Profibus - Modbus TCP translator


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I am looking for a converter/translator that will convert Profibus to Modbus TCP. Specifically, I need to read data from several Siemens PLCs (which are networked together via Profibus), and all I have is a Modbus driver (it can read data via Modbus serial OR Modbus TCP - Ethernet). I assume this is some type of protocol converter. Also, I am NOT allowed to touch the existing Siemens PLCs; the converter has to stand alone (the Siemens PLC programs can NOT be touched). So, this device would poll the PLCs via Profibus and make the data available in a Modbus TCP server. Any ideas?