Download and trial the S7 GET & S7 PUR AOI's to communicate with Siemens S7 PLC's. A 24 hour demonstration mode is supported by the Sigma AOI's. The demonstration mode can be restarted when it expires by restarting the Rockwell CPU.
Develop your communication strategy and fully test in the demonstration mode. Purchase your runtime licence when you are satisfied with the solution.
This is a software solution which utilises the existing Ethernet capabilities of the Siemens PLC system you wish to connect. No hardware gateway is required.
The Manual and instruction videos provide the guidance to easy connect a Rockwell PLC with a Communications Processor to a Siemens S7 PLC using Ethernet.