Rockwell Automation Allen-Bradley 871FM-M7BA20-x User manual

Miniature Metal Flat Pack Inductive Sensors with IO-Link
Catalog Numbers 871FM-M7BA20-x, 871FM-MV7BA20-FD02X, 871FM-M10BA30-x, 871FM-MV10BA30-x
User Manual
Original Instructions

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.
Labels may also be on or inside the equipment to provide specific precautions.
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.
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).

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 3
Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Who Should Use This Manual? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Overview and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Terminology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 1
Product Overview Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 2
Installation Status Indication User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 3
871FM Miniature Metal Flat Pack
with IO-LinkOverview
What Is IO-Link? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Why IO-Link? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Seamless Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Real-time Diagnostics and Trending . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensor Health Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Device Profiles and Automatic Device Configuration. . . . . . . . . 16
Descriptive Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
How Does IO-Link Work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Transmission Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Transmission Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Response Time of the IO-Link System . . . . . . . . . . . . . . . . . . . . . . 17
IO-Link Data Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Process Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Value Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Device Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Access IO-Link Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Cyclic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Acyclic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Start-up the I/O System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Assign Device Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Premier Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
871FM Sensor IO-Link Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Correlation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Automatic Device Configuration (ADC) . . . . . . . . . . . . . . . . . . . . . . . 22

4Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Table of Contents
Chapter 4
Configure the 871FM Sensor for
IO-Link Mode
Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Example: Setup the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Chapter 5
Create a Project Begin a New Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 6
Configure the IO-Link Master Configuration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
AOP Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 7
Connect the 871FM Sensor to the
IO-Link Master
Connection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter 8
Register the 871FM IODD Registration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 9
Review the 1734-4IOL IO-Link AOP Overview — Device Parameter Behavior . . . . . . . . . . . . . . . . . . . . . . . . 47
Common Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Identification Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Observation Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Parameter Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Operation Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Sensor Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Counter/Timer Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Data Mapping Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Diagnosis Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Device Access Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Service Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Operation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Communication Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Manage Parameter Differences between IO-Link Devices
and Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Chapter 10
Install the 871FM Sample Code
Add-On Instruction
Download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
AOP Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Change Operation State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Chapter 11
Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 5
Table of Contents
Appendix A
Install the Add-on Profile Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Perform the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Appendix B
Device Parameters Identification Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Observation Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Parameter Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Diagnosis Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Process Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Appendix C
Error Codes and Events Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Appendix D
Explicit Messaging Examples Service Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Write Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Read Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Write Subindex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Read Subindex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Byte Swapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

6Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Table of Contents
Notes:

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 7
Preface
This manual is a reference guide for Bulletin 871FM inductive sensors with
IO-Link. It describes the procedures that you use to install, configure,
troubleshoot, and use these sensors.
Who Should Use
This Manual?
Use this manual if you are responsible for installation, configuration, or
troubleshooting 871FM miniature metal flat pack inductive sensors with
IO-Link.
Overview and Benefits Rockwell Automation is the only supplier who provides every piece of the
Connected Enterprise solution from top to bottom. Plus, exclusive features,
and Premier Integration between Allen-Bradley components and an Integrated
Architecture® system allow for a seamless connection and commission of
control components. Empowers the ability to reap the benefits of an IO-Link
solution with access to more detailed and customized plant-floor information
than other solutions can offer.
Terminology The following abbreviations are used in this publication.
Table 1 - Abbreviations
Additional Resources These documents contain additional information concerning related products
from Rockwell Automation.
You can view or download publications at
http://www.rockwellautomation.com/global/literature-library/overview.page.
To order paper copies of technical documentation, contact your local
Allen-Bradley distributor or Rockwell Automation sales representative.
Abbreviation Definition
ADC Automatic Device Configuration
AOI Add-On Instruction
AOP Add-on Profile
ASN Application Specific Name
IEC International Electrotechnical Commission
IODD I/O Device Description
NEC National Electric Code
QD Quick Disconnect
SIO Standard I/O
Resource Description
871FM Inductive Sensors with IO/Link Interface User
Manual, Publication 871FM-UM001
Provides information to mount and install 871FM
extended range sensors.
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
Provides general guidelines for installing a
Rockwell Automation® industrial system.
Product Certifications website, http://
www.rockwellautomation.com/global/certification/
overview.page
Provides declarations of conformity, certificates, and
other certification details.

8Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Preface
Notes:

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 9
Chapter 1
Product Overview
Product Description The Bulletin 871FM miniature metal flat pack inductive sensors are the result
of a unique collection of enhancements—electrical and mechanical—that
make these sensors the optimal solution for harsh duty applications. The
machined stainless steel housing combines an unusually thick sensing face with
one-piece construction. The result is a sensor that is exceptionally resistant to
abrasion and impervious to fluid ingress, a feature especially crucial in
applications that involve cutting fluids and chemical washdowns. The 871FM
sensors stainless steel housing with metal face provides a more rugged solution
in harsh environments.
The IO-Link interface enables consistent communication for diagnosing and
parameterizing through to the sensor level and makes the intelligence that is
already integrated in every 871FM inductive sensor fully available. These
features provide particular advantages in the service area (fault elimination,
maintenance, and device replacement), during commissioning (identification
and configuration), and during operation (continuous parameter monitoring
and online diagnosis). The 871FM sensor operates as a standard discrete sensor
on pin four (black) or communicates via IO-Link on the same pin when
connected to an IO-Link master.
Operating Modes The sensor can operate in two modes:
•Standard I/O (SIO) Mode: The sensor default operation mode. The
sensor and its output act as a standard inductive sensor without IO-Link
functionality. This mode of operation is active when the sensor is
connected to a digital input device such as a PLC input module, a
distribution box, or an input terminal connection.
•IO-Link Mode: This mode is automatically activated when the sensor is
connected to an IO-Link enabled master device. Upon entering this
mode, the yellow status indicator on the sensor stays solid to indicate
that IO-Link communication has successfully been established with the
master. The sensor transmits parameter and diagnostic information that
can be accessed via PLC process data. No user intervention is required to
enable this functionality within the sensor.

10 Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Chapter 1 Product Overview
Features • 10…30V DC operating voltage
• Stainless steel housing
• Equal sensing for both steel and aluminum
• IP67/IP69K rated
• 3- or 4-wire operation
• IO-Link communication protocol helps minimize downtime and
increase productivity
• IO-Link sensors are forward/backward compatible with standard
sensors: the same sensors and same cables that are used in IO-Link and
non-IO-Link applications
•IO-Link provides
– Remote detection of the health of the sensor
– Margin status (low alarm)
–Timer function
Specifications Attribute General-purpose Weld Field Immune
Load Current ≤ 100 mA; Auto detect (PNP/NPN) at power-up
Leakage Current ≤ 10 µA
Operator Voltage 10…30V
Voltage Drop ≤1.8V
Switching Frequency ≤200 Hz ≤50 Hz
Power-On Delay (Time delay before
availability)
<80 ms
No-Load Supply Current ≤10 mA
Repeatability ≤5%
Hysteresis 5% typical
Protection Type False pulse on power, transient noise, reverse polarity, short circuit, and overload
Certifications c-UL-us Listed and CE Marked for all applicable directives
Enclosure Type Rating IP69K IP67
Housing Material Stainless Steel 303 with Stainless Steel face
Factor-1 equal sensing Yes
Connections 203.2 mm (8 in.) pigtail with 4-pin Micro QD
Operating Temperature -25…+70 °C (-13…+158 °F)
Storage Temperature -40…+70 °C (-40…+158 °F)
Operating Humidity 5…95% relative (noncondensing)
Shock 30 g (1.06 oz) with 11 ms pulse duration
Vibration 55 Hz, 1 mm amplitude
IO-Link
Protocol IO-Link V1.1
Interface Type IO-Link
Mode COM 2 (38.4 kBd)
Cycle Time 10.4 ms, minimum
SIO (standard I/O) Supported (pin 4 for either IO-Link or SIO)

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 11
Product Overview Chapter 1
Mounting Dimensions are shown in mm (in.).
20 (W) x 32 (L) x 8 (H) mm
[0.94 (W) x 1.25 (L) x 0.31 (H) in.]
ABCDE
7 mm Sensing 24 (0.94) 35 (1.38) 20 (0.79) 20 (0.79) 48 (1.89)
30 (W) x 52 (L) x 14 (H) mm
[1.18 (W) x 2.04 (L) x 0.55 (H) in.]
10 mm Sensing 45 (1.77) 45 (0.79) 30 (1.18) 30 (1.18) 90 (3.54)

12 Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Chapter 1 Product Overview
Notes:

