomation.com/products/certification
for details.
• The type of protection is “Ex ib[ia] IIC T4” and “[Ex iaD]” according
to EN 60079-11.
• Comply to Standards EN 60079-0:2006, EN 60079-11:2007,
EN 60079-26:2004, EN 61241-0:2006, and EN 61241-11:2006,
reference certificate number DMT 02 ATEX E 040 X.
• Are intended for use in areas in which explosive atmospheres caused
by gases, vapors, mists, or air are likely to occur occasionally. Such
locations correspond to Zone 1 or 2 classification according to ATEX
directive 2014/34/EU.
IEC Hazardous Location Approval
The following applies to products with the IECEx certification:
• Are intended for use in areas in which explosive atmospheres caused
by gases, vapors, mists, or air are likely to occur only infrequently and
for short periods. Such locations correspond to Zone 1 or 2
classification to IEC 60079-0.
• The type of protection is “Ex ib[ia] IIC T4” and “[Ex iaD]” according
to IEC 60079-11.
• Comply to Standards IEC 60079-0:2004, IEC 60079-11:2006,
IEC 60079-26:2004, IEC 61241-0:2004, and IEC 61241-11:2005,
reference IECEx certificate number IECEx BVS 09.0024X.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 9
Special Conditions for Safe Use:
The intrinsically safe circuits (ch0 to ch4) may extend into areas with
combustible dust. However it shall be ensured that the apparatus, connected
to these intrinsically safe circuits, meet the requirements for category 1D
respectively 2D and are marked accordingly.
All the other intrinsically safe circuits may also extend into areas with
combustible dust. However it shall be ensured that the apparatus, connected
to these intrinsically safe circuits, meet the requirements for category 2D and
are marked accordingly.
The module may only be used with the terminal base type 1797-TB3/* or
type 1797-TB3S/* (DMT 98 ATEX E012U)
A warning label shall be installed in immediate proximity of these apparatus:
ATTENTION! Avoid electrostatic charging.
Outputs
Each output can operate a digital field device.
Do not apply any nonintrinsically safe signals to this module.
When using an intrinsically safe electrical apparatus according to EN50020,
the European Community directives and regulations must be followed.
The channels in this module are electrically connected to each other.
+V
-V
Power
supply
+
FlexBus
- Valve
Bus
Audible
alarm
Solenoid
uC
40069
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Wire to a 1797-TB3 or 1797-TB3S Terminal Base Unit
Connect wiring to the terminal base as shown below.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Row A
+
_
+
CH 0
_
+
CH 1
_
+
CH 2
_
CH 3
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
Row B
Row C
+V -V
+V -V
No connections allowed to terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36, 37, 38, 39,
46, 47, 48, 49.
40068A
1. Connect the individual output wiring to (+) terminals (0, 4, 8, 12) on
the 0…15 row (A) as indicated in the table below.
2. Connect the associated output to the corresponding (-) terminal (1, 5,
9, 13) on the 0…15 row (A) for each output as indicated in the table
below.
3. Connect +V DC power to terminal 34 on the 34…51 row (C).
4. Connect -V to terminal 35 on the 34…51 row (C).
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 11
WARNING
Make certain that you power this module with an intrinsically safe power
supply. Do not exceed the values listed in the specifications for this module.
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.
5. If continuing power to the next terminal base unit, connect a jumper
from terminal 50 (+V) on this base unit to terminal 34 on the next
base unit.
6. If continuing common to the next terminal base unit, connect a
jumper from terminal 51 (-V) on this base unit to terminal 35 on the
next base unit.
Module Wire Connections
Output
Output +
Output -
Output 0
A-0
A-1
Output 1
A-4
A-5
Output 2
A-8
A-9
Output 3
A-12
A-13
+V
Terminals C-34 and C-50
-V
Terminals C-35 and C-51
ATTENTION
Do not use the unused terminals on this terminal base unit. Using
these terminals as supporting terminals can result in damage to the
module or unintended operation of your system, or both.
