Allen-Bradley FLEX Ex 1797-OB4D Installation Instructions Manual
Allen-Bradley FLEX Ex 1797-OB4D is a 4-channel, 24VDC, non-isolated source output module designed for use in hazardous locations. It can be used to control digital field devices such as valves, solenoids, and audible alarms. The module is intrinsically safe and can be used in Zone 1 and Zone 22 hazardous areas. It has a protection factor of IP20 and must be installed in a suitable metal enclosure. The module is hot-swappable, allowing for easy removal and insertion under power. It is also compliant with the European Communities (EC) Directive and the ATEX Directive.
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Installation Instructions
FLEX Ex I/O 24V DC 4 Non-Isolated Source
Output Module
Catalog Number 1797-OB4D
Topic
Important User Information
Installation in Zone 1
Installation on Zone 22
Module Installation
Outputs
Wire to a 1797-TB3 or 1797-TB3S Terminal Base Unit
Ground the Module
Indicators
Memory Mapping
Field Descriptions
Repair
Specifications
Cooperative Operation of the ControlNet Ex Adapter and FLEX Ex
Output Modules
FLEX Ex Output Module Operation
Entity Parameters
Output Voltage versus Current Capability
18
19
29
12
14
15
17
11
11
12
3
8
9
Page
2
5
5
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2 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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
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.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
ATTENTION
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
1
2
3
4
5
6
8
Label here or under here
3
4
Component identification
1 FlexBus connector
2 Latching mechanism
Keyswitch
Cap plug
7
8
5
6
Terminal base unit
Alignment groove
Alignment bar
Module
7
40231
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4 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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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6 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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 2004/108/EC 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
• EN61326-1:2006 (Industrial), Electrical Equipment For
Measurement, Control, and Laboratory Use - Industrial EMC
Requirements
ATEX Directive
These products are tested in conjunction with associated I/O modules to meet the Council Directive 94/9/EC (ATEX) Equipment and Protective
Systems Intended for Use in Potentially Explosive Atmospheres by applying the following standards:
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8 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
• EN60079-11:2007, Explosive atmospheres - Part 11 : equipment protection by intrinsic safety "i"
• EN60079-0:2006, Electrical apparatus for explosive gas atmospheres -
Part 0 : general requirements
• EN 60079-26 : 2004, Electrical apparatus for explosive gas atmospheres - Part 26 : construction, test and marking of Group II
Category 1 G electrical apparatus
• EN61241-0 : 2006, Electrical apparatus for use in the presence of combustible dust - Part 0: General requirements
• EN61241-11:2006, Electrical apparatus for use in the presence of combustible dust – Part 11: Protection by intrinsic safety 'iD'
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.
FlexBus
Bus uC
+V
-V
+
Power supply
-
Valve
Audible alarm
Solenoid
40069
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 9
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
_
16 17 18 19
+
CH 1
_
20 21 22 23
+
CH 2
_
24 25 26 27
+
CH 3
_
28 29 30 31 32 33
Row B
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
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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10 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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 0
Output 1
Output 2
Output 3
+V
-V
Output +
A-0
A-4
A-8
A-12 A-13
Terminals C-34 and C-50
Terminals C-35 and C-51
Output -
A-1
A-5
A-9
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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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 11
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.
Indicators
Bus bar
Shield terminating feed-through
30820-M
Ex
1797-OB4D
A B C
A = Status indicators
B = Insertable labels for writing individual input designations
C = Power indicator (green indicates power applied to the module)
40067
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12 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Status Indicators
Indicator
Yellow
Flashing red
Solid red
Status Description
Individual input present
Channel fault
Module did not pass power up check
Channel 0 is solid red while power-up check is running
Memory Mapping
Dec
Bit
Oct
Bit
Read 0
15
17
14
16
13
15
12
14
11 10 09 08
13 12 11 10
Write 0
Configuration 1
OVL
3
Out
Enb
OVL
2
L
OVL
1
OVL
0
F3 F2 F1 F0
DA
3
DA
2
DA
1
DA
0
RA
07 06 05 04 03 02 01 00
07
FS
3
06
FS
2
05
FS
1
04
FS
0
03
D3
02
D2
01
D1
Alarm Filter
Ch 0…3
00
D0
Where: 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
Fault Alarm
Description
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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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 13
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
Fault State
Output data
0 = Off
1 = On
Default = 0
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
Latch Alarms
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 k Ω . In this range, no faults will occur. Wire off is assured to be reported for loads
> 75 k Ω . It does not matter if the output is OFF or ON.
