Multiple Assembly Instances
The Assembly Mapping Object has two arrays on class level (Write PD Instance List and Read PD Instance List) listing instances defined by the application. The arrays of attributes 7 and 8 in the EtherNet/IP host object (Producing Instance Number and Consuming Instance number) are bound to the instance lists in the Assembly Mapping Object. The arrays list the corresponding CIP instance numbers representing each assembly instance defined by the application.
For more information, see
Anybus CompactCom 40 Software Design Guide, “Assembly Mapping Object (EBh)”