FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
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.
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.
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.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
Labels may also be on or inside the equipment to provide specific precautions.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may
be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach
dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc
Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements
for safe work practices and for Personal Protective Equipment (PPE).
2Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
Preface
Why Read This Manual
Who Should Use This
Manual
About the Vocabulary
This manual shows you how to use your FLEX™ I/O analog modules with the
ControlNet® products and ControlNet network, and Ethernet products and
EtherNet/IP™ network. The manual helps you install, program, and troubleshoot
your module. This manual:
You must be able to program and operate a ControlNet product and ControlNet
or Ethernet network to make efficient use of a FLEX I/O module.
In this manual, we refer to the:
• 1794-IF8IH and 1794-IF8IHNFXT as the input modules
• 1794-OF8IH as the output module
Related Documentation
The following documents contain additional information concerning
Rockwell Automation® office or distributor.
The following conventions are used throughout this manual:
in this Manual
Information on wiring and installing the 1794-IF8IH HART input module.
Information on wiring and installing the 1794-OF8IH HART output module.
Information on wiring and installing the 1794-IF8IHNFXT HART XT input module.
A description and overview of the 1794 and 1797 series FLEX I/O modules
compatible control platforms, and overview of how to specify a FLEX I/O system.
Web updates for FLEX I/O and FLEX EX I/O DTM libraries.
More information on proper wiring and grounding techniques.
.A glossary of industrial automation terms and abbreviations.
• Bulleted lists such as this one provide information, not procedural steps.
• Numbered lists provide steps or hierarchical information.
• Italic type is used for emphasis.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Notes:
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Summary of Changes
This manual contains new and updated information. Changes throughout this
revision are marked by change bars, as shown to the right of this paragraph.
New and Updated
Information
This table contains the changes made to this revision.
TopicPage
Corrected wiring diagram35
Corrected wiring instructions36
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Notes:
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Chapter
IMPORTANT
IMPORTANT
IMPORTANT
1
About the FLEX I/O HART Analog Modules
Overview
This chapter describes the FLEX I/O Highway Addressable Remote Transducer
(HART) analog modules and what you must know and do before you begin to
use them.
Read this chapter to familiarize yourself with the HART analog modules.
TopicPage
What FLEX I/O Analog Modules Do13
Communicate with Programmable Controllers14
Use Alarms on the Input Modules15
Use the HART Capabilities17
HART Implementation Overview18
Chapter Summary18
To use all features of these modules it must be used with the
1794-ACN(R)15 with version 5.001 firmware or later, or the
1794-AENT with firmware revision 4.002 and later, or the
1794-AENTR with firmware version 1.011 and later.
For more information about using these modules with 1794-ACN(R)15
with firmware revision 5.001 and later, see 1794-RN071
.
Studio 5000 Logix Designer version 24 includes a full profile for
1794-IF8IHNFXT module. You cannot use the 1794-IF8IH profile to
configure the 1794-IF8IHNFXT module.
See Use the 1794-IF8IHNFXT with the Generic and Thin Profiles on
page 153 if you are using RSLogix 5000 version 23 or earlier.
The Studio 5000 Logix Designer application is the re-branding of the
RSLogix 5000 application.
What FLEX I/O Analog
The FLEX I/O HART input and output modules must be used in a ControlNet
or EtherNet/IP network.
Modules Do
The 1794-IF8IH module accepts up to eight analog inputs. The inputs are
isolated and will accept current in either of the following two ranges: 4…20 mA
or 0…20 mA. The default input range is 0…20 mA. The inputs have both fixed
hardware filters and selectable firmware digital filters.
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The 1794-IF8IHNFXT module supports 0…20 mA and 4…20 mA ranges, with
a default input range of 0…20 mA. It has seven selectable input filters and seven
input data formats. It provides support for loop alarm, which detects gross signal
errors such as open and short circuit. It has programmable user alarms (high, low,
remote high high, and remote low low). The module has a HART modem per
channel. It is compliant with HART versions 5, 6, and 7, except for multi-drop
support.
The 1794-OF8IH module provides as many as eight (8) analog outputs. The
outputs are isolated and will provide current in either of the following two
ranges: 4…20 mA or 0…20 mA. The default output range is 0…20 mA.