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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14 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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
101
110
111
010
011
100
Value Binary
000
001
Time constant
0.25 ms (Hardware)
0.5 ms
1 ms
2 ms
4 ms
8 ms
16 ms
32 ms
Reset Alarms 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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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 15
Specifications
General
Attribute
Number of outputs
IS output type
IS module type
V-I Characteristics
Load range
Fault detection
Electronic protection
Maximum output delay times
OFF to ON
ON to OFF
Indicators
Output (intrinsically safe)
(16 pin male and female
FlexBus connector)
Value
4, nonisolated, sourcing
Ex ia IIB/IIC T4,
AEx ia IIC T4,
Class I, II, III Division 1 Groups A, B, C, D, E, F, G T4
Ex ib IIB/IIC T4,
AEx ib IIC T4,
Class I Division 1 Groups A…D T4
Refer to Output Voltage versus Current Capability on page 29
30…5000 Ω
Fault bits in data table and LED (per channel) blinking red (1 Hz)
Lead break, overload, short circuit
<1.2 ms
<1.2 ms
4 yellow status indicators
4 red fault indicators
1 green module power indicator
U i
< 5.8V DC
I i
< 400 mA
L i
= Negligible
C i
< 1.35 μ F
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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16 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
General
Power supply
(+V, -V Intrinsically safe)
U i
< 9.5V DC
I i
< 1 A
L i
= Negligible
C i
= Negligible
7.5 W Module field-side power consumption
Power dissipation
Thermal dissipation
Module location
Conductors wire size, max
Dimensions
HxWxD
Weight, approx.
Keyswitch position
5 W
17.07 BTU/hr
1797-TB3 or 1797-TB3S Terminal base unit
4 mm 2 (12 gauge) stranded
1.2 mm (3/64 in.) insulation
46 x 94 x 75 mm
(1.8 x 3.7 x 2.95 in.)
200 g (7.05 oz.)
7
Environmental Specification
Attribute
Temperature, operating
Temperature, storage
Relative humidity
Shock, operating
Shock, nonoperating
Vibration
Value
-20…+70
°
C (-4…+158
°
F)
-40…+85
°
C (-40…+185
°
F)
5…95% noncondensing
Tested to 15 g peak acceleration, 11(+1) ms pulse width
Tested to 15 g peak acceleration, 11(+1) ms pulse width
Tested 2 g @ 10…500 Hz per IEC68-2-6
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 17
Certifications
Certifications when product is marked
(1)
CENELEC
Value
UL, C-UL
FM
INMETRO
IECEx
II (1) 2G Ex ib[ia] IIC T4
II (1) D [Ex iaD]
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.
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.
BR-Ex ia/ib IIB/IIC T4
[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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18 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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)
FLEX Ex Output Module Operation
The following describes the output module operation.
(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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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 19
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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20 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Entity Parameters
1797-OB4D
U o
= 27.4V
I o
= 110 mA
If concentrated capacitance and/or inductance are available, use the following values.
Ex ia
Protection Group Allowed
Capacitance
Ex ia IIB
IIC
677 nF
87 nF
IIB
IIC
150 nF
30 nF
Allowed
Inductance
8 mH
2 mH
5 mH
2 mH
The values of L o
and C o
listed in the table above are allowed if one of the following conditions is met:
• The total L i
of the external circuit (excluding the cable) is < 1% of the
L o
value or
• The total C i
of the external circuit (excluding the cable) is < 1% of the
C o
value.
The values of L o
and C o
listed in the table above shall be reduced to 50% when both of the following conditions are met:
• The total L i
of the external circuit (excluding the cable) is ≥ 1% of the
L o
value and
• The total C i
of the external circuit (excluding the cable) is ≥ 1% of the
C o
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:
• UL 913, 1988, Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III Division 1, Hazardous (Classified)
Locations
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 21
• 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
Method
Channel Terminals V oc
(V)
0(+), 1(-)
I sc
(mA)
27.4
110.0
1 and 2 Any one channel
(for example, ch0)
V t
(V)
-
I t
(mA)
Groups C a
(
μ
F)
L a
(mH)
A, B, IIC 0.03
2.0
C, E, IIB 0.09
8.0
D, F, G, IIA 0.24
16.0
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22 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
FLEX Ex digital output I/O module
Indicators
Ex
1797-OB4D
Key position for terminal base insertion
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.
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FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 23
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 (V max
, I max
, C i
, L appropriate for connection to i
) associated apparatus with Entity
Concept parameters listed in the table, Terminal Connections.
ch0 ch1 ch2 ch3
Hazardous (Classified) Location
Class I, Zones 1 & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
0 (+)
1 (-)
4 (+)
5 (-)
8 (+)
9 (-)
12 (+)
13 (-)
Female Bus
Connector
V max
I max
=5.8V
=1350nF
=400mA
C i
L i
=negligible
34
V max
I max
C i
=9.5V
=1A
=negligible
L i
=negligible
35
51
50
Male Bus
Connector
To any intrinsically safe device or associated apparatus with Entity
Concept parameters of
V oc
< 5.8V; I sc
< 400 mA.
T o any intrinsically safe device or associated apparatus with Entity
Concept parameters of
V oc
< 9.5V; I sc
< 1 A.
To any IS device with Entity
Concept parameters of
(V max
, I max
, C i
, L i
) appropriate for connection to associated apparatus with Entity Concept parameters listed in the table,
Wiring Method.
