Hi, which protocol would you prefer if you had to connect a Siemens S7 PLC with an I/A DCS? Profibus or Modbus? We use both at this time and it isn't a engineering problem. It's more that the S7 is new for us and we have the choice. Regards, Andreas Ineos Cologne _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave