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
http://literature.rockwellautomation.com
) describes some important differences between solid state equipment and hard-wired electromechanical
devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this
equipment must satisfy themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this
equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated
with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and
diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this
manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
available from your local Rockwell Automation sales office or online at
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.
Labels may be on or inside the equipment, such as a drive or motor, to alert people that dangerous voltage may be present.
Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous
temperatures.
Allen-Bradley, Rockwell Automation, FLEX I/O, RSLinx, RSLogix 5000 and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
Preface
Introduction
Manual Set-Up
Table Preface.1
This application manual is intended to describe the FLEX I/O with ControlLogix
Control System components available from Rockwell Automation that are
suitable for use in SIL2 applications. Use this manual in conjunction with
publication 1756-RM001
Alternate architecture can be used in SIL2 applications if they are approved by
a certifying agency.
This manual is designed to make clear how the FLEX I/O with ControlLogix
Control System can be SIL2-certified. Table Preface.1 lists the information
available in each section.
Section:Title:Description:
Chapter 1SIL PolicyIntroduction to the SIL policy and how that
policy relates to FLEX I/O with a ControlLogix
system.
Chapter 2ControlLogix Communications Description of the ControlLogix communications
modules used in the SIL2-certified FLEX I/O
with ControlLogix system.
Chapter 3FLEX I/O ModulesDescription of the FLEX I/O modules used in the
SIL2-certified FLEX I/O with ControlLogix
system.
Chapter 4General Requirements for
Application Software
Application software requirements for using
ControlLogix and FLEX modules.
Chapter 5Technical SIL2 Requirements
Appendix AFailure EstimatesFailure rates based on field returns.
Understanding Terminology
for the Application Program
The following table defines acronyms used in this manual.
Table Preface.2 List of Acronyms Used Throughout the Safety Application Manual
Acronym:Full Term:Definition:
CIPControl and
Information
Protocol
DCDiagnostic
Coverage
ENEuropean Norm.The official European Standard
GSVGet System Value A ladder logic output instruction that retrieves
Guidelines for application development in
RSLogix 5000 as they relate to SIL2.
A messaging protocol used by Logix5000™
systems. It is a native communications protocol
used on ControlNet™ communications networks,
among others.
The ratio of the detected failure rate to the total
failure rate.
specified controller status information and places
it in a destination tag.
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Preface 2
Table Preface.2 List of Acronyms Used Throughout the Safety Application Manual
Acronym:Full Term:Definition:
MTBFMean Time
Average time between failure occurrences.
Between Failures
MTTRMean Time to
Restoration
Average time needed to restore normal operation
after a failure has occurred.
PADTProgramming and
Debugging Tool
RSLogix 5000 software used to program and
debug a SIL2-certified FLEX I/O with ControlLogix
application.
PCPersonal
Computer
Computer used to interface with, and control, a
ControlLogix system via RSLogix 5000
programming software.
PFDProbability of
Failure on
The average probability of a system to fail to
perform its design function on demand.
Demand
PFHProbability of
Failure per Hour
The probability of a system to have a dangerous
failure occur per hour.
1oo1One out of oneA 1oo1 (one out of one) architecture consists of a
single channel where any dangerous failure leads
to a failure of the safety function.
1oo2One out of twoA 1oo2 (one out of two) architecture consists of
two channels connected in parallel such that
either channel can process the safety function.
Publication 1794-RM001G-EN-P - December 2011
Chapter
SIL Policy
This chapter introduces you to the SIL policy and how the
ControlLogix/FLEX I/O system meets the requirements for SIL2
certification.
For information about:See page:
Introduction to SIL1-1
SIL2 Certification1-2
Proof Tests1-3
SIL2-Certified FLEX I/O System Components1-5
Hardware Designs and Firmware Functions1-8
Hardware Designs and Firmware Functions1-8
1
Introduction to SIL
Difference Between PFD and PFH1-8
SIL Compliance Distribution and Weight1-13
Response Times1-13
Certain catalog numbers (listed in Table 1.1 on page 1-5) of the FLEX I/O with
ControlLogix system are type-approved and certified for use in SIL2
applications, according to IEC 61508. SIL requirements are based on the
standards current at the time of certification.
These requirements consist of mean time between failures (MTBF),
probability of failure, failure rates, diagnostic coverage and safe failure
fractions that fulfill SIL2 criteria. The results make the ControlLogix/FLEX
I/O system suitable up to, and including, SIL2. When the
ControlLogix/FLEX I/O system is in the maintenance or programming
mode, the user is responsible for maintaining a safe state.
For support in creation of programs, the PADT (Programming and
Debugging Tool) is required. The PADT for ControlLogix/FLEX I/O is
RSLogix 5000, per IEC 61131-3, and this Safety Reference Manual.
The TUV Rheinland has approved the ControlLogix/FLEX I/O system for
use in up to and including SIL 2 safety related applications in which the
de-energized state is considered to be the safe state. All of the examples related
to I/O included in this manual are based on achieving de-energization as the
safe state for typical Emergency Shutdown (ESD) Systems.
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1-2 SIL Policy
Plant-wide Ethernet/Serial
ControlNet
SIL2-certified ControlLogix components’ portion of the overall safety loop
Programming Software
For SIL applications, a programming
terminal is not normally connected.
HMI
For Diagnostics and Visualization (read-only access to controllers in the
safety loop). For more information, see publication 1756-RM001.
E
N
B
C
N
B
To other safety related
ControlLogix or FLEX I/O
remote I/O chassis
Overall Safety Loop
Actuator
Actuator
1794 FLEX I/O
Input
Device
DI1
DO2
DO1
DI2
ControlNet
Input
Device
To other safety related
ControlLogix or FLEX I/O
remote I/O chassis
See Figures 3.1 and 3.5 for details.
1
Note 1: Multiple 1756-CNB or -CNBR modules can be installed into the chassis as needed.
Other configurations are possible as long as they are SIL2 approved.
+V
SIL2 Certification
Figure 1.1 shows a typical SIL loop, including:
• the overall safety loop
• the ControlLogix/FLEX I/O portion of the overall safety loop
• how other devices (for example, HMI) connect to the loop, while
operating outside the loop
Figure 1.1
Note 2: Two adapters are required for meeting SIL2 as shown in the figure.
The adapters can be either ControlNet or Ethernet and must be from the list of approved products.
Publication 1794-RM001G-EN-P - December 2011
SIL Policy 1-3
IMPORTANT
IMPORTANT
Important Note related to published PFDs.
• The user must choose the appropriate PFD depending
on combinations and the appropriate 1oo1 or 1oo2
configuration.
• Descrete and analog inputs must be used in a 1oo2
configuration for SIL 2.
• Adapters must be used in a 1oo2.
• Outputs may be 1oo2 in series or 1oo1 monitored by
an input with an external relay as a secondary device to
remove power.
• Some specialized inputs can only be wired to a single
sensor such as thermocuples and two 1oo1 PFDs must
be used for each.
• The total PFD for two 1oo1s is the sum of both.
The system user is responsible for:
Proof Tests
• the set-up, SIL rating and validation of any sensors or
actuators connected to the ControlLogix/FLEX I/O
control system.
• project management and functional testing.
programming the application software and the module
configuration according to the description in the
following chapters.
The SIL2 portion of the certified system excludes the
development tools and display/human machine interface
(HMI) devices; these tools and devices are not part of the
run time control loop.
IEC 61508 requires the user to perform various proof tests of the equipment
used in the system. Proof tests are performed at user-defined times (for
example, proof test intervals can be once a year, once every two years or
whatever timeframe is appropriate) and include some of the following tests:
• Testing of all fault routines to verify that process parameters are
monitored properly and the system reacts properly when a fault
condition arises.
• Testing of digital input or output channels to verify that they are not
stuck in the ON or OFF state.
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1-4 SIL Policy
IMPORTANT
• Calibration of analog input and output modules to verify that accurate
data is obtained from and used on the modules.
