User Manual
Section 5
GFK-2958L
May 2021
Detailed Description of I/O Modules
292
The Data Storage function is enabled. Parameter data is exchanged between the IO-Link
master and IO-Link device if an inconsistency is detected. The direction of replacement
depends on the status of IO-Link master and IO-Link device. An upload of IO-Link device to
the IO-Link master takes place if a connected IO-Link device requests an upload (upload flag
set) or if there is no valid data in the IO-Link master. An IO-Link device requests an upload for
each change in the IO-Link device parameter.
If the parameter data saved in the IO-Link master does not match the data on the connected
IO-Link device and there have been no upload requests made by the IO-Link device, data is
downloaded from the IO-Link master to the IO-Link device.
IO-Link master status
IO-Link device
status
Action
No valid data
Upload flag set
Upload
No valid data
Upload flag not set
Upload
Valid data
Upload flag set
Upload
Valid data
Upload flag not set
Download
Clear
The Data Storage function is disabled. Parameter data already stored in the IO-Link master is
deleted.
Note
: If the Data Storage function is enabled, do not connect any IO-Link devices with
unknown parameters to avoid saving incorrect parameters. Reset IO-Link devices to
factory setting before you connect them.
“Channel diagnostics” parameter
The “Channel diagnostics” parameter activates channel diagnostics.
Disabled (default)
Channel diagnostics is disabled.
Enabled
Channel diagnostics is enabled.
“Process data length input” parameter
The “Process data length input” para
meter defines how many bytes the process input data of
the IO-Link master are occupied by the cyclic input data of the IO-Link device connected.
0 … 32 bytes
The cyclic input data of the IO-Link device connected occupies
0 … 32 bytes of the IO
-Link
master process input data.
auto (default)
The length of the cyclic input data is automatically set to the IO-Link device connected.
“Process data length output” parameter
The “Process data length output”
parameter defines how many bytes of the IO-Link master
process output data are occupied by the cyclic data of the IO-Link device connected.
0 … 32 bytes