HTML data access from 800xA
Your question really isn't easy to answer because there are several solutions depending on exactly what it is that you want to do ...
The problem is that 800xA is not a web page server. So there is no easy way to generate an HTML based display from 800xA. HTML Web Pages are not able to directly read data from an OPC server so you need some middleware layer that can make the data available to whatever Web page you are trying to generate. Typically, this means you are going to need a third party solution that can both read data from the OPC sever AND generate the web page that you need. There are several solutions that might do what you want, but I cant specifically recommend them - I can only say try these .....
- Put an AC500 PLC into the 800xA system and open a display using the built in Java web pages on the AC500.
- Use a Cogent Data Hub to connect to the 800xA OPC server -> https://cogentdatahub.com/connect/
- Inductive Automation's Ignition SCADA looks pretty promising > https://inductiveautomation.com/#
- An OPC to PHP interface -> http://www.opclabs.com/products/quick.... PHP is one of the easiest languages you can use to create Web pages. And this product will let you read OPC values and put them direct onto a web page. However, its only half of the solution - you need to be able to write PHP code !