Rockwell Automation 1738 Assembly Connections for POINT I/O and ArmorPOINT I/O EtherNet/IP Adapters - Manual (Page 28)

Publication 1734-UM016A-EN-P - October 2010
22 Using an Assembly Connection
The error shown above was created by entering an invalid configuration
assembly size on the Module Properties page. A size of 18 bytes was entered.
The error here points to an offset of 0x000b (11 decimal). If we return to the
configuration tag, byte 0x000b is the location that contains the size of the I/O
module configuration. The header is 10 bytes and the module has 8 bytes of
configuration. However, we have neglected to add the 4 bytes of overhead
needed to describe the slot 2 configuration. When the adapter parsed the
configuration assembly to byte 0x000b it saw that it needed 8 more bytes of
information. It had already parsed through byte 11, therefore 18 would not be
an adequate size. The adapter returns the offset of the first byte where the
error is detected (0x000b).