Each module offers:
• full functionality without switches or jumpers.
• multiple data ranges that can be independently programmed for each
• lead breakage detection.
• overrange/underrange alarms.
• remote transmitter alarm.
channel.
Communicate with
Programmable Controllers
Data connections are established between the FLEX I/O module and an
Allen-Bradley® programmable controller (PLC) to transfer information between
the two at a scheduled rate.
Input module information is then automatically made available in the PLC data
table through the data connection. Reciprocally, output data information
determined by the PLC program is also automatically transferred from the PLC
data table to the output module through the data connection.
In addition, when the data connection is originally established, configuration
information for the module is automatically transferred to it via the network.
Events Following Powerup
You must apply +24V DC power to your FLEX I/O analog I/O modules. The
following sequence of events occurs after power has initially been applied to your
module:
1. The module status indicator will blink red until a connection is established
and a valid configuration is passed to the module.
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Module type
Removable label
Keyswitch
(indicator is at #3)
Power On indicator
Input designators
44811
2. After the diagnostic check, module configuration information, selected by
the user and downloaded over the network, is applied by the module. For
more information on configuration options, refer to Configurable FLEX
I/O Analog Module Features on page 19.
3. Following the module configuration download for the 1794-IF8IH and
1794-IF8IHNFXT modules, the module begins producing runtime data
for the PLC processor.
Following the module configuration download for the 1794-OF8IH
module, the module applies configuration data to output channels.
4. If any diagnostics or alarms are generated during normal module
operation, the data is returned to the PLC processor.
Physical Features of
Your Module
The module label identifies the key-in position, wiring, and module type. Use the
removable label to note individual designations per your application.
Indicators
Indicators are provided to identify input or output fault conditions, and to show
when power is applied to the module. For example, the 1794-IF8IH module is
shown below.
8 CH HART ISOLATED ANALOG INPUT
IN1IN0IN2IN3IN4
IN5
1794-IF8IH
IN6IN7
3
PWR
Use Alarms on the Input
Modules
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The 1794-IF8IH and 1794-IF8IHNFXT FLEX I/O modules are capable of
generating four alarms:
• Low Alarm
• High Alarm
•Remote Fault
•Local Fault
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
These alarm conditions are described in general terms and as they relate to bits on
the FLEX I/O module on the following pages.
Low Alarm
The low alarm notifies you when module input signal moves below the
configured low alarm trigger point. If the input signal falls below 0% (4 mA), a
Low Alarm is generated.
High Alarm
The high alarm works converse to the low alarm. This feature notifies you when
the input signal falls above the configured high alarm trigger point. If the input
signal falls above 0% (4 mA), an Underrange Alarm is generated.
Remote Fault Alarm
The remote fault alarm is intended for use with remote transmitter loops.
For example, the remote transmitter may be measuring temperature and
converting it to a standard mA signal. In such a loop, though, the input module
cannot determine the state of the loop on the far side of the transmitter.
However, the remote transmitter may be capable of diagnosing a problem in the
remote loop and signal the input module local loop with a preprogrammed
out-of-range (high or low) value.
The Fault Enable bit allows the 1794-IF8IH and 1794-IF8IHNFXT modules to
work with transmitters like the one described.
Once the alarm is issued, it remains active as long as the input signal
value remains above or below the programmed value.
Use Remote Fault Alarm to Determine High-High or Low-Low Alarm Levels
If you do not have a remote transmitter in your loop, this alarm can also be used
to program a high-high or low-low alarm level between the levels, which actuate
the overrange or underrange alarms and the high or low local fault alarms.
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IMPORTANT
Programming the Remote Fault Alarm
For the remote fault alarm, you must program the threshold in 0.1 mA steps at
any level on the high or low end of input signal range. The remote fault alarm
activates if your I/O module receives input signal values of:
• 100.63…111.88% (20.1…21.9 mA) on the high end of input signal range
or
• -0.63…-11.88% (3.9…2.1 mA) on the low end of input signal range.
Local Fault Alarm
The local fault alarm notifies you when the loop to the transmitter or field device
(if no transmitter is used) is open or shorted.
