You may wish to look at a device from Prolinx. The device is a gateway that allows data collected in one protocol to be accessed by a
different protocol. It is a hardware/software all in one small din rail mounted device. I am almost positive that it supports the iec
format that you require, and am certain that it supports the modbus tcp/ip protocol. The web site is www.prolinxgateways.com I work for a
distributor that sells their products, so just let me know if I can help.