IFM Electronic AL1122 - Page 98

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ifm Operating Instructions IO-Link Master with EtherNet/IP interface StandardLine 8 Ports IP 65 / IP 67 (AL1122) 2017-05-31
Appendix
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Read_ISDU
23118
With Read_ISDU, parameters of a connected IO-Link device can be read.
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Read Request
23702
Attribute determines the IO-Link port to which the IO-Link device is connected. The area "User
Specific Service Data" contains the IO-Link index and the IO-Link sub-index of the IO-Link object
whose value is to be read:
CIP format
Data type
MSG Config
IO-Link mapping
Class ID
UINT
0x80
IO-Link acyclic access
Instance ID
UINT
0x01
IO-Link master
Attributes
USINT
0x01...0x08
Port number
Service code ID
USINT
0x4B
Read Request (ISDU_Read)
User specific service data
UINT
Index
IO-Link ISDU object index
USINT
Subindex
IO-Link ISDU object sub-index
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Read response
23114
 Positive response
If the service has been executed successfully (Error Code = 0), the read data are returned bit by bit
(User Specific Service Data). The answer has the following format:
CIP format
Data type
MSG Config
IO-Link mapping
Class ID
UINT
0x80
IO-Link acyclic access
Instance ID
UINT
1
IO-Link master
Attributes
USINT
1...8
Port number
Service code ID
USINT
0x4C
Read response
Error code
USINT
0
--
Extended error code
USINT
0
--
User specific service data
USINT
e.g. 0xAB
Data (byte 0)
USINT
e.g. 0xCD
Data (byte 1)
...
...
USINT
e.g. 0xEF
Data (byte n)
The read data is in the IO-Link format. If necessary, the user needs to adapt the byte
arrangement of the read data to the CIP format.