WAGO-I/O-SYSTEM 750
Appendix
89
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
11.1.2.1.1.2.1 Parameter Access via ISDU
ISDUs (Indexed Service Data Unit) are in the service units defined in the IO-Link
specification for identification of parameter data. Indexes/subindexes are specified
in the ISDU. Some indexes are already predefined by the IO-Link specification.
Other indexes such as "Vendor Name" are required and others are optional, e.g.
"Serial Number".
The IO-Link master codes write and read requests to an IO-Link-specific ISDU
and transfers them to the IO-Link device. In the IO-Link device, defined indexes
are used for parameter data access.
Figure 36: ISDU areas (see also IO-Link specification)
Predefined
parameters
Parameter Access via ISDU
Profile-specific parameter
0x30 …0x3F
Diagnostics
0x20 …0x2F
Identification
0x10 …0x1F
System
0x02 …0x0F
Device
parameters
(manufacturer-
specific or via
profile)
Profile-specific index
0x4000…0x4FFF
Extended index
0x0100…0x3FFF
Preferred index
0x40 …0xFE