Siemens SIMATIC S7-1500 Function Manual page 129

Web pages
3.16 User pages
Writing PLC tags
These in-tags (input direction as seen from the controller) are set on the browser page. This
can take place in a form on your HTML page, for example, with text input or list selection
boxes that correspond to the tags that can be written.
The tags are either set in the HTTP header (by cookie or POST method) or in the URL (GET
method) by the browser in the HTTP request and are then written by the web server into the
respective PLC tag.
Note
Write access during operation
In order for data to be written to the CPU from a user page, a user with corresponding write
rights must be set up and the user must be logged in as this user. This applies to all write
accesses of web pages to the CPU.
Syntax
<!-- AWP_In_Variable Name='"<Varname1>"' Name='"<Varname2>"'
Name='"<Varname3>"' -->
If the name of the tag that you are using for the web application is not identical with the name
of the PLC tag, you can assign it to a PLC tag with the "Use" parameter.
<!-- AWP_In_Variable Name='<Varname_Webapp>' Use='<PLC_Varname>' -->
Examples with HTML input fields
<!-- AWP_In_Variable Name='"Target_Level"' -->
<form method="post">
<p>Input Target Level: <input name='"Target_Level"'
type="text"><input type="submit" value="Write to PLC"> </p>
</form>
<!-- AWP_In_Variable Name='"Data_block_1".Braking' -->
<form method="post">
<p>Braking: <input name='"Data_block_1".Braking' type="text"> <input
type="submit" value="Write to PLC"></p>
</form>
Example with HTML selection list
<!-- AWP_In_Variable Name='"Data_block_1".ManualOverrideEnable' -->
<form method="post">
<select name='"Data_block_1".ManualOverrideEnable'>
<option value=1>Yes</option>
<option value=0>No</option>
</select><input type="submit" value="submit setting"> </form>
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Function Manual, 11/2019, A5E03484625-AG
Web server