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Ground the Module
All I/O wiring must use shielded wire. Shields must be terminated external to
the module, such as bus bars and shield-terminating feed throughs.
Shield terminating
feed-through
Bus bar
30820-M
Indicators
Ex
1797-OB4D
PWR
A
B
C
A = Status indicators
B = Insertable labels for writing individual input designations
C = Power indicator (green indicates power applied to the module)
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40067
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 13
Status Indicators
Indicator
Status Description
Yellow
Individual input present
Flashing red
Channel fault
Solid red
Module did not pass power up check
Channel 0 is solid red while power-up check is running
Memory Mapping
Dec
Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Oct
Bit
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Read 0
OVL
3
OVL
2
OVL
1
OVL
0
F3
F2
F1
F0
Write 0
Out
Enb
L
DA
3
DA
2
DA
1
DA
0
FS
3
FS
2
FS
1
FS
0
D3
D2
D1
D0
Configuration 1
Where:
RA
Alarm Filter
Ch 0…3
OVL = Overload alarm for individual channel
F = Fault alarm for individual channel
DA = Detect Alarms, Detection of Output faults (0 = Disable, 1 = Enable)
FS = Fault state (0 is reset and 1 is hold last state)
D = Data, Output data 0 = Off 1 = On
L = Latch alarms (0 = Disable, 1 = Enable)
Out Enb = Output Enable
RA = Reset Alarms (0 = Normal, 1 = Reset)
Field Descriptions
Field
Description
Fault Alarm
0 = No fault
1 = Wire-off fault or overload
100 Hz (10 ms) filter is integrated
Note: A wire-off fault or overload can be detected using this single bit.
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Field Descriptions
Overload Alarm
0 = No fault
1 = Output channel overloaded
(Load resistance range 30…5000 Ω)
100 Hz (10 ms) filter is integrated
Data
Output data
0 = Off
1 = On
Default = 0
Fault State
0 = Output goes to 0 during fault
1 = Hold last state
Default = 0
Detect Alarms
These bits can be used to activate/deactivate wire-off detection and
overload monitoring of the outputs for each channel.
0 = Wire-off detection/overload monitoring deactivated
1 = Wire-off detection/overload monitoring activated
Note: Leakage current will be present when output is at 0 state if Wire Off
detection is activated. The normal load range is defined as 30 Ω…5 kΩ. In
this range, no faults will occur. Wire off is assured to be reported for loads
> 75 kΩ. It does not matter if the output is OFF or ON.
Latch Alarms
This bit defines for all channels, whether, in the event of a wire off or overload
fault, the corresponding fault bit (Overload Alarm, Fault Alarm) remains set
until the Reset Alarms bit in the configuration data word is reset by the user.
This ensures that a fault message is sent to the control system in the event of
a fault that is short in duration. The alarms should be latched if the Latch
Alarms bit is 1 and the outputs go to 0 state until the Reset Alarm occurs.
0 = Alarms and outputs are automatically reset
1 = Alarms and outputs are blocked and must be reset by setting the bit
Reset Alarms through the user program.
Default = 0
Outputs Enable
0 = Outputs disabled
1 = Outputs enabled
Default = 0
This bit must be set to 1 by the program for normal operation of the
outputs. When set to 0 the outputs will follow the Fault State status.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 15
Field Descriptions
Alarm Filter
These 3 bits are used to set the time constant of the fault/overload alarm
filter for channels 0…3.
Default = 0
Reset Alarms
Value Binary
Time constant
000
0.25 ms (Hardware)
001
0.5 ms
010
1 ms
011
2 ms
100
4 ms
101
8 ms
110
16 ms
111
32 ms
With this bit, wire off/overload faults are reset and the latch condition of
the outputs cancelled. See Latch Alarms (LA). To reset the wire
off/overload faults set the RA bit to 1 and back to 0. The reset will not
occur until a 0 > 1 > 0 transition occurs.
