...

• If elements are added or removed from a UDT structure, you should go through the L5X Import Tool to re-import the four tables into ACE (Scan Table, Poll Table, RTDB, TagNames, rather than modifying the tables by hand.
• Unsolicited RPI data via Implicit messaging (unsolicited data from device using RPI cycle time) via UDP is not supported.
• Only peer-to-peer, single-level communications are allowed. No tunneling is allowed through PLCs to other PLCs, networks, or protocols using the EtherNet/IP master driver.
• The EtherNet/IP Master is unable to identify "Local:1" physical I/O items. The PLC program must create tags or aliases for each I/O point required in the polling communication.

If an external Modbus host is reading PLC data from the RediGate using a Modbus Slave Channel, then there are special requirements for the organization of RTDB registers (see the "Modbus Slave Attach" section of the RediGate Configuration Manual). 

Using the L5X Tool

See the Ethernet/IP Master Quick Start documentation for instructions on using the Elecsys "L5X Import Tool." The steps are summarized here:

...