Function description
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36
5.4
The principle of the data storage mechanism
5.4.1
General
Data storage enables a user to change an IO-Link device when maintenance is required without any
configuration or parameterization.
The IO-Link master, as well as the IO-link device, store the device parameters. The data storage
mechanism serves for synchronizing these different data storage buffers.
In case of a device change, the master writes the stored device parameters to the new device. The
application can be re-started without any further intervention using a configuration tool or similar.
In the BL20/BL67 IO-Link masters, the data storage mode can be set using the parameter "data stor-
age mode" (see
Parameters (Seite 20)
).
Data storage mode
00 = activated (s.
S. 37
)
01 = overwrite (s.
S. 38
)
10 = read in (s.
S. 39
)
11 = deactivated, clear (s.
S. 39
)
A change of parameters in the device is indicated by the status of the DS_UPLOAD_FLAG bit:
DS_UPLOAD_FLAG:
0 = no changes in the device's parameter set
1 = changes in the device's parameter set (e. g. via DTM, at the device, etc.)
Para. IOLD = parameter data of the IO-Link device
Fig. 4: General principle of the data storage mechanism
IO-Link-Master
(IOLM)
IO-Link-Device
(IOLD)
DS_UPLOAD_FLAG
Summary of Contents for BL20-E-4IOL
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