i have been asked to look at using RSView with a Siemens S7400 PLC by our client. I have some reservations about using a system that lends its self to a particular PLC (AB). Most people making comments on RSView (Other than the Sales Rep) have only engineered RSView with AB. Now I understand that one can use RSlinx OPC as an interface for most PLC's but has anyone used RSView with Siemens S7400 and if so how did they find it.