System overview
1.10 Connection to the higher-level control
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
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1.10.2 IO-Link
IO-Link is a new communication standard for sensors and actuators - defined by the
PROFIBUS User Organization (PNO). The IO-Link technology is based on a point-to-point
connection of the sensors and actuators to the control. Therefore, this technology is not a
bus system, but an enhanced version of a classic point-to-point connection. In addition to the
cyclic operating data, comprehensive parameters and diagnostics data are transferred for
the connected sensors and actuators. The same 3-wire connecting cable as currently used
for standard sensors is used.
IO-Link is:
● An open and standardized system for transmitting device-specific data.
● An intelligent wiring system positioned between conventional wiring and fieldbus systems.
● A system which offers advantages in the control cabinet and is integrated in the TIA
concept.
IO-Link is thus an intelligent wiring system which is fully integrated in TIA.
1.10.2.1 Overview
Components of an IO-Link system
Only 2 components are required to use IO-Link:
● IO-Link master
● IO-Link device (e.g. IO-Link sensor/switching device, IO-Link I/O module)
Compatibility of IO-Link
IO-Link guarantees compatibility between standard modules and those with IO-Link
capability as follows:
● IO-Link sensors/actuators can generally be operated on IO-Link modules (master) and on
standard I/O modules.
● Both IO-Link sensors/actuators and current standard sensors/actuators can be used on
IO-Link modules (master).
● If conventional components are used in the IO-Link system, naturally only the standard
functions are available in this case.
Expansion by means of IO-Link I/O modules
The compatibility of IO-Link means that you can connect standard (conventional)
sensors/actuators to it too. This can be implemented especially cost-effectively with IO-Link
I/O modules that permit the connection of several sensors/actuators to the controller via one
cable.
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