SIOL-EI8B-USER-M
11
Description
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Version 1, May 2022
3.2.1. Data storage
NOTE
Data storage is only available for devices that comply with IO-Link version V1.1 and higher.
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Data storage offers the ability to replace IO-Link devices without reconfiguration.
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The IO-Link master or the IO-Link device saves the set device parameters of the previous
configuration.
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In data storage, the configuration of the IO-Link master and IO-Link device are synchronized.
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Following the replacement of a device, the master writes the saved device configuration to the new
device whenever data storage is enabled in the IO-Link master. The application can be restarted
without separately configuring the device.
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Following the replacement of an IO-Link master, the device writes the saved device parameters to
the new master whenever the “Save & Restore” data storage is enabled in the IO-Link master. The
application can be restarted without configuring the new master.
NOTE
Data storage can only be implemented using the EDS file. For example, to implement Backup & Restore
data storage for an IO-Link device on a given IO-Link port, the port must be setup as follows (see
Section 7.4.4 for IO-Link port parameter details):
➔
Parameter “IO-Link Port X_ - IO-Link Function Pin 4” must be configured as
“IO-Link Manual Configuration”.
➔
Parameter “IO-Link Port X_ - Validation&Backup” must be configured as
“Type compatible Device V1.1, Restore”.
➔
Parameter “IO-Link Port X_ - Vendor ID” must be configured to match the device.
➔
Parameter “IO-Link Port X_ - Device ID” must be configured to match the device.
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Ensure that the EDS configuration parameters are sent to the IO-Link master.
➔
Make desired configuration changes to the IO-Link device via acyclic ISDU writes.
(See Section 9.3 for details on acyclic device access.)
➔
Send a ParamDownloadStore command to the IO-Link device by writing a value of 5 to index 2.
This will set the DS_UPLOAD_FLAG in the device which triggers the master IO-Link port to backup
the current device configuration.
➔
If the current device is replaced with a type-compatible device (a device with Vendor and Device IDs
matching the port configuration), the IO-Link port will update the new device with the stored config
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uration from the previous device, as long as the DS_UPLOAD_FLAG is not set in the new device.
