¿Qué es IO-Link?

IO-Link (IEC61131-9) es un protocolo de comunicación serie estándar abierto que permite el intercambio bidireccional de datos de sensores y dispositivos que soportan IO-Link y están conectados a un maestro. El maestro IO-Link puede transmitir estos datos a través de varias redes, buses de campo o buses de fondo, haciendo que los datos sean accesibles para una acción inmediata o un análisis a largo plazo a través de un sistema de información industrial (PLC, HMI, etc.). Cada sensor IO-Link tiene un archivo IODD (IO Device Description) que describe el dispositivo y sus capacidades IO-Link.

Debe tenerse en cuenta que IO-Link no es bus de campo—sino más bien un protocolo de comunicación punto a punto entre un sistema IO compatible y un dispositivo de campo. Debido a que IO-Link es un estándar abierto, los dispositivos pueden integrarse en prácticamente
cualquier bus de campo o sistema de automatización.


• IO-Link community (independent)
• Hosted by PROFIBUS & PROFINET International
• 145 member companies (March 2017)
• Installed bases grows rapidly, especially in Factory Automation
• 5.3 Mio IO-Link nodes sold in 2016(masters and devices)


IO-Link facts

Digital communication
• Standardized communication technology (IEC 61131-9)
• Digital point-to-point UART protocol for cost-effective sensors and actuators
• Sensors are plugged into an IO-Link master
• IO-Link masters communicate PROFINET, EtherNet/IP and many other protocols to upper levels



Defend market share and attract new customers


Main arguments to convince your customers with IO-Link

Digitalization of basic devices is achieved with IO-Link.Those devices are now digitally accessible!

• Enabling device configuration – reduction of stock
• Easy configuration with apps
• Offline parameterization through the engineering environment of the automation system
• Easy device replacement by automatic device parameterization (IO-Link V1.1)
• Standardized access to diagnostic information
• Wide choice of IO-Link masters enables independence from automation system

Note: HART is uncommon in the proposed IO-Link applications and for those customer types and industries.

IO-Link benefits – Overview IO-Link V1.1 by the IO-Link community

Reduce costs and complexity
• Configurable devices reduce variety of required types
Enable smart machine concepts
• Continuous communication with each device to reach full potential
• Expanded possibilities for developing more innovative machinery and systems
Shorten commissioning time
• Standard unshielded cables and uses industry-standard connection plugs
• Offline engineering
Increase productivity
• Automatic device identification and multivariable devices
Speed up MRO
• Self-diagnosis and self-parameterization enable new repair and maintenance concepts

The digitalization of our basic devices is achieved with IO-Link.


IO-Link benefits – Unified Diagnostics

• Support of IO-Link Events: Standard Alarm, Warning and Notification
• NE107 Device Diagnostics : All E+H IO-Link devices support the “Device status” parameter
• Consistency with all other digital protocols (according to Standard 150)


• Example Flow: Empty pipe = IO-Link Warning = Out-of-Specification
• Example Pressure: Overpressure = IO-Link Error = Failure

Compatibility for device replacement

  • In the IO-Link system (acc. to V. 1.1) replacement of compatible devices without any changes to the machine is possible. All E+H IO-Link devices are V 1.1 compliant!
  • A device manufacturer can design a successor device or another device from the devicefamily in a compatible way. If there is a failure in the system, the operator can install acompatible device in the system without using any software tools.
  • The IO-Link master checks the configuration and discovers an error. Then it is checked if thedevice can be operated in a compatible mode. If this check is successful, the system isoperated in the same way as with the predecessor device.
  • The controller configuration, user program and IODD remain the same.
  • The manufacturers of IO-Link devices indicate what device types are compatible to otherdevices.

Target Industries

5 6

Target application example in F&B

General properties of a skid
• Typically less than 50 field devices per skid: Flow, On/Off (point level, pressure), compact thermometers and pressure transducers, valves, VFDs, pumps.
• Small foot print, no ex, local control/HMI
• PLC ecosystem conditioning Industrial Ethernet technology choice
• IO-Link is PLC independent and complementary


IO-Link testimonial and potential customers

• Willing to buy IO-Link for certain applications:

“Depending on customer demand, our machines are equipped with Siemens or Rockwell Automation controllers.
With IO-Link we now have a digital protocol which is independent of the automation system!”

IO-Link – Automation system view

IO-Link subsystem =
• IO-Link master (comparable to a Remote I/O)
• IO-Link devices (sensors or actuators)
• Standard 3-conductor sensor/actuator cable
• Not operational in hazardous area!

Identification of sensors is standardized (VendorID + DeviceID = unique identifier)Data
• 32 byte process data – cyclic
• Status bit – cyclic
• Device data (parameters, diagnostics) – acyclic
• Event data (error messages etc.) – acyclic


Tecnology Comparison


Protocol overview


Portafolio 2017


System Integration Testing

All E+H devices comply to the IO-Link Specifications and are successfully tested with a IOLink Device testing tool

Additional system integration tests are performed with:
• Rockwell Automation Studio 5000 and PointIO (1734-4IOL)
• Rockwell Automation Studio 5000 and Armor Block (1732E-8IOL-M12R)
• Turck IO-Link Master for PROFINET and EtherNet/IP (BL20-E-GW-EN with BL20-E-4IOL)
• Siemens TIA Portal and ET200SP (IO-L module)


Cerabar PMP23


Additional Values


Liquipoint FTW23


Additional Values


What is an IODD?

IO-Link devices can easily be connected to the IO-Link master via generic modules. To provide the user with easier use and more reliability the possibility was created to implement connection via the IODD file.

IO-Link device manufacturers need to deliver an IODD with every device, downloadable from IODDfinder or manufacturer homepage (www.endress.com/download).

It is a device description file, which describes the following

• Communication characteristics
• Device parameters with value range and default value
• Identification, process and diagnostic data
• Device details
• Text description
• Image of the device
• Manufacturer’s logo

Where to find the IO-Link Device Description (IODD)

• The Endress+Hauser website offers all device drivers and documentation
• The IODDfinder is a manufacturer independent central database for the IODDs


Device Configuration Management – Scenarios


Device configuration remotely at the Engineering station (Online or offline)


Device Configuration local with iO-Fly

• Available for all devices with IO-Link (also 3rd party)
• SAP Order No: Please contact sales@solutions.endress.com


Further information on IO-Link at www.io-link.com


Competitor overview


Competition Level


Competition Pressure


IFM IO-Link Portafolio Pressure