DV 13.3.1.  EIOC has Modbus TCP/IP driver installed.  When I HTTP to the MEB unit, I can see that the MEB is device 3 and there are connections to 2,11,14,19 & 43.  My Quantum configuration in Concept shows my PLC device ID to be 11.  I can't get a connection to the PLC via the EIOC with a holding register setup.  It says no device com.  This is our first EIOC, but I am very versed in VIM and serial modbus RTU/ASCII and modbus Ethernet IP connectivity in general. 

When I use the MEBII register viewer, I can see registers changing in the modbus table but they don't correlate to my ModbusPlus registers in the PLC.  I have devices 2,3(MEB),14,19 & 43 connected to the system and 2,14,19 & 43 are wonderware PC's (non modbusplus utilizing the MEBII for comm). I put in a GSC call and their response was no information available.  I have tried broad scope register setup and single point register setup for coils, inputs & holding registers and same "no communication" status in DV Diagnostics with a bad status.

In search of anyone who has made this connection successfully to provide some insight.  Thanks...JWB