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he quotation marks. Note that you use the data block name and not a data block
number. Writing variables
User-defined pages can write data to the CPU. This is accomplished by using an AWP
command to identify a variable in the CPU to be writable from the HTML page. The variable
must be specified by PLC tag name or data block tag name. You can declare multiple
variable names in one statement. To write the data to the CPU, you use standard
POST commands.
A typical usage is to design a form in your HTML page with text input fields or select list
choices that correspond to writable CPU variables. As with all user-defiined pages, you then
generate the blocks from STEP 7 such that they are included in your STEP 7 program.
When an admin user subsequently accesses this page and types data into the input fields or
selects a choice from a select list, the server converts the input to the appropriate data
type for the variable, and writes the value to the variable in the CPU. Note that the name
clause for HTML input fields and HTML select lists uses syntax typical for the name clause of
the AWP_In_Variable command. Typically enclose the name in single quotation marks and if
you reference a data block, enclose the data block name in double quotation marks.
For form management details, refer to documentation for HTML. f no Use clause is provided, Varname1 is the variable to be written. It can be a
PLC tag name from your STEP 7 program or a tag from a specific data block.
If a Use clause is provided, Varname1 is an alternate name for the variable
referenced in <Varname2> (Page 529). It is a local name within the HTML page.
<Varname2> If a Use clause is provided, Varname2 is the variable to be written. It can be a PLC
tag name from your STEP 7 program or a tag from a specific data block.
For both Name clauses and Use clauses, the complete name must be enclosed in single
quotation marks. Within the single quotes, use double quotation marks around a PLC tag
and double quotation marks around a data block name. The data block name is within the
double quotes but not the data block tag name. Note that for data block tags, you use the
name of the block and not a data block numberOnly an admin user can write data to the CPU. The commands are ignored if the user has
not logged in as the admin user.
If a tag name or data block name includes special characters, you must use additional
quotation marks or escape characters as described in the topic "Handling tag names that
contain special characters (Page 534)".
11.3.2.3 Reading special variables
The server provides the ability to read values from the PLC to store in special variables
in the response header. You might, for example, want to read a pathname from a PLC
tag to redirect the URL to another location using the HEADER:Location special variable.The type of special variable and is one of the following:
HEADER
COOKIE_VALUE
COOKIE_EXPIRES
<Name> Refer to documentation for a list of all the names of HEADER variables. A
few examples are listed below:
Status: response code
Location: path for redirection
Retry-After: how long service is expected to be unavailable to the requesting client
For types COOKIE_VALUE and COOKIE_EXPIRES, <Name> is the name of a
specific cookie.
COOKIE_VALUE:name: value of the named cookie
COOKIE_EXPIRES:name: expiration time in seconds of named cookie
The Name clause must be enclosed in single or double quotation marks.
If no Use clause is specified, the special variable name corresponds to a PLC tag
name. Enclose the complete Name clause within single quotation marks and the
PLC tag in double quotation marks. The special variable name and PLC tag name
must match exactly.
<Varname> Name of the PLC tag or data block tag for the variable to be read into
The Varname must be enclosed in single quotation marks. Within the single
quotes, use double quotation marks around a PLC tag or data block name. The
data block name is within the double quotes but not the data block tag name. Note
that for data block tags, you use the name of the block and not a data block
number. The server provides the ability to write values to the CPU from special variables in the
request header. For example, you can store information in STEP 7 about the cookie
associated with a user-defined page, the user that is accessing a page, or header
information. The server provides access to specific special variables that you can write
to the CPU when logged in as the admin user. The type of special variable and is one of the following:
HEADER
SERVER
COOKIE_VALUE
<Name> Specific variable within the types defined above, as shown in these examples:
HEADER:Accept: content types that are acceptable
HEADER:User-Agent: information about the user agent originating the request.
SERVER:current_user_id: id of the current user; 0 if no user logged in
SERVER:current_user_name: name of the current user
COOKIE_VALUE:<name>: value of the named cookie
Enclose the Name clause in single quotation marks.
If no Use clause is specified, the special variable name corresponds to a PLC
variable name. Enclose the complete Name clause within single quotation marks
and the PLC tag in double quotation marks. The special variable name must match
the PLC tag name exactly.
Refer to documentation for a list of all the names of HEADER variables.
<Varname> The variable name in your STEP 7 program into which you want to write the special
variable, which can be a PLC tag name, or a data block tag.
The Varname must be enclosed in single quotation marks. Within the single
quotes, use double quotation marks around a PLC tag or data block name. The
data block name is within the double quotes but not the data block tag name. Note
that for data block tags, you use the name of the block and not a data block
number