Use the HART Capabilities
Once the alarm is issued, it remains active as long as the input signal
value remains in the programmed range.
• 112.50% (22 mA) or higher on the high end of input signal range.
This value indicates a short in the loop.
or
• -12.50% (2 mA) or lower on the low end of input signal range.
This value indicates an open wire condition in the loop.
The remote fault and local fault alarms are issued with the same bit whether the
cause is an under or overrange. Monitor the overrange and underrange bits in
your programming software to determine if the problem is a high current or low
current.
Before using the HART capabilities, be sure that:
• the I/O module and the associated field device are working properly in the
analog 4…20 mA mode.
• the I/O module is configured for 4…20 mA range.
• the field device is HART capable.
• no multiple HART field device is connected to each channel.
• input filtering is set to a valid (defined) value.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Processor
User program
AdapterFLEX I/O
HART
module
HART
Field Device
Command
Response
for example, HART
Command 3)
Flexbus
4…20 mA with
HART signal
HART Implementation
Overview
The FLEX I/O HART modules act as intelligent HART multiplexers. Basically,
the module learns which HART devices are attached to its channels and then
routes HART messages, as appropriate, between the HART field devices and the
Flexbus. Since the HART modules act as intelligent HART multiplexers, HART
commands can be issued to the HART modules themselves.
Communication on the Flexbus occurs between the adapter and the HART
module. The adapter converts these messages to the appropriate network format
for communication with the controlling processor. The controlling processor gets
its command from the user program, storing the responses in its memory.
Chapter Summary
In this chapter, you learned about FLEX I/O analog I/O modules and HART
module capabilities. Read the next chapter to learn about configurable features
on your module.
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Chapter
IMPORTANT
Configurable FLEX I/O Analog Module
Features
2
Overview
Read this chapter to familiarize yourself with configurable features on the input
and output analog modules.
TopicPage
Select Your Analog Input Module Operating Features20
Select Your Analog Output Module Operating Features21
Understand Image Table Mapping and Bit/Word Descriptions24
Chapter Summary25
HART configurable features described in this chapter include the following
1794-IF8IH and 1794-IF8IHNFXT
Input Modules
Fault ModeOutput Enable
High Low Error LevelModule Fault State Mode
Input Filter CutoffLocal Fault Mode
Data FormatData Format
1794-OF8IH Output Module
Global Reset
Analog Fault State
Latch Retry Mode
Fault Alarm
You must use the I/O configuration portion of your PLC
programming software to select and configure these features
for 1794-IF8IH and 1794-OF8IH modules. This manual
assumes familiarity with the programming software. A brief
description of each module feature is provided here.
To learn more about configuration for the 1794-IF8IH and
1794-OF8IH modules, see the following:
Configuration on page 39
Use the 1794-IF8IH Module with the Generic Profile on page 137
Use the 1794-OF8IH Module with the Generic Profile on page 177
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IMPORTANT
IMPORTANT
IMPORTANT
Configuration for the 1794-IF8IHNFXT module is done through
Logix Designer software version 24. See Edit Your 1794-IF8IHNFXT
Configuration with Studio 5000 Logix Designer (Full Profile) on page 90.
See Use the 1794-IF8IHNFXT with the Generic and Thin Profiles on page
153 if you are using RSLogix 5000® version 23 or earlier.
Select Your Analog Input
Module Operating Features
All features of the 1794-IF8IH and the 1794-IF8IHNFXT analog input
modules are independently configurable.
The default selection value for all parameters is 0.
Fault Enable
Your input modules are capable of indicating various fault conditions, depending
on the input signal value. Use the Fault Enable feature to enable or disable two
alarms:
• Remote Fault Alarm
•Local Fault Mode
Use your programming software to set the Fault Enable bit to 0 to disable these
alarms. Set the bit to 1 to enable them.
Fault Enable will only enable or disable the Remote and
Local Fault alarms. It does not affect the Underrange and
Overrange alarms. They are always active.
For more information, see Remote Fault Alarm
Alarm on page 17.
Sample Filter Frequency Rates
Six available input filter settings for the 1794-IF8IH module and seven input
filter settings for the 1794-IF8IHNFXT module allow you to choose the best
rolloff frequency for input channels on your I/O module. When choosing a filter,
remember that time filter selection affects your input signal’s accuracy.
