System overview
2.5 Device profiles
IO-Link system
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Function Manual, 12/2017, A5E31637677-AB
Startup of the IO system
If the port of the master is set to IO-Link mode, the IO-Link master attempts to communicate
with the connected IO-Link device. For this purpose the IO-Link master sends a defined
signal and waits for the reply of the IO-Link device.
The IO-Link master first attempts a communication with the highest defined data
transmission rate. If this transmission attempt fails the IO-Link master attempts a
communication with the lowest data transmission rate. The device always supports only one
defined data transmission rate.
If the master receives a reply, communication starts. First they exchange communication
parameters. If necessary the parameters stored in the system are transferred to the device.
Then the cyclic data exchange of process data and value status starts.
2.5
Device profiles
Introduction
Device profiles are defined for IO-Link to standardize access of the CPU user program to the
devices.
Data structure, data contents and basic functionality are defined in the device profiles. A
standard user view and an identical program access is thus achieved for a number of
different devices that have the same device profile.
IO-Link profiles
The device profile "Smart Sensor Profile" is currently defined for IO-Link. This profile is
especially suited for measurement sensors. In other words, measured values are transmitted
in addition to switching points.
In addition, the switchgear (for example, contactors) support the LVSG (Low Voltage
Switchgear) profile defined in IEC 61915-2.
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