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3 IO-Link information
IO-Link is a serial digital communication protocol intended to be used in automation
technology. It connects sensors, actuators and also measuring systems (IO-Link
devices) to an automation system, e.g. a PLC. In a way, IO-Link provides for
digitalization of the “last meter” of the communication link to the sensors and
actuators.
IO-Link is defined in the international standard IEC 61131-9. Part 9 specifies IO-Link
under the term “Single-drop digital communication interface for small sensors and
actuators” (SDCI).
Where only binary states (on/off) or analog signals have been transmitted so far, it is
now possible to read status information from an IO-Link device and write
parameterization information to an IO-Link device. Now with this features, it is also
possible to connect measuring systems to an IO-Link system.
IO-Link is not just another bus system, but a point-to-point connection between the IO-
Link device and a link device, namely an IO-Link master.
The IO-Link master communicates with the IO-Link devices, collects data from them and
transmits the data to the higher-level bus system (Fieldbus) or to the Industrial Ethernet.
Figure 1: System overview [Source: IO-Link Community]
IO-Link Community
c/o PROFIBUS Nutzerorganisation e.V. (PNO),
Haid-und-Neu-Str. 7,
D-76131 Karlsruhe,
www.io-link.com/
Tel.: ++ 49 (0) 721 / 96 58 590
Fax: ++ 49 (0) 721 / 96 58 589
e-mail: mailto:info@io-link.com
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