Users’ specific applications will determine the timeframe
for the proof test interval.
However, keep in mind that the Probability of Failure on
Demand (PFD) calculations listed in Table 1.2 on page 1-8
use a proof test interval of once per year. If the proof test
interval is changed, the information must be recalculated.
For more information on system proof tests, see Publication 1756-RM001
more information on the necessary I/O module, see Table 1.1.
. For
Publication 1794-RM001G-EN-P - December 2011
SIL Policy 1-5
SIL2-Certified FLEX I/O
Table 1.1 lists the components available for use in a SIL2-certified FLEX I/O
system. For a list of ControlLogix SIL2 certified products, see publication
System Components
Table 1.1 FLEX I/O Components For Use in the SIL 2 System
1794-IP44 Ch. Pulse Counter ModuleB4, 4.x1794-IN0641794-UM016
1794-IE4XOE2XT4 Input/2 Output Analog
BNA1794-IN125NA
Combo Module
1794-IE8XT8 Input analog ModuleBNA
1794-OE4XT4 Output Analog ModuleBNA
1794-IF2XOF2IXT2 Input/2 Output Isolated
AI, I.x1794-IN129
Analog Combo Module
1794-IF4IXT4 Isolated Input Analog
AI, I.x
Module
1794-OF4IXT4 Isolated Output Analog
AI, I.x
Module
1794-IF4ICFXT4 Isolated Input Analog
AI, I.x1794-IN130
Module
1794-IJ2XT2 Ch. Frequency Counter
AE, E.x1794-IN049
Module
1794-IRT8XT8 TC/RTD Input Analog
BD, E, E.1, E.x 1794-IN050
Module
Publication 1794-RM001G-EN-P - December 2011
Table 1.1 FLEX I/O Components For Use in the SIL 2 System
SIL Policy 1-7
Related Documentation
with More Information on
Catalog Number:
Device Type:Catalog Number:
Terminal Base
Units
1794-TB33-Wire Terminal Base UnitANA1794-IN092NA
1794-TB3S3-Wire Terminal Base UnitANA
1794-TB3TTemperature Terminal Base
Firmware
Revision:
(1)
Description:
Series
(2)
(2) (3)
ANA
Installation
Instructions:
User Manual:
Unit
1794-TB3TSSpring-clamp Temperature
ANA
Base Unit
1794-TB3GCage-clamp Gen. Terminal
ANA
Base Unit
1794-TB3GSSpring-clamp Gen. Terminal
ANA
Base Unit
1794-TBNNEMA Terminal Base UnitANA
1794-TBNFFused NEMA Terminal Base
ANA
Unit
(1)
Certain catalog numbers have a K suffix. This indicates a conformally coated version of the product. These K versions have the same SIL2 certification as the non-K
versions.
(2)
The FW versions marked with extension .x (x can be 0 ... 99) are constitute to minor changes for enhancements. The test institute will be informed on any change.
(3)
Users must use these series and firmware revisions for their application to be SIL2 certified. Firmware revisions are available by visiting
These publications are available from Rockwell Automation by visiting http://literature.rockwellautomation.com.
(4)
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1-8 SIL Policy
Hardware Designs and
Firmware Functions
Difference Between PFD
and PFH
Diagnostic hardware designs and firmware functions designed into the
ControlLogix/FLEX I/O platform allow it to achieve at least SIL2
certification in a single-controller configuration. These diagnostic features are
incorporated into specific FLEX I/O components, such as the:
• adapter
• power supply
• I/O modules
• terminal base units
and are covered in subsequent sections. The ControlLogix/FLEX I/O
platform’s designs, features and characteristics make it one of the most
intelligent platforms.
Table 1.2 and Table 1.3 present values of the PFDs and PFHs for the specific
FLEX I/O products evaluated by TUV.
FLEX I/O uses the same PFD and PFH assumptions as stated in publication
1756-RM001
.
Table 1.2 FLEX I/O Product Probability of Failure on Demand (PFD) Calculations (T1 = 1 yr)
Catalog NumberDescriptionMean Time
Between Failure
(1)
(MTBF)
1794-ACN15ControlNet Single Media Adapter8,223,6841.22E-072.15E-06
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-072.15E-06
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-062.76E-05
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-071.45E-05
1794-IB10XOB610 Input/6 Output Module4,943,4422.02E-073.60E-06
1794-IB1616 Sink Input Module4,105,0902.44E-074.34E-06
1794-IE8Analog Input Module37,952,6792.63E-084.64E-07
1794-IF2XOF2IIsolated Analog Input/Output Module25,296,9603.95E-086.97E-07
1794-IF4IIsolated Analog Input Module11,746,3438.51E-081.50E-06
1794-IJ2Frequency Counter Module2,418,3214.14E-077.45E-06
1794-IP4Pulse Counter Module2,375,3604.21E-077.58E-06
1794-IR8RTD Input Module6,191,6551.62E-072.87E-06
1794-IRT8TC/RTD/mV Input Module1,182,4388.46E-071.56E-05
1794-IT8Thermocouple Input Module1,564,3246.39E-071.17E-05
1794-OB1616 Source Output Module1,883,5945.31E-079.62E-06
1794-OB16PProtected Output Module2,135,2804.68E-078.46E-06
(3)
λ
Calculated PFD
1oo2 architecture
Publication 1794-RM001G-EN-P - December 2011
Table 1.2 FLEX I/O Product Probability of Failure on Demand (PFD) Calculations (T1 = 1 yr)
SIL Policy 1-9
Catalog NumberDescriptionMean Time
Between Failure
(1)
(MTBF)
1794-OB8EPProtected Output Module
2,389,669
(2)
(3)
λ
4.18E-077.54E-06
Calculated PFD
1oo2 architecture
1794-OE4Analog Output Module23,807,0864.20E-087.41E-07
1794-OF4IIsolated Analog Output Module7,191,1281.39E-072.47E-06
1794-OW8Relay Output Module14,766,8766.77E-081.20E-06
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-088.35E-07
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-086.45E-07
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-083.79E-07
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
(2)
(2)
1.40E-082.46E-07
1.37E-082.41E-07
1.32E-082.32E-07
1794-TBNTerminal Base Units75,716,6151.32E-082.32E-07
1794-TBNFFused Terminal Base Units
4,812,320
(2)
2.08E-073.70E-06
1794-ACNR15XTControlNet Redundant Media Adapter8,223,6841.22E-072.15E-06
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-071.45E-05
1794-OB8EPXT8 Protected Output Module14,771,0496.77E-081.20E-06
1794-IB16XT16 Sink Input Module35,587,1892.81E-084.95E-07
1794-OB16PXT16 Protected Output Module26,709,4013.74E-086.60E-07
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-087.94E-07
1794-OW8XT8 Relay Output Module18,518,5195.40E-089.53E-07
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-081.50E-06
1794-IE8XT8 Input analog Module14,041,0007.12E-081.26E-06
1794-OE4XT4 Output Analog Module11,381,7448.79E-081.55E-06
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-072.81E-06
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-072.43E-06
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-072.43E-06
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-073.24E-06
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-081.51E-06
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-072.16E-06
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1/MTBF
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Table 1.3 FLEX I/O Product Probability of Undetected Dangerous Failure per Hour (PFH) Calculations (T1 = 1 yr)
Catalog NumberDescriptionMean Time
Between Failure
(1)
(MTBF)
(3)
λ
Calculated PFH
1oo2 architecture
1794-ACN15ControlNet Single Media Adapter8,223,6841.22E-078.64E-10
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-078.64E-10
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-061.19E-08
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter
1794-OE4Analog Output Module23,807,0864.20E-082.96E-10
1794-OF4IIsolated Analog Output Module7,191,1281.39E-079.90E-10
1794-OW8Relay Output Module14,766,8766.77E-084.78E-10
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-083.33E-10
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-082.57E-10
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-081.51E-10
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
(2)
(2)
1.40E-089.82E-11
1.37E-089.59E11
1.32E-089.25E-11
1794-TBNTerminal Base Units75,716,6151.32E-089.26E-11
1794-TBNFFused Terminal Base Units
4,812,320
(2)
2.08E-071.49E-09
1794-ACNR15XTControlNet Redundant Media Adapte8,223,6841.22E-078.64E-10
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter
Table 1.3 FLEX I/O Product Probability of Undetected Dangerous Failure per Hour (PFH) Calculations (T1 = 1 yr)
SIL Policy 1-11
Catalog NumberDescriptionMean Time
Between Failure
(1)
(MTBF)
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-085.99E-10
1794-IE8XT8 Input analog Module14,041,0007.12E-085.03E-10
1794-OE4XT4 Output Analog Module11,381,7448.79E-086.22E-10
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-071.13E-09
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-079.75E-10
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-079.75E-10
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-071.30E-09
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-086.04E-10
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-078.66E-10
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1/MTBF
(3)
λ
Calculated PFH
1oo2 architecture
Table 1.4 shows an example of a PFD calculation for a safety loop involving
two DC input modules used in a 1oo2 configuration and a DC output module.
