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i work as an instrumentation an control engineer in an metalurgical complex in mexico, an Electrolitical zinc plant. and right now we are using diferent control systems, some of them are PLC-5, Contrologix, several SLC, all of them from allen bradley. we also have flex i/o via ethernet, and devicenet systems. but now here they want to change all that to a deltav system using FFieldbus instruments. i'm not really sure about that, i think is more expensive, less friendly, the OPC with the plc don't work very well, and the FF instuments are more complicated than regular 4-20 instruments. these PLC have worked very well. i am not telling that the deltav sucks, i know is a very good DCS but i would really like to know the bad things about this system (deltav) and if it's better the processlogix than this one. thanks.