1797-OB4D
16
33
40
41
42
43
44
45
Shield connection only
42059
Terminal Connections
Terminals
Male bus connector
V t
(V)
5.8
I t
(mA)
400
Groups
A to G
C a
( μ F)
3.0
L a
( μ H)
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 V oc
and I sc or V t
and I t
of the associated apparatus are less than or equal to V max
and I apparatus and the approved values of C a max
and L a
of the intrinsically safe
of the associated apparatus are greater than C i
+ C cable
and L i
+ L cable
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 1797-5.6 - June 2011
24 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
The values of L o
and C o
listed in the table above are allowed if one of the following conditions is met:
• The total L i
of the external circuit (excluding the cable) is < 1% of the
L o
value or
• The total C i
of the external circuit (excluding the cable) is < 1% of the
C o
value.
The values of L o
and C o
listed in the table above shall be reduced to 50% when both of the following conditions are met:
• The total L i
of the external circuit (excluding the cable) is ≥ 1% of the
L o
value, and
• The total C i
of the external circuit (excluding the cable) is ≥ 1% of the
C o
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 μ J, 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.
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:
Publication 1797-5.6 - June 2011
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 25
• 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
Method
Channel Terminals V oc
(V)
0(+), 1(-)
I sc
(mA)
27.4
110.0
1 and 2 Any one channel
(for example, ch0)
V t
(V)
-
I t
(mA)
Groups C a
( μ F)
A, B
L a
(mH)
0.105
3.0
C, E
D, F, G
0.315
0.840
9.0
24.0
Publication 1797-5.6 - June 2011
26 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Ex
1797-OB4D
FLEX Ex digital output I/O module
Indicators
Key position for terminal base insertion
Female bus connection
Field wiring terminals
Male bus connection
Terminal base key
Terminal base
42058
IMPORTANT
A terminal base may or may not have an I/O module installed.
Publication 1797-5.6 - June 2011
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 27
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
(V max
, I max
, C i
, L appropriate for connection to i
) 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 ch1 ch2 ch3
0 (+)
1 (-)
4 (+)
5 (-)
8 (+)
9 (-)
12 (+)
13 (-)
Female Bus
Connector
I
V
C max
=5.8V
max
=400mA
L i i
=1350nF
=negligible
V max
I max
C i
=9.5V
=1A
=negligible
L i
=negligible
34
35
51
50
For connection to other modules refer to the General
FM Certification Information on page 29-1 of 1797-6.5.6
.
From FM approved devices,
1797-PS2N .
Male Bus
Connector
For connection to other modules refer to the General
FM Certification Information on page 29-1 of 1797-6.5.6
.
1797-OB4D
16
33
40
41
42
43
44
45
Shield connection only
42059
Terminal Connections
Terminals
Male bus connector
5.8
V t
(V) I t
(mA)
400
Groups
A…G 3.0
C a
( μ F)
3.0
L a
( μ H)
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 V oc
and I sc or V t
and I t
of the associated apparatus are less than or equal to V max
and I apparatus and the approved values of C a max
and L a
of the intrinsically safe
of the associated apparatus are greater than C i
+ C cable
and L i
+ L cable
respectively for the intrinsically safe apparatus.
Publication 1797-5.6 - June 2011
28 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
The values of L o
and C o
listed in the table above are allowed if one of the following conditions is met:
• The total L i
of the external circuit (excluding the cable) is < 1% of the
L o
value or
• The total C i
of the external circuit (excluding the cable) is < 1% of the
C o
value.
The values of L o
and C o
listed in the table above shall be reduced to 50% when both of the following conditions are met:
• The total L i
of the external circuit (excluding the cable) is ≥ 1% of the
L o
value, and
• The total C i
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 μ J, 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 1797-5.6 - June 2011
FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 29
Output Voltage versus Current Capability
Voltage
30
25
20
15
10
5
0
0 5 10 15 20 25 30 35 40 45 50 mA
41313
IMPORTANT
For detailed certification information, refer to the FLEX Ex System
Certification Reference Manual, publication 1797-6.5.6
.
WARNING Avoid electrostatic charging.
ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO
DE CARGA ELETROSTÁTICA .
Publication 1797-5.6 - June 2011
Rockwell Automation Support
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 links to software service packs, and a MySupport feature that you can customize to make the best use of these tools.
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.
New Product Satisfaction Return
Rockwell tests all of its products to ensure that they are fully operational when shipped from the manufacturing facility. However, if your product is not functioning, it may need to be returned.
United States Contact your distributor. You must provide a Customer Support case number (see phone number above to obtain one) to your distributor in order to complete the return process.
Outside United States Please contact your local Rockwell Automation representative for return procedure.
Allen-Bradley, Rockwell Automation, FLEX Ex, ControlLogix, RSLinx, and TechConnect are trademarks of
Rockwell Automation, Inc.
Publication 1797-5.6 - June 2011
Supersedes Publication 1797-5.6 - February 2006
PN -110744
Copyright © 2011 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

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