Handling Tag Names That Contain Special Characters - Siemens S7-1200 System Manual
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Examples
<--! AWP_Out_Variable Name='HEADER:Status', Use='"Status"',
11.6.2.11
Handling tag names that contain special characters
When specifying variable names in user-defined Web pages, you must take special care if
tag names contain characters that have special meanings.
Reading variables
You use the following syntax to read a variable (Page 629):
:=:
The following rules apply to reading variables:
● For variable names from the PLC tag table, enclose the tag name in double quotation
● For variable names that are data block tags, enclose the data block name in double
● For variable names that are direct I/O addresses, memory addresses, or alias names, do
● For tag names or data block tag names that contain a backslash, precede the backslash
● If a tag name or data block tag name contains a colon, less than sign, greater than sign,
Table 11- 1
Data block name
n/a
n/a
n/a
n/a
Data_block_1
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Name='HEADER:Location', Use="Location",
Name='COOKIE_VALUE:name', Use="my_cookie" -->
marks.
quotation marks. The tag is outside of the quotation marks.
not use quotation marks around the read variable.
with another backslash.
or ampersand define an alias that has no special characters for the read variable, and
read the variable using the alias. Precede colons in tag names in a Use clause with a
backslash.
Examples of Read variables
Tag name
ABC:DEF
T\
A \B 'C :D
a
Tag_1
Read command
:=special_tag:
:="T\\":
:=another_special_tag:
:=a_less_than_b:
:="Data_block_1".Tag_1:
Web server
11.6 User-defined Web pages
639
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