RSLogix 5000 Software Tip: The Reset Alarms bit is found in the Module
Configuration word. Program a Module Reconfigure typed MSG to set and
then clear the RA bit.
0 = Normal
1 = Reset
Default: 0
Repair
This module is not field-repairable. Any attempt to open this module will void
the warranty and IS certification. If repair is necessary, return this module to
the factory.
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16 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Specifications
General
Attribute
Value
Number of outputs
4, nonisolated, sourcing
IS output type
Ex ia IIB/IIC T4,
AEx ia IIC T4,
Class I, II, III Division 1 Groups A, B, C, D, E, F, G T4
IS module type
Ex ib IIB/IIC T4,
AEx ib IIC T4,
Class I Division 1 Groups A…D T4
V-I Characteristics
Refer to Output Voltage versus Current Capability on
page 30
Load range
30…5000 Ω
Fault detection
Fault bits in data table and LED (per channel)
blinking red (1 Hz)
Electronic protection
Lead break, overload, short circuit
Maximum output delay times
OFF to ON
ON to OFF
<1.2 ms
<1.2 ms
Indicators
4 yellow status indicators
4 red fault indicators
1 green module power indicator
Output (intrinsically safe)
(16 pin male and female
FlexBus connector)
Ui < 5.8V DC
Ii < 400 mA
Li = Negligible
Ci < 1.35 μF
Isolation path
Output to power supply
Output to FlexBus
Power supply to FlexBus
Output to output
Isolation type
Galvanic to DIN EN 60079-11
Galvanic to DIN EN 60079-11
Galvanic to DIN EN 60079-11
None
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 17
General
Power supply
(+V, -V Intrinsically safe)
Ui < 9.5V DC
Ii < 1 A
Li = Negligible
Ci = Negligible
Module field-side
power consumption
7.5 W
Power dissipation
5W
Thermal dissipation
17.07 BTU/hr
Module location
1797-TB3 or 1797-TB3S Terminal base unit
Conductors wire size, max
4 mm2 (12 gauge) stranded
1.2 mm (3/64 in.) insulation
Dimensions
HxWxD
46 x 94 x 75 mm
(1.8 x 3.7 x 2.95 in.)
Weight, approx.
200 g (7.05 oz.)
Keyswitch position
7
Environmental Specification
Attribute
Value
Temperature, operating
-20…+70 °C (-4…+158 °F)
Temperature, storage
-40…+85 °C (-40…+185 °F)
Relative humidity
5…95% noncondensing
Shock, operating
Tested to 15 g peak acceleration, 11(+1) ms pulse width
Shock, nonoperating
Tested to 15 g peak acceleration, 11(+1) ms pulse width
Vibration
Tested 2 g @ 10…500 Hz per IEC68-2-6
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18 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Certifications
Certifications when product
Value
is marked (1)
CENELEC
II (1) 2G Ex ib[ia] IIC T4
II (1) D [Ex iaD]
UL, C-UL
Class I, Groups A, B, C and D; Class II, Groups E, F and
G; Class III Hazardous Locations
Class I, Zone 1, AEx ib[ia] IIC T4.
FM
Intrinsically safe Class I, Div 1, Groups A, B, C, D, T4.
Associated Apparatus with instrincally safe
connections Class I, II, III, Div 1, Groups A-G.
Intrinsically safe Class I, Zone 1, AEx ib[ia] IIC T4.
INMETRO
BR-Ex ia/ib IIB/IIC T4
IECEx
[Zone 0] Ex ib[ia] IIC T4
[Ex iaD]
(1)
See the Product Certification link at http://www.ab.com for Declaration of Conformity, Certificates,
and other certification details.
Cooperative Operation of the ControlNet Ex Adapter and FLEX Ex
Output Modules
The ControlNet Ex adapter (1797-ACNR15) combined with FLEX Ex
output module provides a two-tier fault state mechanism. It is important to
consider and understand the operation of this mechanism when designing
your system.
