Reading Special Variables - Siemens S7-1200 System Manual

Examples using HTML input field
<!-- AWP_In_Variable Name='"Target_Level"' -->
<form method="post">
<p>Input Target Level: <input name='"Target_Level"' type="text" />
</p>
</form>
<!-- AWP_In_Variable Name='"Data_block_1".Braking' -->
<form method="post">
<p>Braking: <input name='"Data_block_1".Braking' type="text" />
%</p>
</form>
<!-- AWP_In_Variable Name='"Braking"' Use='"Data_block_1".Braking' -
->
<form method="post">
<p>Braking: <input name='"Braking"' type="text" /> %</p>
</form>
Example using HTML select list
<!-- AWP_In_Variable Name='"Data_block_1".ManualOverrideEnable'-->
<form method="post">
<select name='"Data_block_1".ManualOverrideEnable'>
<option value=:"Data_block_1".ManualOverrideEnable:> </option>
<option value=1>Yes</option>
<option value=0>No</option>
</select><input type="submit" value="Submit setting" /></form>
Note
Only a user with privileges to modify variables can write data to the CPU. The Web server
ignores the commands if the user does not have modify privileges.
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)".
11.6.2.3

Reading special variables

The Web server provides the ability to read values from the PLC to store in special variables
in the HTTP 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.
Syntax
<!-- AWP_Out_Variable Name='<Type>:<Name>' [Use='<Varname>'] -->
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Web server
11.6 User-defined Web pages
631