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Rockwell Automation Publication 871FM-UM002A-EN-P - April 2017 79
Appendix
D
Explicit Messaging Examples
Although the parameters are configured within the Add-on Profile (AOP), it is
possible to read and write parameters via Explicit Messaging. Use the device
index table to establish the index number and its properties.
Table 6 details of Service Codes that are used in Explicit Messaging, these
codes along with the Index and Subindex numbers are used in the
configuration of the MSG instruction.
This appendix also gives index read/write examples ( page 80 and page 81 ) and
sub index read/write examples ( page 82 and page 83 ).
Service Codes
Table 6 - Service Codes
Service Code Hex
(Dec)
Need in Implementation
Service Name Description Class Instance
4b (75) Required Required Read Subindex Read a parameter value from the IO-Link device
4c (76) — Required Write Subindex Write a parameter value from the IO-Link device
4e (78) Required Required Read Index Read an entire index (all parameters within an index) from the IO-Link
device
4d (77) — Required Write Index Writes an entire index (all parameters within an index) from the IO-Link
device
Table 7 - Ladder Logic Rules
(1)
Instruction Message Configuration
Array[0] Array[1] Source Length [bytes] Service Code Attribute ID
Write
4IOL Channel# value 4IOL index value 1 4e 0
8IOL Channel# value 8IOL index value 1 4e 0
Instruction Message Configuration
Array[0] Array[1] Source Length [bytes] Service Code Attribute ID
Read
4IOL Channel# 4IOL 1 4d 0
8IOL Channel# 8IOL 1 4d 0
(1) For more information about Service Codes, see Appendix A.