Siemens S7-1200 System Manual page 632

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11.6 User-defined Web pages

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 639).

Example: Reading a special variable with no Use clause

In this example, the HTTP special variable "HEADER:Status" receives the value of the PLC

tag "HEADER:Status". The name in the PLC tag table must match the name of the special

variable exactly if no Use clause is specified.

Example: Reading a special variable with a Use clause

In this example, the HTTP special variable "HEADER:Status" receives the value of the PLC

tag "Status".

The type of special variable, which is one of the following:

COOKIE_VALUE

COOKIE_EXPIRES

Refer to HTTP 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.

Name of the PLC tag or data block tag into which the variable is to be read

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

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG