Table 20: Structure of a read ISDU request:
Name Value Type Description
CIP Service 75 (0x4B) - ISDU read service
CIP Class 131 (0x83) - IO-Link Device Parameter Object
CIP Instance 1…8 -
Addressing the corresponding IO-Link port to
which the IO-Link device is connected
CIP Data Index UINT IO-Link ISDU object index
Subindex USINT IO-Link ISDU object subindex
The structure of a read ISDU response:
Positive response (CIP Status in service response corresponds to 0)
Table 21: Structure of a read ISDU response – positive response
Name Value Type Description
CIP Data ISDU data BYTE ARRAY Received IO-Link object data of the connected IO-
Link device Maximum number of bytes: 0-232
Negative response (CIP Status in service response does not correspond to 0)
Table 22: Structure of a read ISDU response – negative response
Name Value Type Description
CIP Data CIP/Error
code
UINT IO-Link Master Error
USINT IO-Link Device Error
USINT IO-Link Device Additional Error
Writing an IO-Link device index
A specific index of a connected IO-Link device can be written using the Write_ISDU 76
service (0x4C). The corresponding IO-Link port is addressed via the corresponding CIP
instance number. Attributes do not have to be addressed. The service data contains the
index and subindex of the corresponding IO-Link device parameter.
The structure of a write ISDU request:
Table 23: Structure of a write ISDU request:
Name Value Type Description
CIP Service 76 (0x4C) - ISDU write service
CIP Class 131 (0x83) - IO-Link Device Parameter Object
CIP Instance 1…8 -
Addressing the corresponding IO-Link port to which
the IO-Link device is connected
CIP Data Index UINT IO-Link ISDU object index
Subindex USINT IO-Link ISDU object subindex
Data BYTE ARRAY Data to be written to the corresponding IO-Link
device. Maximum number of bytes: 0-232
The structure of a write ISDU response:
Positive response (CIP Status in service response corresponds to 0)
Table 24: Structure of a write ISDU response – positive response
Name
Value Type Description
CIP Data The positive response to this CIP service contains no data (BYTES = 0)
Negative response (CIP Status in service response does not correspond to 0)
OPERATION
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8027834./2022-06-10 | SICK O P E R A T I N G I N S T R U C T I O N S | Sensor Integration Gateway - SIG350
41
Subject to change without notice
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