Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 107)

Publication ENET-UM527E-EN-P - October 2006
Create Custom Web Pages 107
This example also requires a custom access level.
This method (updating the data view) is geared toward programmatic
updates. When an external application that loads a data view wants to
change values in that data view, the application can post a modified
version of the data view to a special URL on the web server module:
1. Load the XML data view from its URL (for example,
“/user/Web/system/dataviews/myview.xml”).
2. Systematically modify the values of any tags.
3. Remove any tags that were not modified from the XML
document.
4. Either post the XML file as a file attachment or include its
contents in a parameter named ’xml’ posted to the URL of the
data view iteself.
5. Include a redirect parameter to direct a user to a page showing
an up-to-date copy of the data view being modified.
Consider:
• Only tags marked as ’Write’ or ’Administrator’ can be changed.
All changes to the values of ’Read’ tags are ignored.
• When the program posts an update to the data view, it must
present the same user authentication that was necessary to
initially load the data view.
• Any errors in the XML, whether ’valid’ (in XML) manipulations of
the original document or malformed XML content, return an
HTTP error to the client program.