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IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A Chapter 3. EtherNet/IP CIP Object Definitions - 43
ISDU Read/Write Object Definition (74 hex)
All PDO data is received and returned in the configured PDO format (8-bit, 16-bit or 32-bit). Refer to 3.3. PDO
(Process Data Output) Transfer Object Definition (73 hex) on Page 42 for a detailed explanation of the PDO
data block.
3.4. ISDU Read/Write Object Definition (74 hex)
The ISDU Read/Write object defines the attributes by which the PLC can:
• Send an ISDU request containing one or more read and/or write ISDU commands to an IO-Link device
via the IO-Link Master.
• Request the ISDU response(s) from the IO-Link Master.
• Send both blocking and non-blocking ISDU requests.
Refer to the ISDU Handling chapter for a detailed description of the ISDU functionality.
3.4.1. Class Attributes
The following table shows the Class Attributes for the ISDU Read/Write Object Definition (74 hex).
3.4.2. Instance Attributes
The following table shows the Instance Attributes for the ISDU Read/Write Object Definition (74 hex).
3.4.3. Common Services
The following table shows the Common Services for the ISDU Read/Write Object Definition (74 hex).
Attribute ID Name Data Type Data Value(s) Access Rule
1 Revision UINT 1 Get
2
Max Instance UINT 4 Get
3
Num Instances UINT
4
Note: Instance number determines IO-
Link port on the IO-Link Master.
Get
Attribute ID Name Data Type Data Value(s) Access Rule
1
ISDU Response ISDU response data block 0-255 Get
2
ISDU Read/Write Request ISDU request data block 0-255 Set
Service Code Implemented in Class Implemented in Instance Service Name
01 hex Yes No Get_Attributes_All
0E hex Yes Yes Get_Attribute_Single
10 hex No Yes Set_Attribute_Single
02 hex No No Set_Attribute_All