Two sets of programmable fault states are available, one each in the adapter
and output module. This two-tier method is meant to give you a wider fault
coverage compared with normal methods.
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Adapter Operation
Network Communication Monitoring
The adapter is the primary monitor of network activity. If it detects loss of
network communication, it can be programmed to:
• continue writing the last valid received data to the module (hold last
state).
• apply local module safe states.(1)
• write a programmable fault state value to the module, depending upon
the module type.(2)
This mechanism primarily targets fault behavior for loss of network
communication.
Program Mode Behavior
The adapter also monitors the state of the controlling processor or scanner.
Two states can be detected: Run mode and Program mode (idle).
When Program mode is detected, the adapter can be configured to:
• continue writing the last valid received data to the module (hold last
state).
• apply local module safe states to zero.(1)
• write a programmable fault state value to the module, depending upon
the module type.(2)
(1)
This selection is shown as Reset Outputs in RSNetWorx software, but its action is Apply Local Module
Safe States.
(2)
This option is only available in some adapters.
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20 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
FLEX Ex Output Module Operation
The following describes the output module operation.
Flexbus Communication Monitoring
The module monitors FlexBus communication activity and the state of its
Output Enable bit. If it detects loss of FlexBus communication activity or the
Output Enable bit transitioning to 0, it can be programmed to:
• continue writing the last valid received data to the outputs (hold last
state).
• reset the outputs.
• write the local module fault state value to the output, depending upon
the module type.
This mechanism primarily targets fault behavior for loss of backplane
communication.
Power-up State Behavior
The system and modules use the Output Enable bit at system power-up. The
power-up state of the Output Enable bit is 0 and must be transitioned to 1
through application program control to initialize activity of a module’s
outputs.
Before the Output Enable bit is transitioned to 1, module outputs remain off.
Once the initial power-up and application-program control transitions the
Output Enable bit to 1, and module output activity begins, subsequent
transitions of the Output Enable bit by any source will cause the output
module to apply the local module fault state.
Entity Parameters
CE, CENELEC I/O Entity Parameters
Signal output (+ to -) for ch 0…ch 3 (terminals: 0 and 1; 4 and 5; 8 and 9; 12
and 13).
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Entity Parameters
1797-OB4D
Uo = 27.4V
Io = 110 mA
Protection Group
Allowed
Allowed
Capacitance Inductance
Ex ia
IIB
677 nF
8 mH
IIC
87 nF
2 mH
IIB
150 nF
5 mH
IIC
30 nF
2 mH
If concentrated capacitance
Ex ia
and/or inductance are available,
use the following values.
The values of Lo and Co listed in the table above are allowed if one of the
following conditions is met:
• The total Li of the external circuit (excluding the cable) is < 1% of the
Lo value or
• The total Ci of the external circuit (excluding the cable) is < 1% of the
Co value.
The values of Lo and Co listed in the table above shall be reduced to 50%
when both of the following conditions are met:
• The total Li of the external circuit (excluding the cable) is ≥ 1% of the
Lo value and
• The total Ci of the external circuit (excluding the cable) is ≥ 1% of the
Co value.
Note: The reduced capacitance of the external circuit (including cable) shall
not be greater than 1µF for IIB and IIA and 600nF for IIC.