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 13
Chapter 2
Installation
Status Indication User
Interface
Table 2 - Standard I/O Operation
Table 3 - IO-Link Operation
Mounting Securely mount the sensor on a firm, stable surface or support for more reliable
operation. Mounting that is subject to excessive vibration or shifting could
cause intermittent operation. Once securely mounted, the sensor can be wired
per the wiring instructions in the next section.
The location of the target in relation to the sensor face can require you to
adjust the sensor mounting. The 871FM sensor offers margin indication
through the orange status indicator. The status indicator blinks when the
target is 80% of the maximum sensing distance or farther from the sensor face.
We recommend adjusting the sensor to be closer to the target.
Green Indicator (Power) Orange Indicator (Output) Condition
Off Off Power Off
Off Flash at 2 Hz Passed on point (margin zone)
On Off Powered On/No Target
Flash at 2.0 Hz Off Short Circuit, Fault
Green Indicator (Power) Orange Indicator (Output) Condition
On Off No target or target far away
Off On Target present
Flash at 2.0 Hz Flash at 2.0 Hz; reverse from green
status indicator
Location indication mode
IMPORTANT When the sensor is connected to IO-Link, the status indicators do not
indicate margin status. The margin status is shown as a process bit in the
Studio 5000® controller tag.

14 Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Chapter 2 Installation
Dimensions Dimensions are shown in mm (in.).
Wiring
20 (0.79) R2.5
14 (0.55)
32
(1.26)
21.75
(0.86)
3
(0.12)
2x n3.3
13 (0.51)
50
(1.97)
M12x1 Thread
Status
Indicator
3
(0.12)
L
8 (0.31)
3
(0.12)
M12x1 Thread
50
(1.97)
L20 (0.79)
2x n4.5
Status
Indicator
36.75
(1.45)
52
(2.05)
R2.5
30 (1.18)
5
(0.2)
1: BRN +
2: WH NC (DO)
4: BLK NO (C/Q)
3: BLU -
PNP (Sourcing)
NPN (Sinking) 1
2
4
3
L +
L -

Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 15
Chapter 3
871FM Miniature Metal Flat Pack with
IO-LinkOverview
What Is IO-Link? IO-Link technology is an open point-to-point communication standard and
was launched as (IS) IEC 61131-9. IO-Link is now the first globally
standardized technology for sensor and actuator communication with a field
bus system. This technology provides benefits to both OEMs and end users.
IO-Link provides communications-capable sensors to the control level by a
cost-effective point-to-point connection. IO-Link provides a point-to-point
link between the I/O module and sensor that is used for transferring detailed
diagnostics, device identity information, process data, and parameterization.
IO-Link communication is based on a master-slave structure in which the
master controls the interface access to the sensor. The option of using the
intelligence that is integrated into the sensor provides you with new methods
to commission the device. Benefits of IO-Link technology range from reduced
installation time during startup to increased diagnostics over the lifetime of the
machine. Other benefits of IO-Link technology include:
• Reduced inventory and operating costs
• Increased uptime/productivity
• Simplified design, installation, configuration, and maintenance
• Enhanced flexibility and scalability
• Detailed diagnostic information for preventive maintenance
Why IO-Link? IO-Link offers a full range of advanced features and functions.
Seamless Integration
• Forward and backward compatible, sensor catalog numbers remain the
same
• No special cables required
• Connectivity options remain the same
• Access IO-Link functionality by simply connecting an IO-Link enabled
device to an IO-Link master

16 Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017
Chapter 3 871FM Miniature Metal Flat Pack with IO-LinkOverview
Real-time Diagnostics and Trending
• Real-time monitoring of the entire machine down to the sensor level
• Optimized preventive maintenance—identify and correct issues before
failures can occur
• Detect sensor malfunctions/failure
Sensor Health Status
• Real-time monitoring verifies that sensors are operating correctly
Device Profiles and Automatic Device Configuration
• “Golden” device configurations are stored in the IO-Link master
module
• Within minutes instead of hours, modify sensor parameters to produce
different finished goods
Descriptive Tags
• Faster programming during initial setup
• More efficient troubleshooting-process data tags are named based on the
information they provide
• Easily monitor sensor data though intuitive tag names
How Does IO-Link Work? IO-Link delivers additional operational data and diagnostics using the same
standard field cabling that is used today. By connecting an IO-Link sensor to an
IO-Link master, the field-device data and diagnostics are accessible. This
connection allows you to go beyond detecting products on the machine. You
can now monitor the health of the machine as it runs.
Pin Signal Remark
1L+
24V
2Out
Depends on sensor
3L-
Ground
4C/Q
Communication/
switching signal
IMPORTANT The response time of an IO-Link system could be fast enough for high-speed
applications. In this case, it is possible to monitor/configure the sensor
through IO-Link on pin 4 while pin 2 is connected to a standard input card.

