Commissioning and configuration
EPP6228-0022
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Version: 1.3
6.6.4
Parameter data exchange
An intelligent IO-Link sensor/actuator can support parameterization by ISDUs (Indexed Service Data Unit).
The PLC must explicitly query or, when marked as such, send these acyclic service data.
ISDU access
TwinCAT supports access via ADS and via the CoE directory.
The respective parameter is addressed via the so-called ISDU index. The following ranges are available:
Designation
Index range
System
0x00..0x0F
Identification
0x10..0x1F
Diagnostic
0x20..0x2F
Communication
0x30..0x3F
Preferred Index
0x40..0xFE
Extended Index
0x0100..0x3FFF
The range 0x4000 to 0xFFFF is reserved
The use and implementation of these ranges is the responsibility of the sensor/actuator manufacturer. For
clarification, just a few of the possible indices are listed here. Please take a look at the relevant chapter
“Object description and parameterization”.
Index
Name
0010
Vendor Name
0011
Vendor Text
0012
Product Name
0013
Product ID
0015
Serial Number
0016
Hardware Revision
0017
Firmware Revision
...
...
IO-Link operating modes
The IO-Link ports on the IO-Link master can be operated in the following nine modes (see Object description
and parameterization - IO-Link State, Index 0xA0n0:01):
• INACTIVE: Statemachine is inaktive
• DIGINPUT: The port behaves like a digital input
• DIGOUTPUT: The port behaves like a digital output
• ESTABLISHCOMM: The IO-Link wakeup sequence is running
• INITMASTER: Readout the IO-Link device and check the communication parameters
• INITDEVICE: Initialization of the IO-Link device
• PREOPERATE: Parameter server is running
• OPERATE: The port is used for IO-Link communication
• STOP: Communication is stopped (COM-stop)
