The EWEB is not the most popular Controllogix module but it is probably has the most unrealized potential of the Controllogix platform and is by far my favorite. It is also capable of communicating directly with VB or any other software that can issue a HTTP request (no RsLinx needed) and transfer 2500 tags at a time in the form of an XML file which is easy to parse in VB. It will take care of your socket connections and you get a great Web Server for free. As long as threre is not any actual Ethernet I/O I would say definately go with the EWEB of the information given so far. There are other differences but don't have anything in front of me to look at. The big communications that the EWEB is missing is class 1 messaging (you can't put Ethernet modules below it in the I/O tree of RsLogix 5000). If it goes through RsLinx, is RsView or something like that then the EWEB can do it. The EWEB may be able to communicate with the supervisory system depending on the setup.
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