V01.00 | 2019/10
13
Cyclical communication
Process data Value status (port qualifier)
n 0…32 bytes of process data possible per
device (each input and output)
n Process data size determined by the device
n The Port Qualifier indicates whether the
process data is valid or not.
Acylical communication
Device data Value status (port qualifier)
n Parameters, identification data or
diagnostic information
n Data exchange on request of the IO-Link
master
n Device data can be written to the device or
read from the device.
n Device indicates event to master: Error mes-
sages and warnings
n Master indicates event to device: e.g. cable
break or communication abort
Combining IO-Link devices with different specifications
Only devices of specification V1.0 can be operated on IO-Link masters of specification V1.0.
Devices of specification V1.0 and V1.1 can be operated on IO-Link masters of specification V1.1.
IO-Link device V1.0 IO-Link device V1.1
IO-Link master V1.0 x -
IO-Link master V1.1 x x
Data storage mode
NOTE
Data storage mode is only available for devices complying with the IO-Link specifica-
tion V1.1.
Data storage mode makes it possible to replace IO-Link devices without the need for a reconfig-
uration.
The IO-Link master or the IO-Link device save the device parameters set in the previous config-
uration. In data storage mode the parameter data memories of IO-Link master and IO-Link
device are synchronized. If data storage mode is activated in the IO-Link master, the master
writes the stored device parameters to the new device after a device is replaced. The applica-
tion can be restarted without having to perform a new configuration.
IO-Link-Master
(IOLM)
IO-Link-Device
(IOLD)
DS_UPLOAD_FLAG
Fig.3: Data storage mode – general principle, Para. IOLD = parameters of the IO-Link device
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