For example, if you choose the highest frequency of 470 Hz (filter 0) for the
1794-IF8IH module, signal noise is more likely to affect the reading, but the
slowest frequency of 4.17 Hz (filter 5) provides the most accurate signal due to
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on page 16 and Local Fault
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
incoming noise filtering. It is recommended that you use 62 Hz when HART is
enabled to get more accurate signals due to incoming noise.
See the Input Filter Frequency table to decide which input filter to use in your
FLEX I/O analog I/O application:
Input Filter Frequency for the 1794-IF8IH Module
01234567
470 Hz62 Hz19.6 Hz16.7 Hz10 Hz4.17 Hzn/an/a
Input Filter Frequency for the 1794-IF8IHNFNXT Module
01234567
242 Hz123 Hz62 Hz19.6 Hz16.7 Hz10 Hz4.17 Hzn/a
(1)
To configure input filter frequency and other module features for 1794-IF8IHNFXT module in Studio 5000 Logix
Designer see 1794-IF8IHNFXT Configuration Data Table on page 43
(1)
.
Choose the best input filter cutoff in your programming software.
Data Formats
You must choose a module data format in your user program. Six data formats are
available for the 1794-IF8IH module, and seven data formats for the
1794-IF8IHNFXT module.
Default format is 0
The data format selected interprets input readings and returns them to the PLC.
See the Data Format (Configuration Words 2, 3 – bits 0…3, 4…7, 8…11, 12…15)
on page 49 for Data Format tables and a more detailed description of data
formats for the 1794-IF8IH and 1794-IF8IHNFXT modules.
…20 mA.
Select Your Analog Output
Module Operating Features
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To configure data formats and other module features for 1794-IF8IHNFXT
module in Logix Designer, see 1794-IF8IHNFXT Channel Data Formats on
page 51.
All features of the 1794-OF8IH analog output module are independently
configurable.
The default selection value for all parameters is 0.
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Local Fault Mode
The Local Fault Mode can be programmed to determine how the module
responds to communications faults and internal module faults.
When setting the Local Fault Mode feature in your programming software, set
this feature’s bit to 0 to use the analog fault state or digital fault state only if a
communications fault occurs. Set the bit to 1 to use the Analog Fault state or
Digital Fault state if any fault occurs.
Analog fault state and digital fault state determine how the module reacts to
faults when a channel is used in analog mode or digital mode, respectively.
Latch Mode
Latch Mode determines channel operation under wire-off or lead-break fault
conditions. This feature is available for each channel. Channel detection occurs
on a continuous basis. If a fault is detected, the channel fault alarm is set.
If Latch mode is enabled when a fault occurs, the fault will remain latched in its
fault state until a Global Reset is issued. If Latch mode is disabled when a fault
occurs, the channel reports a fault until the fault is corrected. Global Reset is not
necessary if Latch mode is disabled.
When using your programming software, set the Latch mode bit to 0 to disable
the feature. Set the bit to 1 to enable it.
Global Reset
Global Reset works in conjunction with Latch mode during fault conditions. If
Latch mode is enabled and a fault condition occurs, the channel operating with a
fault remains in this condition (with analog or digital fault state implied) until a
Global Reset is issued. The Global Reset feature resets all outputs of a particular
channel group to accept normal system output data.
The Global Reset feature is an edge triggered signal. Use your programming
software to set the Global Reset bit to 1 for normal operation. Resetting of
outputs occurs during the 1...0 transition.
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Diagnostic Data error 11
= data out of range
Diagnostic Data error 11
= data out of range
04812162024
Output mA
Datatable
20.000
16.000
12.000
8.000
4.000
0.000
-4.000
Data Format
You must choose a module data format in your user program. See 1794-OF8IH
Data Formats on page 77 for an explanation of each bit. Data Formats 2, 5, 6, 8, 9,
10, 11, 12, 13 and 15 are not assigned.
When choosing a data format, remember the following:
• If an unassigned Analog Data Format is selected, the module sets
Diagnostic Data to 2 for configuration failure and puts affected channels
in the corresponding fault state.
