Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 56)

Publication ENET-UM527E-EN-P - October 2006
56 Use Data Views to Access Controller Data
Tags Supported In Data Views
To configure tags in data views:
• You can only access tags in controllers that reside in the local
chassis (same chassis as the web server module).
• Tags must be controller-scoped.
• Tags must be an atomic type (BOOL, SINT, INT, DINT, REAL,
STRING).
You can specify a member of a structure or an array, but you
cannot specify an entire structure or array. BOOL arrays are not
supported.
• A tag can appear only once in a particular data view. You
cannot, for example, have two instances of the same tag with
different display formats.
• There is no limit to the number of data views as long as the total
number of entries in all data views on one web server module
does not exceed 2500 entries.
• Each tag you configure on a data view is one entry. If you
configure the same tag in multiple data views, each tag is
considered one entry.
Performance Estimates
For access to the XML data views, the module can produce data
according to the values listed in this table. This table assumes the
absence of significant CIP traffic and does not take into account the
amount of the time for the browser to render the data view page.
Tags Per Data View Time Per Data View
10 100 ms
100 350 ms
1000 3 sec