Table 1.4
Catalog Number:Description:MTBF:Calculated
1oo2 PFD:
1794-ACNR15ControlNet Dual Media
Adapter 1.5
1794-IB1624V DC Input Module6,409,8464.34E-06
1794-IB1624V DC Input Module6,409,8464.34E-06
1794-OB1624V DC Output Module4,284,8579.62E-06
1794-OW8Relay Output Module1,312,9731.20E-06
1756-L63B
1756-CNBControlNet Bridge Module3,596,0871.15E-04
1756-CNBControlNet Bridge Module3,596,0871.15E-04
Total PFD calculation for a safety loop consisting of these products:3.70E-04
1 See Publication 1756-RM001
1
ControlLogix Controller2,460,0652.33E-04
for more information.
3,259,6051.56E-06
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1-12 SIL Policy
B
B
1794-OB16
1794-IB16
1794-TB3 (1)
1794-TB3 (2)
1794-ACNR15 (1)
1794-ACNR15 (2)
1794-IB16
1794-OW8
1756-CNB
1756-L63B
ControlNet
ControlNet
1756-CNB
Publication 1794-RM001G-EN-P - December 2011
SIL Policy 1-13
SIL Compliance
Distribution and Weight
Response Times
The programmable controller may conservatively be assumed to contribute
10% of the reliability burden. A SIL 2 system may need to incorporate multiple
inputs for critical sensors and input devices, as well as dual outputs connected
in series to dual actuators dependent on SIL assessments for the safety related
system.
The response time of the system is defined as the amount of time it takes for a
change in an input condition to be recognized and processed by the
controller’s ladder logic program, and then to initiate the appropriate output
signal to an actuator. The system response time is the sum of the following:
• input hardware delays
• input filtering
• I/O and communication module RPI settings
• controller program scan times
• output module propagation delays
See Table 1.1 for associated module information.
Each of the times listed above is variably dependent on factors such as the type
of I/O module and instructions used in the ladder program. For examples of
how to perform these calculations, see publication 1756-RM001
.
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1-14 SIL Policy
Notes:
Publication 1794-RM001G-EN-P - December 2011
Chapter
2
ControlLogix Communications
This chapter discusses the communication modules used in a ControlLogix
SIL2 system.
The ControlNet bridge modules (1756-CNB & 1756-CNBR) provide for the
communications between ControlLogix and FLEX I/O system.
2-3
ControlNet Cabling
For remote racks, 802.3 compliant shielded or unshielded twisted pair cable is
required for EtherNet/IP. Although it is not a requirement to use redundant
media with the 1756-CNBR, it does provide higher system availability.
Redundant media is not required for SIL2 operation.
ControlNet Module Diagnostic Coverage
All communications over the passive ControlNet media occur via CIP, which
guarantees delivery of the data. All modules independently verify proper
transmission of the data.
EtherNet/IP Bridge Module
The EtherNet/IP bridge modules (1756-ENBT, 1756-EN2T, 1756-EN2TR,
and 1756-EN2TXT) provide for the communications between ControlLogix
and FLEX I/O system.
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2-2 ControlLogix Communications
EtherNet/IP Cabling
802.3 compliant shielded or unshielded twisted pair cable is required for
EtherNet/IP.
EtherNet/IP Module Diagnostic Coverage
Communications over 10/100 MbpsNet media occur via CIP, which
guarantees delivery of the data. All modules independently verify proper
transmission of the data.
Module Fault Reporting for
any FLEX I/O Module
To monitor the connection status for this type of connection, use a Get
System Value (GSV) and an examination of MODULE objects’ "Entry Status"
attribute for a running connection.
An example of how this might be done is shown in Figure 2.1. This method,
or something similiar, must be used to interrogate the health of each I/O
module in the system.
Figure 2.1 Example of Checking a Module’s Health in Ladder Logic
GSV
Obtain MODULE
Object’s Entry Status
NEQ
Check Entry Status to
make sure module is
running
AND
Mask Off Lower 12
Bits of Value
Fault
For more information on the GSV instruction, monitor the SlotStatusBits for
the Input tag of the associated adapter. The lower 8 bits of this tag correspond
to the associated slot. For example, the tag "Node3:I.SlotlStatusBits" is defined
as follows:
Publication 1794-RM001G-EN-P - December 2011
NODE3 - This is the name given to the associated 1794-AVNR15.
I = This indicates the Input file.
ControlLogix Communications 2-3
Module
0
Module
1
Module
2
Module
3
Module
4
Module
5
Module
6
Module
7
SlotStatusBits - This is a 32 bit value. The lower 8 bits of this value are defined
as follows for FLEX I/O:
Related Communications
Modules Documentation
For more information on ControlLogix communications modules, see the
following Rockwell Automation publications listed in Table 2.1:
Table 2.1
Catalog
Number:Description:
1756-CNBControlNet Communication
Module
1756-CNBRRedundant ControlNet
Communication Module
Installation
Instructions:
1756-IN571
User Manual:
CNET-UM001
These publications are available from Rockwell Automation at:
http://literature.rockwellautomation.com
.
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2-4 ControlLogix Communications
Publication 1794-RM001G-EN-P - December 2011
Chapter
FLEX I/O Modules
This chapter discusses the FLEX I/O modules that are SIL2 certified.
For information about:See page:
Overview of FLEX I/O Modules3-1
Using Digital Input Modules3-2
Wiring FLEX I/O Digital Input Modules3-3
General Considerations when using Any FLEX
I/O Digital Output Module
Wiring FLEX I/O Digital Output Modules3-5
Using Analog Input Modules3-7
3-4
3
Overview of FLEX I/O
Modules
Wiring FLEX I/O Analog Input Modules3-9
Checklist for SIL Inputs3-18
Checklist for SIL Outputs3-19
In the most basic description, there are two types of SIL2-certified FLEX I/O
modules:
• Digital I/O modules
• Analog I/O modules
With each type, however, there are differences between specific modules.
Because the differences propagate to varying levels in each module type, a
graphical representation can best provide an overview of the many
SIL2-certified FLEX I/O modules.
FLEX I/O modules are designed with inherent features that assist them in
complying with the requirements of the 61508 Standard. For example, the
modules all have a common backplane interface, execute power-up and
runtime diagnostics, and offer electronic keying.
Table 1.1 lists the FLEX I/O modules initially submitted for SIL2
certification.
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1Publication 1794-RM001G-EN-P - December 2011
3-2 FLEX I/O Modules
Using Digital
Input Modules
General Considerations when using Any FLEX I/O Digital Input
Module
Regardless of the type of FLEX I/O input module used, there are a number of
general application considerations that users must follow when applying these
modules in a SIL2 application:
• Proof Tests - Periodically (for example, once every several years) a
System Validation test must be performed. Manually, or automatically,
test inputs to make sure that all inputs are operational and not stuck in
the ON or OFF state. Inputs must be cycled from ON to OFF or OFF
to ON. .
