Hello Archie ,
By reading Ethernet communication manual of FX3GE PLC (Pls google for jy997d45801d and download , refer page no 65 onwards),
and by referring various other posts on net , I could communicate with FX PLCs.
I can read 64 registers on each request , writing Registers is also OK.
If you want to make driver in Advanced HMI for Mitsubishi PLC on Ethernet I can send the code .
My Code is not as robust as AdvHMI drivers , since it only makes a connection , reads / writes data and disconnects , no diagnostics etc .
But it will be useful for developing on the lines of other drivers that you have written .
Regards,
Shriram Pendse
Pune , India.