Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 94)

Publication ENET-UM527E-EN-P - October 2006
94 Create Custom Web Pages
Read Controller Tags There are two ASP functions you can use to read controller tags:
Function: ReadLogixTag(path, tagname, tagtype)
The ReadLogixTag function connects to a controller at a specified
path , retrieves the value of a tag with a name tagname and of
tagtype .
Parameters:
Example: For example, retrieve a DINT tag named ’my_dint_tag’ from a
controller in slot 3 of the local chassis:
"my_dint_tag" value:
<% ReadLogixTag("1,3", "my_dint_tag", "DINT"); %>
Function: ReadLogixTagUnconnected(path, tagname, tagtype)
The ReadLogixTagUnconnected function performs the same task as
ReadLogixTag function and uses the same parameters. This function,
however, retrieves the tag value through unconnected messaging,
rather than connected messaging.
If You Want Use This ASP Function See Page
Connected messaging ReadLogixTag 94
Unconnected messaging ReadLogixTagUnconnected 94
Parameter Description
path The path is a CIP path, with no spaces, and segments separated by commas. For example:
tagname The tagname identifies a controller-scoped tag.
tagtype The tagtype must be an atomic type (BOOL, SINT, INT, DINT, REAL) or string. Use standard
dot notation to specify a member of an array or a user-defined structure (for example,
’timer1.ACC’ for the accumulator of a timer tag named ’timer1’).
Path Example Description
1,3 1 = backplane
3 = slot 3