UL, C-UL I/O Entity Parameters
If this product has the UL/C-UL mark, it has been designed, evaluated,
tested, and certified to meet the following standards:
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22 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
• UL 913, 1988, Intrinsically Safe Apparatus and Associated Apparatus
for Use in Class I, II, and III Division 1, Hazardous (Classified)
Locations
• UL 1203, Explosion-Proof and Dust-Ignition-Proof Electrical
Equipment for Use in Hazardous (Classified) Locations
• UL 2279, Electrical Equipment for Use in Class I, Zone 0, 1, and 2
Hazardous (Classified) Locations
• UL 61010, UL Standard for Safety Electrical Equipment For
Measurement, Control, and Laboratory Use; Part 1: General
Requirements
• CSA C22.2 No. 157-92, Intrinsically Safe and Non-Incendive
Equipment for Use in Hazardous Locations
• CSA C22.2 No. 30-M1986, Explosion-Proof Enclosures for Use in
Class I Hazardous Locations
• CSA-E79-0-95, Electrical Apparatus for Explosive Gas Atmospheres,
Part 0: General Requirements
• CSA-E79-11-95, Electrical Apparatus for Explosive Gas
Atmospheres, Part 11: Intrinsic Safety “i”
• CSA C22.2 No. 14-95, Industrial Control Equipment
Wiring Methods
• Wiring method 1: Each channel is wired separately.
• Wiring method 2: Multiple channels in one cable, providing each
channel is separated in accordance with the National Electric Code
(NEC) or Canadian Electric Code (CEC).
Wiring Method
Wiring Channel
Method
Terminals Voc
(V)
Isc
(mA)
Vt
(V)
It
(mA)
Groups
Ca
(μF)
La
(mH)
1 and 2
0(+), 1(-)
110.0
-
-
A, B, IIC
0.03
2.0
C, E, IIB
0.09
8.0
D, F, G, IIA 0.24
16.0
Any one
channel
(for
example,
ch0)
27.4
Publication 1797-IN006H-EN-P - August 2017
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 23
Ex
1797-OB4D
FLEX Ex digital
output I/O module
Key position for
terminal base
insertion
PWR
Indicators
Female bus
connection
Male bus
connection
Terminal base
key
Terminal base
Field wiring
terminals
IMPORTANT
42058
A terminal base may or may not have an I/O module installed.
Publication 1797-IN006H-EN-P - August 2017
24 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Hazardous (Classified) Location
Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
Class II, Div. 1 & 2 Groups E, F, G
Class III, Div. 1 & 2
Any Simple Apparatus  or I.S.
device with Entity Concept
parameters  (Vmax, Imax, Ci, Li)
appropriate for connection to
associated apparatus with Entity
Concept parameters listed in the
table, Terminal Connections.

Hazardous (Classified) Location
Class I, Zones 1 & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
ch0
ch1

0 (+)
1 (-)
Female Bus
Connector
4 (+)
5 (-)
Vmax=5.8V
Imax=400mA
Ci=1350nF
Li=negligible
ch2
8 (+)
9 (-)
ch3
12 (+)
13 (-)
Vmax=9.5V
Imax=1A
Ci=negligible
Li=negligible
34

To any intrinsically safe
device or associated
apparatus with Entity
Concept  parameters of
Voc < 5.8V; Isc < 400 mA.
To any intrinsically safe
device or associated
apparatus with Entity
Concept  parameters of
Voc < 9.5V; Isc < 1 A.
35
51
50
 To any IS device with Entity
Concept  parameters of
(Vmax, Imax, Ci, Li) appropriate
for connection to associated
apparatus with Entity Concept
parameters listed in the table,
Wiring Method.
Male Bus
Connector
 
1797-OB4D
16
33
40
41
42
43
44
45
Shield connection only
42059
Terminal Connections
Terminals
Vt (V)
It (mA)
Groups
Ca (μF)
La (μH)
Male bus
connector
5.8
400
A to G
3.0
3.0
The entity concept allows interconnection of intrinsically safe apparatus
with associated apparatus not specifically examined in combination as a
system when the approved values of Voc and Isc or Vt and It of the associated
apparatus are less than or equal to Vmax and Imax of the intrinsically safe
apparatus and the approved values of Ca and La of the associated apparatus
are greater than Ci + Ccable and Li + Lcable respectively for the intrinsically safe
apparatus. The internal capacitances Ci of the terminal base must be taken
into account to verify the intrinsic safety.
