Rockwell-automation 1768-EWEB EtherNet/IP Web Server Module User Manua Manuale Utente Scaricare il pdf (Pagina 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:

<p> "my_dint_tag" value:

<% ReadLogixTag("1,3", "my_dint_tag", "DINT"); %>

</p>

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

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 169 170

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Rockwell-automation 1768-EWEB EtherNet/IP Web Server Module User Manua Manuale Utente Pagina 94