• Wire sensors to separate input points on two separate modules that are
on different ControlNet nodes.
• Configuration parameters (for example, RPI, filter values) must be
identical between the two modules.
• The same controller must own both modules.
• Monitor the ControlNet status bits for the associated module and
ensure that appropriate action is invoked via the application logic by
these status bits.
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-3
Input 1Input 2
Input
COM
+24V
12 3 45 67 891011121314150
24VDC SINK INPUT
1794-IB16
12 3 45 67 891011121314150
24VDC SINK INPUT
1794-IB16
12 3 45 67 891011121314150
24VDC SINK INPUT
1794-IB16
12 3 45 67 891011121314150
24VDC SINK INPUT
1794-IB16
Input
COM
+24V
Input 1Input 2
SIL2 SENSOR
SENSOR
SENSOR
+24V dc
Optional relay contact
to switch line voltage
for periodic automated
testing
43366
One-Sensor Wiring Example
Two-Sensor Wiring Example
43366
Note 1: Both sensors are monitoring the same safety application.
1
1
Input BInput A
Actuator
Input BInput A
Input BInput A
Tim er
Timer preset in milliseconds to
compensate for filter time and
hardware delay differences.
Fault
Timer Done
Alarm to Operator
Fault
Wiring FLEX I/O Digital
Input Modules
The wiring diagrams in Figure 3.1 show two methods of wiring the digital
input Module. In either case, users must determine whether the use of 1 or 2 sensors is appropriate to fulfill SIL2 requirements.
Figure 3.1 ControlLogix Digital Input Module Wiring
Application logic can compare input values or states for concurrence.
Figure 3.2
The user program must also contain rungs to annunciate a fault in the event of
a sustained miscompare between two points.
Figure 3.3
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3-4 FLEX I/O Modules
The control, diagnostics and alarming functions must be performed in
sequence. For more information on faults, see publication 1756-RM001
.
General Considerations when using Any FLEX I/O Digital Output
Module
Regardless of the type of FLEX I/O output module used, there are a number
of general application considerations that you must follow when applying
these modules in a SIL2 application:
• Proof Tests - Periodically (for example, once every several years) a
System Validation test must be performed. Manually, or automatically,
test outputs to make sure that all outputs are operational and not stuck
in the ON or OFF state. Outputs must be cycled from ON to OFF or
OFF to ON. For additional information, refer to publication
1756-RM001
.
Figure 3.4
Application Logic
Output Bit
Output Bit
Timer done
Fault
Monitoring Input
Monitoring Input
Output Fault
Actuator
Tim er
Fault
Alarm to Operator
The control, diagnostics and alarming functions must be performed in
sequence..
• Use of external Relays to disconnect Module Power if Output
De-energization is Critical: To make sure outputs will de-energize,
users must wire an external method that can remove power from the
actuator if a short or other fault is detected.
Publication 1794-RM001G-EN-P - December 2011
• Test outputs at specific times to make sure they are operating
properly. The method and frequency of testing is determined by the
type of module.
FLEX I/O Modules 3-5
12 345 67 891011121314150
24VDC SOURCE OUTPUT
1794-OB16
1 2 3 4 5 6 7 8 91011121314150
24VDC SINK INPUT
1794-IB16
Standard Digital
Output Module
43363
Standard Digital
Input Module
+24V
COM
Output
Actuator
Install a relay in position A or B. This relay is controlled by another
output in the ControlLogix/FLEX I/O system. If a short circuit or fault
occurs on output modules, the relay can disconnect power to the
modules. An isolated relay output module (1794-OW8) can be used for
this purpose when it is connected to a different 1794-ACN15 or
-ACNR15 ControlNet Adapter module.
Wire output point
to input point to
verify the correct
state of the output
COM
24V dc
A
B
Note: Other configurations are possible as long they are
SIL2 approved.
• Monitor the ControlNet status bits for the associated module and
ensure that appropriate action is invoked via the application logic by
these status bits.
Wiring FLEX I/O Digital
Output Modules
Standard Digital Output Modules
When using standard output modules, users must wire an output to an
actuator and then back to an input to monitor the output’s performance.
In addition to following the General Considerations when using Any FLEX
I/O Digital Output Module on page 3-4, the user must wire each standard
output to a corresponding input to validate that the output is following its
commanded state.
Figure 3.5 ControlLogix/FLEX I/O Standard Output Module Wiring
Application logic must be written to generate a fault in the event of a
miscompare between the requested state of an output (echo) and the actual
output state monitored by an input channel (see Figure 3.4).
The control, diagnostics and alarming functions must be performed in
sequence.
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3-6 FLEX I/O Modules
1 2 3 4 5 67 8910 11121314150
24VDC SINK INPUT
1794-IB16
1 2 3 4 5 67 8910 11121314150
24VDC SOURCE OUTPUT
1794-OB16
1 2 3 4 5 67 8910 11121314150
24VDC SOURCE OUTPUT
1794-OB16
Isolated Relay
Output Module
43364
Standard Digital
Input Module
Standard Digital
Output Module
+24V
COM
Wire output point
to input point to
verify the correct
state of the output
Output
Output
Actuator
+24V
COM
Note 1: An external relay can be replaced with an isolated
relay module which is mounted in another FLEX I/O rail.
Users can also wire a standard digital output module in series with an isolated
relay output module in series with a critical actuator. In the event that a failure
is detected, the output from both output modules must be set to OFF to
guarantee the Output Loads de-energize. This is shown in Figure 3.6.
Figure 3.6 ControlLogix/FLEX I/O Standard Output Module Wiring With an Isolated
Relay Module
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-7
Using Analog Input
Modules
General Considerations when using Any FLEX I/O Analog Input
Module
There are a number of general application considerations that you must follow
when applying these modules in a SIL2 application:
• Proof Tests - Periodically (for example, once every several years) a
System Validation test must be performed. Manually, or automatically,
test inputs to make sure that all inputs are operational. Field signal levels
should be varied over the full operating range to make sure that the
corresponding channel data varies accordingly. For additional
information, refer to publication 1756-RM001
• Calibrate Inputs Periodically, As Necessary: FLEX I/O modules
ship from the factory with a highly accurate level of calibration.
However, because each application is different, users are responsible for
making sure their FLEX I/O modules are properly calibrated for their
specific application.
Users can employ tests in application program logic to determine when
a module requires recalibration. For example, to determine whether an
input module needs to be recalibrated, a user can determine a tolerance
band of accuracy for a specific application. The user can then measure
input values on multiple channels and compare those values to
acceptable values within the tolerance band. Based on the differences in
the comparison, the user could then determine whether recalibration is
necessary.
.
Calibration (and subsequent recalibration) is not a safety issue.
However, we recommend that each analog input be calibrated at least
every 3 years to verify the accuracy of the input signal and avoid
nuisance application shutdowns.
• Compare Analog Input Data and Annunciate Miscompares: When
wiring sensors to two inputs channels, the values from those channels
must be compared to each other for concurrence within an acceptable
range for the application before actuating an output. Any miscompare
between the two inputs outside the programmed acceptable range must
be annunciated as a fault.
In Figure 3.7, a user-defined percentage of acceptable deviation (that is,
tolerance) is applied to the configured input range of the analog inputs
(that is, range) and the result is stored (that is, delta). This delta value is
then added to and subtracted from one of the input channels; the results
define an acceptable High and Low limit of deviation. The second input
channel is then compared to these limits to determine if the input are
working properly.
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3-8 FLEX I/O Modules
Timer done
Tim er
Inputs Faulted
Alarm to Operator
Inputs OK
SUB
Delta
Input 1
Low Limit
ADD
Delta
Input 1
High Limit
MULT
Range
Tole rance %
Delta
Inputs Faulted
LIM
Low Limit
Input 2
High Limit
Inputs OK
The input’s OK bit preconditions a Timer run that is preset to
accommodate an acceptable fault response time and any communication
filtering lags in the system. If the inputs miscompare for longer than the
preset value, a fault is registered with a corresponding alarm.
