IO-Link data memory
DSU100
11
8 Operation
The device supports different operating modes. An operating mode is set with the command value in
the process data output image.
Command value
Operating mode
0x00
Read
0x01
Auto-read data
0x02
Auto-write data
0x03
Read data
0x04
Write data
0x05
Delete data
All operating modes use the same status bits and error values in the process images.
8.1 Status bits
Process input
Bit
7
6
5
4
3
2
1
0
Name
Cmd End
Cmd Start
Acknowl-
edge
Process output
Bit
7
6
5
4
3
2
1
0
Name
Cmd Start
Status bit
Value
Description
Cmd End
0
Read/write operation not yet started or
active
1
Read/write operation terminated
Cmd Start Acknowledge
0
Start of a read/write operation not ac-
knowledged
1
Start of a read/write operation acknowl-
edged
Cmd Start
0
Reset trigger for read/write operation
1
Set trigger for read/write operation
w
The status bits “Cmd Start”, “Cmd Start Acknowledge” and “Cmd End” are not used in the
"Read UID" operating mode.
8.2 Error values in the process input
Error value
Name
Description
0x00
NOERROR
No error, read/write operation successful
0x01
UNKNOWN_COMMAND
Unknown command value
0x22
COMMAND SYNTAX
Command value is wrong, e.g. wrong
address or length indication.
