Controllogix <-> Siemens S7 Ethernet Comms

I am looking to read 10 words and write 2 words of data from a 1756 Controllogix to an Siemens S7 for a SCADA application. I would like to do this with-out using "3rd Party" hardware (i.e Prosoft Modules, etc). I have been told it can be done with minimal configuration using a 1756 EWEB module but I do not have any sample code to "translate" the address formats.

Thanks