Figure 3.7
The control, diagnostics and alarming functions must be performed in
sequence.
• Configuration parameters (for example, RPI, filter values) must be
identical between the two modules.
• The same controller must own both modules.
• Monitor the ControlNet status bits for the associated module and
ensure that appropriate action is invoked via the application logic by
these status bits.
• Wire sensors to separate input channels on two separate modules that
are on different ControlNet nodes.
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-9
Input 1Input 2
Input
COM
+24V
Input
COM
+24V
Input 1Input 2
SIL2 SENSOR
SENSOR
43366A
One-Sensor Wiring Example
Two-Sensor Wiring Example
SENSOR
Note 1: Both sensors are monitoring the same safety application.
1
1
Voltage
Transmitter A
1794-TB3
1794-TB3
1794-TB3
1794-TB3
Analog Input
1794-IE8
Analog Input
1794-IE8
Analog Input
1794-IF4I
Analog Input
1794-IF4I
Voltage
Transmitter A
Voltage
Transmitter B
Voltage
Transmitter B
+
-
+
-
+
-
+
-
Wiring FLEX I/O Analog
Input Modules
The wiring diagrams in show two methods of wiring the analog input
Module. In either case, users must determine whether the use of 1 or 2 sensors is appropriate to fulfill SIL2 requirements.
Figure 3.8 ControlLogix Analog Input Module Wiring
Wiring the Single-Ended Input Module in Voltage Mode
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, make sure you use the correct
documentation (listed in Table 1.1 on page 1-5) to wire the module.
Figure 3.9 FLEX I/O Analog Input Module Wiring in Voltage Mode
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3-10 FLEX I/O Modules
RET
RET
RET
RET
Current
Source B
Current
Source B
Current
Source A
Current
Source A
1794-TB3
1794-TB3
1794-TB3
1794-TB3
1794-IE8
Analog Input
1794-IE8
Analog Input
1794-IE8
Analog Input
1794-IF4I
Analog Input
1794-IF4I
Wiring the Single-Ended Input Module in Current Mode
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, before wiring the module, consider
the following application guideline:
• Placement of Other Devices in Current Loop: you can locate other
devices in an input channel’s current loop anywhere as long as the
current source can provide sufficient voltage to accommodate all of the
voltage drops (each module input is 250 ohms)
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-11
+
-
+
-
+
-
+
-
Thermocouple
Input Module
Thermocouple
Input Module
Thermocouple/
RTD/mV
Input Module
Thermocouple/
RTD/mV
Input Module
1794-TB3T
1794-TB3T
1794-TB3G
1794-TB3G
1794-IT8
1794-IT8
1794-IRT8
1794-IRT8
Wiring the Thermocouple Input Module
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, before wiring the module, consider
the following application guideline:
• Wire to Same Input Channel on Both Modules: When wiring
thermocouples, wire two in parallel to two modules. Use the same
channel on each module to make sure of consistent temperature
readings.
Figure 3.10 FLEX I/O Analog Thermocouple Module Wiring
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3-12 FLEX I/O Modules
RTD
Input Module
RTD
Input Module
Thermocouple/
RTD/mV
Input Module
Thermocouple/
RTD/mV
Input Module
1794-TB3T
1794-TB3T
1794-TB3G
1794-TB3G
1794-IR8
1794-IR8
1794-IRT8
1794-IRT8
4-Wire RTD
3-Wire RTD
Note: 2, 3, or 4-wire RTDs can be used as applicable to the associated RTD input module.
Wiring the RTD Input Module
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, before wiring the module, consider
the following application guideline:
• RTDs cannot be wired in parallel without severely affecting their
accuracy. Two sensors must be used.
Figure 3.11 FLEX I/O Analog RTD Module Wiring
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-13
Using Analog Output
Modules
General Considerations when using Any FLEX I/O Analog Output
Module
There are a number of general application considerations that you must follow
when applying the analog output modules in a SIL2 application:
• Proof Tests - Periodically (for example, once every several years) a
System Validation test must be performed. Manually, or automatically,
test outputs to make sure that all outputs are operational. Channel data
should be varied over the full operating range to make sure that the
corresponding field signal levels vary accordingly. For additional
information on , see Publication 1756-RM001
• Calibrate Outputs Periodically, As Necessary: FLEX I/O modules
ship from the factory with a highly accurate level of calibration.
However, because each application is different, users are responsible for
making sure their FLEX I/O modules are properly calibrated for their
specific application.
Users can employ tests in application program logic to determine when
a module requires recalibration. For example, to determine whether an
output module needs to be recalibrated, a user can determine a tolerance
band of accuracy for a specific application. The user can then measure
output values on multiple channels and compare those values to
acceptable values within the tolerance band. Based on the differences in
the comparison, the user could then determine whether recalibration is
necessary.
.
Calibration (and subsequent recalibration) is not a safety issue.
However, we recommend that each analog output be calibrated at least
every 3 years to verify the accuracy of the input signal and avoid
nuisance application shutdowns.
• For typical emergency shutdown (ESD) applications outputs must
be configured to De-energize: When configuring any FLEX I/O
output module, each output must be configured to de-energize in the
event of a fault and in the event of the controller going into program
mode. For exceptions to the typical ESD applications, see publication
1756-RM001
.
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3-14 FLEX I/O Modules
Timer done
Tim er
Outputs Faulted
Alarm to Operator
Outputs OK
ADD
Delta
Monitoring input
High Limit
MULT
Range
Tole rance %
Delta
Outputs Faulted
LIM
Low Limit
Output Echo
High Limit
Outputs OK
SUB
Delta
Monitoring input
Low Limit
• Wire Output Back to Input and Examination of Output Data
Feedback signal: Users must wire an analog output to an actuator and
then back to an analog input to monitor the output’s performance. (The
use of feedback transmitters to verify an output’s performance is
acceptable.) The application logic must examine the Data Feedback
value associated with each output point to make sure that the requested
output command from the controller was received by the module. The
value must be compared to the analog input that is monitoring the
output to make sure the value is in an acceptable range for the
application.
In the ladder diagram in Figure 3.12, a user-defined percentage of
acceptable deviation (that is, tolerance) is applied to the configured
range of the analog input and output (that is, range) and the result is
stored (that is, delta). This delta value is then added to and subtracted
from the monitoring analog input channel; the results define an
acceptable High and Low limit of deviation. The analog Output
Feedback is then compared to these limits to determine if the output are
working properly.
The output’s OK bit preconditions a Timer run that is preset to
accommodate an acceptable fault response time and any communication
filtering, or output, lags in the system. If the monitoring input value and
the Output Feedback miscompare for longer than the preset value, a
fault is registered with a corresponding alarm.
Figure 3.12 Monitoring an Analog Output with an Analog Input
Publication 1794-RM001G-EN-P - December 2011
The control, diagnostics and alarming functions must be performed in
sequence.
FLEX I/O Modules 3-15
• When wiring two analog output modules in the same application, make
sure:
– Both modules use identical configuration.
– The same controller owns both modules.
• Monitor the ControlNet status bits for the associated module and
ensure that appropriate action is invoked via the application logic by
these status bits.
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3-16 FLEX I/O Modules
+
_
VRET
+
_
VRET
1794-TB3
1794-IF4I
Analog Output
Module
1794-TB3
1794-IE8
Analog Input
Module
Isolated Analog
Output Module
Isolated Analog
Input Module
1794-OF4I
1794-TB3
1794-TB3
Actuator
Actuator
1794-OE4
Wiring FLEX I/O Analog
Output Modules
In general, good design practice dictates that each analog output must be wired
to a separate input terminal to make sure that the output is functioning
properly.
Wiring the Analog Output Module in Voltage Mode
Users must wire analog outputs to an actuator and then back to an analog
input to monitor the output performance.