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Transmission Rates
Three baud rates are specified for the IO-Link device:
• COM 1 = 4.8 kBd
• COM 2 = 38.4 kBd
• COM 3 = 230.4 kBd
An IO-Link device typically supports only one of the specified transmissions
rates, while the IO-Link V1.1 specifications requires an IO-Link master to
support all three baud rates. (See Product Specifications for product baud
rate.)
Transmission Quality
The IO-Link communication system operates at a 24V level. If a transmission
fails, the frame is repeated two more times. If the transmission fails on the
second try, the IO-Link master recognizes a communication failure and signals
it to the controller.
Response Time of the IO-Link System
The device description file (IODD) of the device contains a value for the
minimum cycle time of the device. This value indicates the time intervals at
which the master can address the device. The value has a large influence on the
response time. In addition, the master has an internal processing time that is
included in the calculation of the system response time.
Devices with different minimum cycle times can be configured on one master.
The response time differs for these devices. When configuring the master, you
can specify a fixed cycle time and the device-specific minimum cycle time that
is stored in the IODD. The master then addresses the device that is based on
this specification. The typical response time for a device therefore results from
the effective cycle time of the device and the typical internal processing time of
the master. (See Specifications on page 10 for minimum product cycle time.)

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IO-Link Data Types There are four data types available through IO-Link:
Process Data
The process data of the devices are transmitted cyclically in a data frame in
which the device specifies the size of the process data. Depending on the
device, 0…32 bytes of process data are possible (for each input and output).
The consistency width of the transmission is not fixed and is thus dependent
on the master.
Some devices can support multiple process data modes, which allow you to
select different cyclic process data themes.
Value Status
The value status indicates whether the process data is valid or invalid. The
value status can be transmitted cyclically with the process data.
Device Data
Device data supports device-specific configurable parameters, identification
data, and diagnostic information. They are exchanged acyclically and at the
request of the IO-Link master. Device data can be written to the device (Write)
and also read from the device (Read).
Events
When an event occurs, the device signals the presence of the event to the
master. The master then reads out the event. Events can be error messages and
warnings/maintenance data. Error messages are transmitted from the device to
the controller via the IO-Link master. The transmission of device parameters
or events occurs independently from the cyclic transmission of process data
(see Error Codes and Events on page 77 for device-specific events and
associated codes).
Process data →Cyclic data
Value status →Cyclic data
Device data →Acyclic data
Events →Acyclic data

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Access IO-Link Data Cyclic Data
To exchange the cyclic process data between an IO-Link device and a
controller, the IO-Link data from the IO-Link master is placed on the address
ranges assigned beforehand. The user program on the controller accesses the
process values using these addresses and processes them. The cyclic data
exchange from the controller to the IO-Link device (that is, IO-Link sensor) is
performed in reverse.
Acyclic Data
Acyclic data, such as device parameters or events, are exchanged using a
specified index and subindex range. The controller accesses these using Explicit
Messaging. The use of the index and subindex ranges allows targeted access to
the device data (that is, for reassigning the device or master parameters during
operation).
Start-up the I/O System If the port of the master is set to IO-Link mode, the IO-Link master attempts
to communicate with the connected IO-Link device. To do so, the IO-Link
master sends a defined signal (wake up pulse) and waits for the IO-Link device
to reply.
The IO-Link master initially attempts to communicate at the highest defined
data transmission rate. If unsuccessful, the IO-Link master then attempts to
communicate at the next lower data transmission rate.
If the master receives a reply, the communication begins. Next, it exchanges the
communication parameters. If necessary, parameters that are saved in the
system are transmitted to the device. Then, the cyclic exchange of the process
data and value status begins.
Assign Device Parameters Configuration of a device for a specific application requires changes to
parameter settings. The device parameters and setting values are contained in
the IODD of the device.
I/O Device Description (IODD) files contain information about the device
identity, parameters, process data, diagnostic data, and communication
properties. These files are required to establish communication with the
sensors via IO-Link.
The IODD consists of multiple data files; the main file and several optional
language files are in XML-format and graphic files are in PNG format
(portable network graphics). These files adhere to the IO-Link open standard,
which means that they can be used with any IO-Link masters.
IODD files are assigned using Studio 5000® and the 1734-4IOL Add-on
Profile (when using the 1734-4IOL IO-Link master module).

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Premier Integration The Studio 5000 Logix Designer® environment combines design and
engineering elements in one interface, enables you to access I/O and
configuration data across the Integrated Architecture® system. Use of a
Rockwell Automation solution, provides a smooth, consistent integration of
Allen-Bradley® IO-Link enabled devices into the system.
To simplify the integration of the Allen-Bradley IO-Link devices to the
Rockwell Automation architecture, there is an IO-Link Add-on Profile (AOP)
available for the 1734-4IOL master module. The use of an AOP simplifies the
setup of devices by providing the necessary fields. This setup allows you to
build and configure their systems in a quick and efficient manner.