• An unconfigured module channel can be assumed to have the default
configuration Analog Data Format 0, 0...20 mA and Analog Mode Fault
State minimum range. If a non-assigned format is selected, then the
diagnostic 2 for configuration failure is set and the module channel goes to
the default fault state minimum range.
• If on the other hand, the configuration had been changed, from the
default, and then it was changed again to a non-assigned format, then the
diagnostic bit 2 for configuration failure is set and the module goes to the
fault state for the last valid configuration.
• Formats 13 and 14 are 2’s complement data formats, and require data to
the module in that form.
• Range: 0…15
•Default: 0
• Data Table Reference: data format, word 12 and 13, bits 0…3, bits 4…7
If the data is sent to the module, which is out of range, the value will be clipped
and Diagnostic Data will be set to 11 data out of range.
Example of Analog Format 14 and Data Clipping Performance.
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For data format tables and a more detailed description of the data formats for the
1794-OF8IH module, see Data Format (Configuration Words 2, 3 – bits 0…3,
4…7, 8…10, 12…15) on page 76.
Fault Alarm
Fault Alarm selects whether the channel fault detection is enabled or disabled.
There is a 100 Hz (10 ms) filter for wire off or lead break detection.
Use your programming software to set the Fault Alarm. Set the feature bit to 0 to
disable the alarm. Set the bit to 1 to enable wire off/lead break fault detection.
Understand Image Table
All Allen-Bradley FLEX I/O modules have a sixteen word table of Real Time
Data (RTD) to be transferred between the controller and the I/O module. Not
Mapping and Bit/Word
all 16 words need be allocated.
Descriptions
1794-IF8IH Analog Data Table
WordBit
1514131211109876543210
0Channel 0 Input Data
1Channel 1 Input Data
2Channel 2 Input Data
3Channel 3 Input Data
4Channel 4 Input Data
5Channel 5 Input Data
6Channel 6 Input Data
7Channel 7 Input Data
8 H7H6H5H4H3H2H1H0L7L6L5L4L3L2L1L0
9R7 R6 R5R4 R3R2R1R0P7P6P5P4P3P2 P1P0
10ReservedDiagnostic Status
11C7C6C5C4C3C2C1C0F7F6F5F4F3F2F1F0
12X7X6X5X4X3X2X1X0Reserved
Where: Hn: Channel n High Alarm
Ln: Channel n Low Alarm
Pn: Channel n Out Of Range Alarm
Rn: Channel n Second (Remote) Alarm
Fn: Channel n HART Failure
Cn: Channel n HART Current Fault
Xn: Channel n HART Transmitter Present
0: False 1: True
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
1794-IF8IHNFXT Analog Data Table
WordBit
1514131211109876543210
0Channel 0 Input Data
1Channel 1 Input Data
2Channel 2 Input Data
3Channel 3 Input Data
4Channel 4 Input Data
5Channel 5 Input Data
6Channel 6 Input Data
7Channel 7 Input Data
8H7 H6H5H4H3H2H1H0L7L6 L5 L4 L3L2 L1 L0
9R7 R6R5R4R3R2R1R0P7P6 P5P4P3P2 P1P0
10
11C7C6C5C4C3C2C1C0F7F6F5F4F3F2F1F0
Where: Hn: Channel n High Alarm
(1)
X7
X6X5X4X3X2X1X0Diagnostic Status
Ln: Channel n Low Alarm
Pn: Channel n Out Of Range Alarm
Rn: Channel n Second (Remote) Alarm
Fn: Channel n HART Failure
Cn: Channel n HART Current Fault
Xn: Channel n HART Transmitter Present
0: False 1: True
(1)
When Xn is set, a device is connected and a has a valid device information Data-Set™ available. This bit will clear if the channel is inhibited, the device is removed, or the
device is faulted, and will not be set again until a complete device information set is successfully regathered. Words S:0…S:3 are input data classified as Status Words
but in RSLogix™ generic profile, these words are shown as tags I:8…I:11.
