Allen-Bradley FLEX Ex 1797-OB4D User manual

Publication 1797-5.6 - June 2011
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 8
Wire to a 1797-TB3 or 1797-TB3S Terminal Base Unit 9
Ground the Module 11
Indicators 11
Memory Mapping 12
Field Descriptions 12
Repair 14
Specifications 15
Cooperative Operation of the ControlNet Ex Adapter and FLEX Ex
Output Modules
17
FLEX Ex Output Module Operation 18
Entity Parameters 19
Output Voltage versus Current Capability 29

2FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 3
Publication 1797-5.6 - June 2011
Module Installation
Component identification
1FlexBus connector 5Terminal base unit
2Latching mechanism 6Alignment groove
3Keyswitch 7Alignment bar
4Cap plug 8Module
3
5
1
8
7
6
2
Label here or under here
4
40231

4FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
Install the Module
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.
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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 5
Publication 1797-5.6 - June 2011
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.
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.
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 [phone]
www.pepperl-fuchs.com
WARNING
This module cannot be used in an intrinsically safe environment after it has
been exposed to nonintrinsically safe signals.
41307

6FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 7
Publication 1797-5.6 - June 2011
Removal and Insertion Under Power
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:
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.

8FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
•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

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 9
Publication 1797-5.6 - June 2011
Wire to a 1797-TB3 or 1797-TB3S Terminal Base Unit
Connect wiring to the terminal base as shown below.
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).
No connections allowed to terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36, 37, 38, 39,
46, 47, 48, 49.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
32 33
50 51
CH 0 CH 1 CH 2 CH 3
+_+_+_+_
+V-V+V-V
40068A
Row A
Row B
Row C

10 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
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.
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.
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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 11
Publication 1797-5.6 - June 2011
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
30820-M
Shield terminating
feed-through
Bus bar
Ex
1797-OB4D
PWR
PWR
A B C
40067
A = Status indicators
B = Insertable labels for writing individual input designations
C = Power indicator (green indicates power applied to the module)

12 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
Memory Mapping
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
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
LDA
3
DA
2
DA
1
DA
0
FS
3
FS
2
FS
1
FS
0
D3 D2 D1 D0
Configuration 1 RA Alarm Filter
Ch 0…3
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 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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 13
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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
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.
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.
Field Descriptions

14 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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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.
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 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
Field Descriptions
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

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 15
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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 29
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

16 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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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 5 W
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
General

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 17
Publication 1797-5.6 - June 2011
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.
Certifications
Certifications when product
is marked (1)
(1) See the Product Certification link at http://www.ab.com for Declaration of Conformity, Certificates,
and other certification details.
Value
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]

18 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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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)
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.

FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module 19
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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).

20 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
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The values of Loand Colisted in the table above are allowed if one of the
following conditions is met:
• The total Liof the external circuit (excluding the cable) is < 1% of the
Lovalue or
• The total Ciof the external circuit (excluding the cable) is < 1% of the
Covalue.
The values of Loand Colisted in the table above shall be reduced to 50%
when both of the following conditions are met:
• The total Liof the external circuit (excluding the cable) is ≥1% of the
Lovalue and
• The total Ciof the external circuit (excluding the cable) is ≥1% of the
Covalue.
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
Entity Parameters
Protection Group Allowed
Capacitance
Allowed
Inductance
1797-OB4D
Uo= 27.4V
Io= 110 mA
Ex ia IIB 677 nF 8 mH
IIC 87 nF 2 mH
If concentrated capacitance
and/or inductance are available,
use the following values.
Ex ia IIB 150 nF 5 mH
IIC 30 nF 2 mH