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2.1.2 Data transmission
2.1.3 Transmission media
TECHNICAL BASICS
Basically 4 different types of data exist, which are transmitted either cyclically or acycli-
cally.
–
Process data o cyclic data exchange
– Value status o cyclic data exchange
– Device data o acyclic data exchange
– Events o acyclic data exchange
Process data:
The devices' process data are transmitted cyclically, whereas the process data size is defined
through the device. The device process data can contain from 0 to 32 Byte (for both in- and out-
put).
Value status:
The value status displays if process data are valid or not. It is transmitted cyclically with the process
data.
Device data:
Device data are parameters, identification data and diagnostic information. The transmission is
done acyclically and only on demand of the IO-Link master.
Events:
Events are error messages or warnings/maintenance data. Error messages are transmitted from
the device to the PLC or similar via the IO-Link master. The IO-Link master itself can also transmit
events and status information. Those events can be for example an open circuit, communication
loss or an overload.
TECHNICAL BASICS
IO-Link does not require any special wiring. The sensors and actuators can continue to be
connected using the proven, attractively priced and unshielded industrial cables.
The operating modes available for selection are the standard switch mode and the com-
munication mode.
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