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-17
1794-TB3
1794-IF4I
Analog Output
Module
1794-TB3
1794-IE8
Analog Input
Module
Isolated Analog
Output Module
Isolated Analog
Input Module
1794-OF4I
1794-TB3
1794-TB3
Actuator
Actuator
1794-OE4
Wiring the Analog Output Module in Current Mode
In addition to following the General Considerations when using Any FLEX
I/O Analog Output Module on page 3-13, consider the following application
guideline before wiring the module in current mode:
• Placement of Other Devices in Current Loop: you can locate other
devices in an output channel’s current loop anywhere as long as the
current source can provide sufficient voltage to accommodate all of the
voltage drops.
+
+
_
_
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3-18 FLEX I/O Modules
Checklist for SIL Inputs
The following checklist is required for planning, programming and start up of
SIL inputs. It may be used as a planning guide as well as during proof testing. If
used as a planning guide, the checklist can be saved as a record of the plan.
For programming or start-up, an individual checklist can be filled in for every
single SIL input channel in a system. This is the only way to make sure that the
requirements were fully and clearly implemented. This checklist can also be
used as documentation on the connection of external wiring to the application
program.
Input Check List for ControlLogix/FLEX I/O System
Company:
Site:
Loop definition:
SIL input channels in the:
No.All Input Module Requirements (apply to both digital and analog input modules)YesNoComment
1Is the RPI value set to an appropriate value for your application?
2Are all modules owned by the same controller?
3Have you performed proof tests on the system and modules?
4Have you set up the fault routines?
5Are control, diagnostics and alarming functions performed in sequence in application logic?
Note: The user must ensure that the hardware series and the firmware series and revision of the FLEX I/O
modules in their system are SIL2 certified.
6Is the application logic monitoring one ControlNet status bit for the associated module and is appropriate
action invoked via the application logic by these bits?
No.Additional Digital Input Module-Only RequirementsYesNoComment
1When two digital input modules are wired in the same application, do the following conditions exist:
• Both modules are owned by the same controller.
• Sensors are wired to separate input points.
• The operational state is ON.
• The non-operational state is. OFF.
• Configuration parameters (for example, RPI, filter values) are identical.
• Both input modules are on different ControlNet nodes.
2For the standard input modules, is the Communication Format set to one of the Input Data choices?
No.Additional Analog Input Module-Only RequirementsYesNoComment
1Have you calibrated the modules as often as required by your application?
2Are you using ladder logic to compare the analog input data on two channels to make sure there is
concurrence within an acceptable range and that redundant data is used properly?
3Have you written application logic to examine bits for any condition that may cause a fault and appropriate
fault routines to handle the fault condition?
4When wiring the FLEX I/O analog module in voltage mode, are transmitter connections wired correctly?
5When wiring the FLEX I/O analog module in current mode, are loop devices placed properly?
6When wiring FLEX I/O thermocouple modules in parallel, have you wired to the same channel on each
module?
7When wiring two FLEX I/O RTD modules, are two sensors used?
8When two analog inputs are wired in the same application, are both modules on different ControlNet Nodes?
Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-19
Checklist for SIL Outputs
The following checklist is required for planning, programming and start up of
SIL outputs. It may be used as a planning guide as well as during proof testing.
If used as a planning guide, the checklist can be saved as a record of the plan.
For programming or start-up, an individual requirement checklist must be
filled in for every single SIL output channel in a system. This is the only way to
make sure that the requirements are fully and clearly implemented. This
checklist can also be used as documentation on the connection of external
wiring to the application program.
Output Check List for ControlLogix/FLEX I/O System
Company:
Site:
Loop definition:
SIL output channels in the:
No.All Output Module Requirements (apply to both digital and analog output modules)YesNoComment:
1Have you performed proof tests on the modules?
2Is the RPI value set to an appropriate value for your application?
3Have you set up fault routines, including comparing output data with a corresponding input point?
4If required, have you used external relays in your application to disconnect module power if a short or
other fault is detected on the module or isolated output in series?
5Is the control of the external relay implemented in ladder logic?
6Have you examined the Output Data feedback signal in application logic?
7Are all outputs configured to deenergize in the event of a fault or the controller entering program
mode?
8Do two modules of the same type, used in the same application, use identical configurations?
9Does one controller own both modules if two of the same type are used in an application?
10Are control, diagnostics and alarming functions performed in sequence in application logic?
11Is the application logic monitoring one ControlNet status bit for the associated module and is
appropriate action invoked via the application logic by these bits?
1For the standard output modules, is the Communication Format set to Output Data?
2For standard output modules, have you wired the outputs to a corresponding input to validate that the
1Have you calibrated the modules as often as required by your application?
2When wiring the FLEX I/O analog output module in current mode, are loop devices placed properly?
3Have you written application logic to examine bits for any condition that may cause a fault and
appropriate fault routines to handle the fault condition?
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Notes:
Publication 1794-RM001G-EN-P - December 2011
Chapter
General Requirements for
Application Software
Refer to publication 1756-RM001, Using ControlLogix in SIL2 Applications.
4
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4-2 General Requirements for Application Software
Notes:
Publication 1794-RM001G-EN-P - December 2011
Chapter
Technical SIL2 Requirements for the
Application Program
Refer to publication 1756-RM001 for Technical SIL2 Requirements for the
application program.
5
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5-2 Technical SIL2 Requirements for the Application Program
Notes:
Publication 1794-RM001G-EN-P - December 2011
Failure Estimates
The following tables list the failure estimates for the FLEX I/O products
included in this manual for different proof test intervals.
Table A.1 MTBF Field Data and Per Module PFD Estimates - T1 = 1 year
Appendix
A
Catalog Number:Description:
1794-ACN15ControlNet Single Media Adapter8,223,6841.22E-072.15E-06
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-072.15E-06
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-062.76E-05
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-071.45E-05
1794-IB10XOB610 Input/6 Output Module4,943,4422.02E-073.60E-06
1794-IB1616 Sink Input Module4,105,0902.44E-074.34E-06
1794-IE8Analog Input Module37,952,6792.63E-084.64E-07
1794-IF2XOF2IIsolated Analog Input/Output Module25,296,9603.95E-086.97E-07
1794-IF4IIsolated Analog Input Module11,746,3438.51E-081.50E-06
1794-IJ2Frequency Counter Module2,418,3214.14E-077.45E-06
1794-IP4Pulse Counter Module2,375,3604.21E-077.58E-06
1794-IR8RTD Input Module6,191,6551.62E-072.87E-06
1794-IRT8TC/RTD/mV Input Module1,182,4388.46E-071.56E-05
1794-IT8Thermocouple Input Module1,564,3246.39E-071.17E-05
1794-OB1616 Source Output Module1,883,5945.31E-079.62E-06
1794-OB16PProtected Output Module2,135,2804.68E-078.46E-06
