IO-Link is a point-to-point communication protocol that connects field devices like sensors and actuators to controllers and other control systems. It uses a standard 3-wire cable and supports transmission speeds up to 230kbps. IO-Link devices connect to an IO-Link master, which acts as an interface between the device and higher-level networks. This allows for extensive device diagnostics and parameterization of devices from the controller without needing additional hardware or on-device interfaces. IO-Link simplifies wiring and configuration of distributed automation systems.

1. Adrian Sorsby
Balluff Limited
IO-Link Technology

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what is IO-link?

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not another bus system!
point to point communications protocol from the
fieldbus to the sensor and actuator level.
upto20M
Pulse-width modulated 24V
Baud rates: 4.8 kBit/s (COM1), 38.4 kBit/s (COM2), 230,4 kBits/s (COM3)
Pin Signal Description
1 L + 24 Volt
2
3 L - 0 Volt
4 C / Q
IO-Link
communication
+ switching signal

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an open standard
standard - IEC 61131-9
network neutral

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IO-Link devices
many different IO-Link devices are available.

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IO-Link system basic components:
IO-Link master
… acts as a gateway between the IO-Link device and the higher level communication
system, such as a fieldbus (Profinet, EtherNet/IP, etc.) or a device-specific backplane bus.
IO-Link device
… is the field device with communication capability: sensors, switching
devices, valve terminals, RFID devices, indicator lights, etc.
3-core unshielded standard cable – up to 20M long
… is the standard interface between IO-Link master and device
IODD and engineering tool
… are used to configure and assign parameters to the IO-Link system and devices.

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IO-Link masters
panel
mounted unit
with terminals
IP67 field I/O
module
additional slice on existing PLC

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why IO-Link?

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low cost per I/O point – 496 I/O on one IP address
low cost
high density
less addresses

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simplify valve manifold wiring
reduced installation time
reduced cost

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easier handling of measurement devices
lower cost – no analogue card
lower cost vs IE networked device
less wiring effort
traditionally
better
best

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extensive diagnostics
available on sensors/devices and
sensor hubs
troubleshoot problems quickly
maximise up-time

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extensive diagnostics
Short circuit – LED for each I/O port
Short circuit does not impair the unit
Sensor/actuator under voltage LED for each I/O port

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IO-Link safety

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HMI
parameterisation – std pressure sensor
HMI
HMIHMIHMI
HMI

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parameterisation – std pressure sensor
Time consuming configuration of 10 – 15 Parameter.
(e.g. upper/lower Pressure point, Hysteresis, Time – or
Pressure window)
Machine Tools have often more than 10 Pressure sensors
Error prone due to manual entry
Very bad when Sensor failure / Sensor exchange
(especially during night shift)
Manual
configuration

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parameterisation – std pressure sensor
HMI
HMI
HMI
HMI

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HMI integrated in sensor for set up
means additional cost.
Expensive high-pressure hydraulic
hoses
parameterisation – std pressure sensor
machine tool
Additional cost for protective
housing for sensors in the machine

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parameterisation – pressure sensor with IO-Link
E.g. machine tool

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PLC
Function-
blocks
Vendor_ID
Device_ID
Param1: 50bar
Param2: 100bar
Param3: 200ms
Step 1
Identify device
Step 3
Get Parameter Set
Step 2
Check identity
Step 4
Write Parameter
Set
parameterisation – pressure sensor with IO-Link

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parameterisation – pressure sensor with IO-Link
sensor installed at point of measurement
no expensive measurement cables - use std
un-shielded 3-wire standard cables
no protection case
no sensors with HMI but reliable
parameterisation via controller and HMI of
the machine
decentralised diagnostics for sensors

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parameter server
IO-Link V1.1 master

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automated tool changes
IO-Link inductive couplers for non-contact
signal transmission

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an i4.0 enabler
ERP
MES
SCADA
PLC
Network
Sensors and Actuators
Enterprise Level
Control Level
Management Level
Plant Control Level
Field Level
Sensor / Actuator Level

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unabated IO-Link success!

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how IO-Link?

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connect the master to the PLC and install the GSDML
file
drag and drop the relevant file and make the
PROFINET connection from the PLC to the master in
TIA Portal
IO-Link master configuration

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IO-Link master configuration
Drag the appropriate (process
data length) IOL input / output
byte from the catalogue and
name & address the module

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device configuration from PLC or using parameter
server
1. controller parameter storage – parameterisation
from the PLC using the function block
2. IO-Link master ver 1.1 parameter server

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device configuration with USB master or
webserver
3. PC storage with USB master
4. webserver entry with IO-Link master

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device configuration with Device Manager

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device configuration with integrated web server

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device configuration with integrated web server

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device configuration - manual
Manual
configuration
5. Manual configuration

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Conclusion

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THANKS FOR LISTENING!
Adrian Sorsby
Sales Manager
01606 812 777
adrian.sorsby@balluff.co.uk