Publication 1797-IN006H-EN-P - August 2017
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 25
The values of Lo and Co listed in the table above are allowed if one of the
following conditions is met:
• The total Li of the external circuit (excluding the cable) is < 1% of the
Lo value or
• The total Ci of the external circuit (excluding the cable) is < 1% of the
Co value.
The values of Lo and Co listed in the table above shall be reduced to 50%
when both of the following conditions are met:
• The total Li of the external circuit (excluding the cable) is ≥ 1% of the
Lo value, and
• The total Ci of the external circuit (excluding the cable) is ≥ 1% of the
Co value.
Note: The reduced capacitance of the external circuit (including cable) shall
not be greater than 1µF for IIB and IIA and 600nF for IIC.
Simple apparatus is defined as a device which neither generates nor stores
more than 1.2V, 0.1 A, 20 μJ, or 25 mW.
Wiring methods must be in accordance with the National Electric Code,
ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA
C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA
RP12.6.
This module, 1797-OB4D, must be used with terminal base 1797-TB3 or
1797-TB3S.
Terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36 to 39, and 46 to 49 shall
not be connected.
WARNING: Substitution of components may impair intrinsic safety.
AVERTISSEMENT: La substitution de composant peut compromettre la
securite intrinseque.
Publication 1797-IN006H-EN-P - August 2017
26 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
FM I/O Entity Parameters
If this product has the FM mark, it has been designed, evaluated, tested, and
certified to meet the following standards:
• FM C1. No.3600:1998, Electrical Equipment for Use in Hazardous
(Classified) Locations General Requirements
• FM C1. No.3610:1999, Intrinsically Safe Apparatus and Associated
Apparatus for Use in Class I, II, III Division 1 Hazardous (Classified)
Locations
• FM C1. No.3615:1989, Explosionproof Electrical Equipment General
Requirements
• FM C1. No.3810:1989, 1995, Electrical and Electronic Test,
Measuring and Process Control Equipment
• ANSI/NEMA 250, 1991, Enclosures for Electrical Equipment
Wiring Methods
• Wiring method 1: Each channel is wired separately.
• Wiring method 2: Multiple channels in one cable, providing each
channel is separated in accordance with the National Electric Code
(NEC).
Wiring Method
Wiring Channel
Method
Terminals Voc
(V)
Isc
(mA)
Vt
(V)
It
(mA)
Groups
Ca
(μF)
La
(mH)
1 and 2
0(+), 1(-)
110.0
-
-
A, B
0.105
3.0
C, E
0.315
9.0
D, F, G
0.840
24.0
Any one
channel
(for
example,
ch0)
27.4
Publication 1797-IN006H-EN-P - August 2017
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 27
Ex
1797-OB4D
FLEX Ex digital
output I/O module
Key position for
terminal base
insertion
PWR
Indicators
Female bus
connection
Male bus
connection
Terminal base
key
Terminal base
Field wiring
terminals
IMPORTANT
42058
A terminal base may or may not have an I/O module installed.
Publication 1797-IN006H-EN-P - August 2017
28 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Hazardous (Classified) Location
Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
Class II, Div. 1 & 2 Groups E, F, G
Class III, Div. 1 & 2
Any Simple Apparatus  or FM
approved device with Entity Concept
parameters  (Vmax, Imax, Ci, Li)
appropriate for connection to
associated apparatus with Entity
Concept parameters listed in the table,
Terminal Connections.

Hazardous (Classified) Location
Class I, Zones 1 Groups IIC, IIB, IIA
Class I, Div. 1 Groups A, B, C, D

ch0
0 (+)
1 (-)
ch1
4 (+)
5 (-)
ch2
ch3
For connection to other
modules refer to the General
FM Certification Information
on page 29-1 of 1797-RM001.
Female Bus
Connector
Vmax=5.8V
Imax=400mA
Ci=1350nF
Li=negligible
34
Vmax=9.5V
Imax=1A
Ci=negligible
Li=negligible
8 (+)
9 (-)

From FM approved devices,
1797-PS2N.