1794-OB8EPProtected Output Module
(MTBF)
2,389,669
(1)
(2)
(3)
λ
4.18E-077.54E-06
Estimated PFD
1oo2
1794-OE4Analog Output Module23,807,0864.20E-087.41E-07
1794-OF4IIsolated Analog Output Module7,191,1281.39E-072.47E-06
1794-OW8Relay Output Module14,766,8766.77E-081.20E-06
1794-TB3Terminal Base Units
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-086.45E-07
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-083.79E-07
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
1794-TBNTerminal Base Units75,716,6151.32E-082.32E-07
1794-TBNFFused Terminal Base Units
1794-ACNR15XTControlNet Redundant Media Adapter8,223,6841.22E-072.15E-06
21,128,346
71,433,747
73,096,226
75,763,399
4,812,320
(2)
(2)
(2)
(2)
(2)
4.73E-088.35E-07
1.40E-082.46E-07
1.37E-082.41E-07
1.32E-082.32E-07
2.08E-073.70E-06
AB Drives
1Publication 1794-RM001G-EN-P - December 2011
A-2 Failure Estimates
Table A.1 MTBF Field Data and Per Module PFD Estimates - T1 = 1 year
Catalog Number:Description:
(MTBF)
(1)
(3)
λ
Estimated PFD
1oo2
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-071.45E-05
1794-OB8EPXT8 Protected Output Module14,771,0496.77E-081.20E-06
1794-IB16XT16 Sink Input Module35,587,1892.81E-084.95E-07
1794-OB16PXT16 Protected Output Module26,709,4013.74E-086.60E-07
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-087.94E-07
1794-OW8XT8 Relay Output Module18,518,5195.40E-089.53E-07
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-081.50E-06
1794-IE8XT8 Input analog Module14,041,0007.12E-081.26E-06
1794-OE4XT4 Output Analog Module11,381,7448.79E-081.55E-06
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-072.81E-06
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-072.43E-06
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-072.43E-06
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-073.24E-06
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-081.51E-06
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-072.16E-06
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1 / MTBF
Table A.2 MTBF Field Data and Per Module PFD Estimates - T1 = 2 years
Catalog Number:Description:
(MTBF)
(1)
λ
(3)
Estimated
PFD 1oo2
1794-ACN15ControlNet Single Media Adapter8,223,6841.22E-074.33E-06
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-074.33E-06
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-065.92E-05
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter 1,268,0707.89E-073.02E-05
1794-IB10XOB610 Input/6 Output Module4,943,4422.02E-077.27E-06
1794-IB1616 Sink Input Module4,105,0902.44E-078.79E-06
1794-IE8Analog Input Module37,952,6792.63E-089.28E-07
1794-IF2XOF2IIsolated Analog Input/Output Module25,296,9603.95E-081.39E-06
1794-IF4IIsolated Analog Input Module11,746,3438.51E-083.02E-06
1794-IJ2Frequency Counter Module2,418,3214.14E-071.52E-05
1794-IP4Pulse Counter Module2,375,3604.21E-071.55E-05
1794-IR8RTD Input Module6,191,6551.62E-075.77E-06
1794-IRT8TC/RTD/mV Input Module1,182,4388.46E-073.26E-05
Publication 1794-RM001G-EN-P - December 2011
Table A.2 MTBF Field Data and Per Module PFD Estimates - T1 = 2 years
1794-OE4Analog Output Module23,807,0864.20E-081.48E-06
1794-OF4IIsolated Analog Output Module7,191,1281.39E-074.96E-06
1794-OW8Relay Output Module14,766,8766.77E-082.40E-06
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-081.67E-06
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-081.29E-06
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-087.58E-07
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
1.40E-084.92E-07
(2)
1.37E-084.81E-07
(2)
1.32E-084.64E-07
1794-TBNTerminal Base Units75,716,6151.32E-084.64E-07
1794-TBNFFused Terminal Base Units
4,812,320
(2)
2.08E-077.47E-06
1794-ACNR15XTControlNet Redundant Media Adapter8,223,6841.22E-074.33E-06
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter 1,268,0707.89E-073.02E-05
1794-OB8EPXT8 Protected Output Module14,771,0496.77E-082.40E-06
1794-IB16XT16 Sink Input Module35,587,1892.81E-089.90E-07
1794-OB16PXT16 Protected Output Module26,709,4013.74E-081.32E-06
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-081.59E-06
1794-OW8XT8 Relay Output Module18,518,5195.40E-081.91E-06
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-083.00E-06
1794-IE8XT8 Input analog Module14,041,0007.12E-082.52E-06
1794-OE4XT4 Output Analog Module11,381,7448.79E-083.12E-06
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-075.66E-06
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-074.89E-06
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-074.89E-06
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-076.52E-06
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-083.03E-06
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-074.34E-06
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1 / MTB
AB Drives
Publication 1794-RM001G-EN-P - December 2011
A-4 Failure Estimates
Table A.3 MTBF Field Data and Per Module PFD Estimates - T1 = 5 years
Catalog Number:Description:
(MTBF)
(1)
(3)
λ
Estimated
PFD 1oo2
1794-ACN15ControlNet Single Media Adapter 8,223,6841.22E-071.10E-05
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-071.10E-05
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-061.79E-04
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-078.47E-05
1794-IB10XOB610 Input/6 Output Module4,943,4422.02E-071.88E-05
1794-IB1616 Sink Input Module4,105,0902.44E-072.28E-05
1794-IE8Analog Input Module37,952,6792.63E-082.33E-06
1794-IF2XOF2IIsolated Analog Input/Output Module25,296,9603.95E-083.50E-06
1794-IF4IIsolated Analog Input Module11,746,3438.51E-087.64E-06
1794-IJ2Frequency Counter Module2,418,3214.14E-074.05E-05
1794-IP4Pulse Counter Module2,375,3604.21E-074.13E-05
1794-IR8RTD Input Module6,191,6551.62E-071.48E-05
1794-IRT8TC/RTD/mV Input Module1,182,4388.46E-079.19E-05
1794-IT8Thermocouple Input Module1,564,3246.39E-076.62E-05
1794-OB1616 Source Output Module1,883,5945.31E-075.36E-05
1794-OB16PProtected Output Module2,135,2804.68E-074.65E-05
1794-OB8EPProtected Output Module
2,389,669
(2)
4.18E-074.10E-05
1794-OE4Analog Output Module23,807,0864.20E-083.73E-06
1794-OF4IIsolated Analog Output Module7,191,1281.39E-071.27E-05
1794-OW8Relay Output Module14,766,8766.77E-086.05E-06
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-084.21E-06
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-083.24E-06
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-081.90E-06
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
(2)
(2)
1.40E-081.23E-06
1.37E-081.20E-06
1.32E-081.16E-06
1794-TBNTerminal Base Units75,716,6151.32E-081.16E-06
1794-TBNFFused Terminal Base Units
Table A.3 MTBF Field Data and Per Module PFD Estimates - T1 = 5 years
Failure Estimates A-5
Catalog Number:Description:
(MTBF)
(1)
(3)
λ
Estimated
PFD 1oo2
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-084.00E-06
1794-OW8XT8 Relay Output Module18,518,5195.40E-084.81E-06
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-087.61E-06
1794-IE8XT8 Input analog Module14,041,0007.12E-086.37E-06
1794-OE4XT4 Output Analog Module11,381,7448.79E-087.89E-06
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-071.45E-05
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-071.25E-05
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-071.25E-05
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-071.68E-05
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-087.67E-06
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-071.11E-05
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1 / MTBF
Table A.4 MTBF Field Data and Per Module PFH Estimates - T1 = 1 year
Catalog Number:Description:
(MTBF)
(1)
λ
(3)
Estimated
PFH 1oo2
1794-ACN15ControlNet Single Media Adapter8,223,6841.22E-078.64E-10
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-078.64E-10
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-061.19E-08
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter
Table A.4 MTBF Field Data and Per Module PFH Estimates - T1 = 1 year
Catalog Number:Description:
(MTBF)
(1)
λ
(3)
Estimated
PFH 1oo2
