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Chapter 4
Common Features of IO-Link Device Integration
Data Storage
32
Configuration Tags
When you add an IO-Link device with ADC enabled, configuration tags are created based on the
configuration parameters that are available in the device IODD.
The benefit of having configuration tags is that the ladder program can use the configuration
tags to change the device configuration with programming logic.
The configuration tags can be used before or when the connection is open.
•
Before the connection is open, the ladder program inhibits the device, changes the
configuration tag, and uninhibits the device.
•
During an open connection, the ladder program changes the configuration tag and
issues a reconfiguration instruction.
Data Storage (DS) is a feature that is available from IO-Link Revision 1.1 onwards. When an
IO-Link device supports Data Storage, the Data Storage Backup/Restore function is used when
ADC is disabled. Data Storage Backup/Restore automatically backs up IO-Link device
configuration to the IO-Link master and automatically restores stored values to the device
during device replacement.
Device configuration is backed up to the IO-Link master module when one of the following
conditions is met:
•
There is no Data Storage copy for the device type on the port of the IO-Link master
module.
The Data Storage copy that is stored in the port of the IO-Link master module is cleared
in the following scenarios:
- The IO-Link master module is in the out-of-box state. All ports are cleared.
- The IO-Link master module is reset to factory default. All ports are cleared.
- An IO-Link master module channel mode is changed from "IO-Link", "Digital Input,
Fallback", or "Digital Input, Timestamp, Fallback" to any non IO-Link modes (for
example, "Digital Input" or "Digital Output") and the configuration is downloaded to
the module.
- When a connection to another IO-Link device type (different IO-Link Vendor ID,
IO-Link Device ID, or IO-Link Revision) is established on the port.
•
Device configuration has been updated and the DS_UPLOAD_FLAG is set in the IO-Link
device.
The DS_UPLOAD_FLAG is set in the IO-Link device when the ParamDownloadStore
command (IO-Link index 02, value 0x05) is sent to the device.
A successful device connection establishment, online application of device
configuration/reconfiguration, or reconfiguration instruction in the ladder
program automatically triggers Data Storage Backup as needed.
The Data Storage copy that is stored on a port of the IO-Link master module is restored to the
device attached to the port when the device type matches and one of the following conditions
is met.
•
An IO-Link device in the factory default state is connected to the IO-Link master
module.
•
The DS_UPLOAD_FLAG is not set in the IO-Link device.
The DS_UPLOAD_FLAG is stored in nonvolatile memory and is cleared in the IO-Link
device in one of the following scenarios.
- The flag is cleared automatically after a successful Data Storage Backup or Data
Storage Restore operation.
- The flag is cleared after resetting the device to factory default or out-of-box state.
Rockwell Automation Publication 5032-UM001A-EN-P - April 2023
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Troubleshooting