1794-IF8IHNFXT Output Analog Data Table
WordBit
1514131211109876543210
0RRRRRRRRHO7HO6HO5HO4HO3HO2HO1HO0
Where: HOn: Channel n HART Off Dynamic Control bit
0: False 1: True
Chapter Summary
In this chapter, we told you about the FLEX I/O system and the analog I/O
modules, and how they communicate with programmable controllers. Move on
to the next chapter to learn how to install your FLEX I/O analog module.
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Notes:
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Chapter
Install Your FLEX I/O Analog Modules
3
Overview
Before You Install Your
Analog Module
Read this chapter to install the input and output analog modules.
TopicPage
Before You Install Your Analog Module27
Removal and Insertion Under Power27
Install the Module28
Wire the Terminal Base Units34
Connect Wiring to the FLEX I/O HART Analog Modules34
Ground the Module38
Chapter Summary38
Before installing your FLEX I/O analog module:
You Need ToAs Described Under
Verify that the module will be installed in a
suitable enclosure
Position the keyswitch on the terminal baseInstall the Module on page 28
Removal and Insertion Under Power
page 27
on
ATTENTION: These modules do not receive primary operational
power from the backplane. +V and -V DC power must be applied to
your module before installation. If power is not applied, the module
position will appear to the adapter as an empty slot in your chassis.
Removal and Insertion
Under Power
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WARNING: These modules are designed so you can remove and insert
them under power. However, take special care when removing or
inserting these 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.
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
WARNING: When used in a class I, division 2, hazardous location,
this equipment must be mounted in a suitable enclosure with proper
wiring method that complies with the governing electrical codes.
Install the Module
Installation of the module consists of the following:
•Mounting the terminal base unit.
• Installing the analog I/O module into the terminal base unit.
• Installing the connecting wiring to the terminal base unit.
If you are installing your module into a terminal base unit that is already installed,
proceed to page 32.
ATTENTION: Do not use the unused terminals on the terminal base
unit. Using the terminals as supporting terminals can result in damage
to modules and/or unintended operation of your system.
Mount on a DIN Rail
ATTENTION: Do not remove or replace a terminal base unit when
power is applied. Interruption of the Flexbus can result in unintended
operation or machine motion.
Install the Terminal Base Unit
1. Remove the cover plug in the male connector of the unit to which you are
connecting this terminal base unit.
2. Check to make sure that the 16 pins in the male connector on the adjacent
device are straight and in line so that the mating female connector on this
terminal base unit will mate correctly.
3. Verify that the female Flexbus connector is fully retracted into the base
unit.
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4. Position the terminal base at a slight angle and hooked over the top of the
35 x 7.5 mm DIN rail A
(Allen-Bradley part number 199-DR1)
5. Slide the terminal base over tight against the adapter (or proceeding
terminal base). Make sure the hook on the terminal base slides under the
edge of the adapter (or proceeding terminal base) and the Flexbus
connector is fully retracted.
ATTENTION: Do not force the terminal base into the adjacent
modules. Forcing the units together can bend or break the hook and
allow the units to separate and break communication over the
backplane.
6. Rotate the terminal base onto the DIN rail with the top of the rail hooked
under the lip on the rear of the terminal base.
Use caution to make sure that the female Flexbus connector does not
strike any of the pins in the mating male connector.
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7. Press down on the terminal base unit to lock the terminal base on the DIN
rail. If the terminal base does not lock into place, use a screwdriver or
similar device to open the locking tab, press down on the terminal base
until flush with the DIN rail and release the locking tab to lock the base
in place.
Gently push the Flexbus connector into the side of the adapter (or
proceeding terminal base) to complete the backplane connection.
8. For specific wiring information, see the installation instructions for the
module you are installing in this terminal base unit.
Terminal assignments are also given later in this chapter, see page 34.
9. Repeat the above steps to install the next terminal base unit.
Be sure the Flexbus connector cover on the last terminal base unit is
in place.
Mount on a Panel or Wall
Installation of a FLEX I/O system on a wall or panel consists of:
• laying out the drilling points on the wall or panel.
• drilling the pilot holes for the mounting screws.
• mounting the adapter mounting plate.
• installing the terminal base units and securing them to the wall or panel.
If you are installing your module into a terminal base unit that is already installed,
proceed to Mount the Analog Modules on the Terminal Base Unit on page 32.
30Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
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