1794-OE4Analog Output Module23,807,0864.20E-082.96E-10
1794-OF4IIsolated Analog Output Module7,191,1281.39E-079.90E10
1794-OW8Relay Output Module14,766,8766.77E-084.78E-10
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-083.33E10
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-082.57E10
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-081.51E10
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
1.40E-089.82E11
(2)
1.37E-089.59E11
(2)
1.32E-089.25E11
1794-TBNTerminal Base Units75,716,6151.32E-089.26E-11
1794-TBNFFused Terminal Base Units
4,812,320
(2)
2.08E-071.49E09
1794-ACNR15XTControlNet Redundant Media Adapter8,223,6841.22E-078.64E-10
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter
1,268,070
(2)
7.89E-076.05E-09
1794-OB8EPXT8 Protected Output Module14,771,0496.77E-084.78E-10
1794-IB16XT16 Sink Input Module35,587,1892.81E-081.97E-10
1794-OB16PXT16 Protected Output Module26,709,4013.74E-082.63E-10
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-083.17E-10
1794-OW8XT8 Relay Output Module18,518,5195.40E-083.80E-10
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-085.99E-10
1794-IE8XT8 Input analog Module14,041,0007.12E-085.03E-10
1794-OE4XT4 Output Analog Module11,381,7448.79E-086.22E-10
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-071.13E-09
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-079.75E-10
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-079.75E-10
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-071.30E-09
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-086.04E-10
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1 / MTBF
Publication 1794-RM001G-EN-P - December 2011
Table A.5 MTBF Field Data and Per Module PFH Estimates - T1 = 2 years
Failure Estimates A-7
Catalog Number:Description:
1794-ACN15ControlNet Single Media Adapter 8,223,6841.22E-078.76E-10
1794-ACNR15ControlNet Redundant Media Adapter8,223,6841.22E-078.76E-10
1794-AENT10/100Mb Ethernet Communication Adapter691,1341.45E-066.58E-09
1794-AENTR10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-076.58E-09
1794-IB10XOB610 Input/6 Output Module4,943,4422.02E-071.49E-09
1794-IB1616 Sink Input Module4,105,0902.44E-071.81E-09
1794-IE8Analog Input Module37,952,6792.63E-081.86E-10
1794-IF2XOF2IIsolated Analog Input/Output Module25,296,9603.95E-082.79E-10
1794-IF4IIsolated Analog Input Module11,746,3438.51E-086.08E-10
1794-IJ2Frequency Counter Module2,418,3214.14E-073.19E-09
1794-IP4Pulse Counter Module2,375,3604.21E-073.25E-09
1794-IR8RTD Input Module6,191,6551.62E-071.18E-09
1794-IRT8TC/RTD/mV Input Module1,182,4388.46E-077.14E-09
1794-IT8Thermocouple Input Module1,564,3246.39E-075.17E-09
1794-OB1616 Source Output Module1,883,5945.31E-074.20E-09
1794-OB16PProtected Output Module2,135,2804.68E-073.65E-09
1794-OB8EPProtected Output Module
1794-OF4IIsolated Analog Output Module7,191,1281.39E-071.01E-09
1794-OW8Relay Output Module14,766,8766.77E-084.82E-10
1794-TB3Terminal Base Units
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-082.59E-10
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-081.52E-10
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
1794-TBNTerminal Base Units75,716,6151.32E-089.27E-11
1794-TBNFFused Terminal Base Units
1794-OE4Analog Output Module23,807,0864.20E-083.02E-10
1794-OF4IIsolated Analog Output Module7,191,1281.39E-073.76E-10
1794-OW8Relay Output Module14,766,8766.77E-084.94E-10
1794-TB3Terminal Base Units
21,128,346
(2)
4.73E-083.41E-10
1794-TB3GGeneric Terminal Base Units27,320,8003.66E-082.62E-10
1794-TB3GSGeneric Terminal Base Units46,425,6002.15E-081.53E-10
1794-TB3STerminal Base Unit
1794-TB3TTemperature Terminal Base Units
1794-TB3TSTemperature Terminal Base Units
71,433,747
73,096,226
75,763,399
(2)
(2)
(2)
1.40E-089.88E-11
1.37E-089.66E-11
1.32E-089.31E-11
1794-TBNTerminal Base Units75,716.6151.32E-089.32E-11
1794-TBNFFused Terminal Base Units
4,812,320
(2)
2.08E-071.64E-09
1794-ACNR15XTControlNet Redundant Media Adapter8,223,6841.22E-079.14E-10
1794-AENTRXT10/100Mb Ethernet Redundant Communication Adapter1,268,0707.89E-078.17E-09
1794-OB8EPXT8 Protected Output Module14,771,0496.77E-084.93E-10
1794-IB16XT16 Sink Input Module35,587,1892.81E-082.00E-10
1794-OB16PXT16 Protected Output Module26,709,4013.74E-082.68E-10
1794-IB10XOB6XT10 Input/6 Output Combo Module22,202,4874.50E-083.24E-10
1794-OW8XT8 Relay Output Module18,518,5195.40E-083.90E-10
1794-IE4XOE2XT4 Input/2 Output Analog Combo Module11,800,8028.47E-086.24E-10
1794-IE8XT8 Input analog Module14,041,0007.12E-085.20E-10
1794-OE4XT4 Output Analog Module11,381,7448.79E-086.48E-10
1794-IF2XOF2IXT2 Input/2 Output Isolated Analog Combo Module6,317,9181.58E-071.21E-09
1794-IF4IXT4 Isolated Input Analog Module7,297,1401.37E-071.04E-09
1794-IF4ICFXT4 Isolated Input Analog Module7,297,1401.37E-071.04E-09
1794-OF4IXT4 Isolated Output Analog Module5,493,9021.82E-071.42E-09
1794-IJ2XT2 Ch. Frequency Counter Module11,714,1288.54E-086.29E-10
1794-IRT8XT8 TC/RTD Input Analog Module8,204,7921.22E-079.16E-10
(1)
MTBF measured in hours.
(2)
Calculated using field-based values for components
(3)
λ = Failure Rate = 1 / MTBF
AB Drives
Publication 1794-RM001G-EN-P - December 2011
A-10 Failure Estimates
Notes:
Publication 1794-RM001G-EN-P - December 2011
Index
A
Analog input modules 3-7–3-8
Analog output modules 3-13–3-15
Application program
Technical SIL2 requirements
5-1
C
Calibration 3-7, 3-13
Communication
ControlNet
Communications modules 2-1
ControlNet module 2-1
Documentation 2-3
Control and information protocol
Definition
ControlNet module 2-1
2-1
Preface-1
D
Diagnostic coverage
Definition
Documentation
Communications modules
Preface-1
2-3
E
European norm.
Definition
Preface-1
F
Fault reporting
Analog input modules
Analog output modules 3-14
Digital input modules 3-3
Digital output modules 3-4, 3-5
3-7
G
Get system value (GSV)
Defintion
Preface-1
I
I/O modules 3-1–3-19
Analog input modules 3-7–3-8
Analog output modules 3-13–3-15
Calibration 3-7, 3-13
Digital input modules 3-2–3-4
Digital output modules 3-6
Fault reporting 3-3, 3-4, 3-5, 3-7, 3-14
Proof tests 3-2, 3-4, 3-7, 3-13
AB Drives
Wiring analog input modules 3-9–3-15
Wiring analog output modules 3-16–
3-17
Wiring digital input modules 3-3
Wiring digital output modules 3-5, 3-6
M
Mean time between failures (MTBF)
Definition
Mean time to restoration
Definition
Preface-2
Preface-2
P
Probability of failure on demand (PFD)
1-8–1-11
Calculations for each catalog number
1-8
Definition Preface-2
Probability of failure per hour (PFH) 1-8–
1-11
Calculations for each catalog number
1-10
Definition Preface-2
Proof tests 1-3, 3-2, 3-4, 3-7, 3-13
R
RSLogix 5000 Preface-2
General requirements 4-1
S
SIL compliance
Distribution and weight
SIL loop example 1-2
SIL2 requirements
For the application program
SIL2-certified components
Complete list of ControlLogix catalog
numbers
Software
General requirements
RSLogix 5000 Preface-2
Spurious failure estimates A-1
1-13
5-1
1-5
4-1
T
Terminology
Used throughout manual
Preface-1
W
Publication 1794-RM001G-EN-P - December 2011
2 Index
Wiring I/O modules
Analog input modules
3-9–3-15
Analog output modules 3-16–3-17
Digital input modules 3-3
Digital output modules 3-5, 3-6
Publication 1794-RM001G-EN-P - December 2011
AB Drives
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at http://www.rockwellautomation.com/support/americas/phone_en.html, or contact
New Product Satisfaction Return
Rockwell Automation 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 and needs to be returned, follow these procedures.
United StatesContact your distributor. You must provide a Customer Support case number (call the phone number above to obtain
Outside United StatesPlease contact your local Rockwell Automation representative for the return procedure.
one) to your distributor to complete the return process.
Documentation Feedback
You r c omm ent s will help us serve your documentation needs better. If you have any suggestions on how to improve this document,
complete this form, publication RA-DU002
, available at http://www.rockwellautomation.com/literature/.