35
51
12 (+)
13 (-)
50

For connection to other
modules refer to the General
FM Certification Information on
page 29-1 of 1797-RM001.
Male Bus
Connector
16
   33
40
1797-OB4D 41
42
Shield connection only
43
44
45
42059
Terminal Connections
Terminals
Male bus
connector
Vt (V)
5.8
It (mA)
400
Groups
A…G
Ca (μF)
3.0
La (μH)
3.0
The entity concept allows interconnection of intrinsically safe apparatus
with associated apparatus not specifically examined in combination as a
system when the approved values of Voc and Isc or Vt and It of the associated
apparatus are less than or equal to Vmax and Imax of the intrinsically safe
apparatus and the approved values of Ca and La of the associated apparatus
are greater than Ci + Ccable and Li + Lcable respectively for the intrinsically safe
apparatus.
Publication 1797-IN006H-EN-P - August 2017
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 29
The values of Lo and Co listed in the table above are allowed if one of the
following conditions is met:
• The total Li of the external circuit (excluding the cable) is < 1% of the
Lo value or
• The total Ci of the external circuit (excluding the cable) is < 1% of the
Co value.
The values of Lo and Co listed in the table above shall be reduced to 50%
when both of the following conditions are met:
• The total Li of the external circuit (excluding the cable) is ≥ 1% of the
Lo value, and
• The total Ci of the external circuit (excluding the cable) is ≥ 1% of the
Co value.
Note: The reduced capacitance of the external circuit (including cable) shall
not be greater than 1µF for IIB and IIA and 600nF for IIC.
Simple apparatus is defined as a device which neither generates nor stores
more than 1.2V, 0.1 A, 20 μJ, or 25 mW.
Wiring methods must be in accordance with the National Electric Code,
ANSI/NFPA 70, Article 504 and 505. For additional information refer to
ANSI/ISA RP12.6.
This module, 1797-OB4D, must be used with terminal base 1797-TB3 or
1797-TB3S.
Terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36 to 39, and 46 to 49 shall
not be connected.
WARNING: Substitution of components may impair intrinsic safety.
Publication 1797-IN006H-EN-P - August 2017
30 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Output Voltage versus Current Capability
Voltage
30
25
20
15
10
5
0
0
IMPORTANT
5
10
15
20
25
mA
30
35
40
45
50
41313
For detailed certification information, refer to the FLEX Ex System
Certification Reference Manual, publication 1797-RM001.
WARNING Avoid electrostatic charging.
ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO
DE CARGA ELETROSTÁTICA.
Publication 1797-IN006H-EN-P - August 2017
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 31
Publication 1797-IN006H-EN-P - August 2017
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Rockwell Automation provides technical information on the Web to assist you in using
its products. At http://support.rockwellautomation.com, you can find technical
manuals, a knowledge base of FAQs, technical and application notes, sample code and
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For an additional level of technical phone support for installation, configuration, and
troubleshooting, we offer TechConnect Support programs. For more information,
contact your local distributor or Rockwell Automation representative, or visit
http://support.rockwellautomation.com.
Installation Assistance
If you experience a problem with a hardware module within the first 24 hours of
installation, please review the information that's contained in this manual. You can also
contact a special Customer Support number for initial help in getting your module up
and running.
United States
1.440.646.3434 Monday – Friday, 8am – 5pm EST
Outside United States
Please contact your local Rockwell Automation representative for
any technical support issues.
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Contact your distributor. You must provide a Customer Support case
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in order to complete the return process.
Outside United States
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return procedure.
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Trademarks not belonging to Rockwell Automation are property of their respective companies.
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Publication 1797-IN006H-EN-P - August 2017
Supersedes Publication 1797-IN006G-EN-P - June 2011
PN-455783
Copyright © 2017 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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