Siemens SIMATIC S7-1200 - 12.7.9.4 Writing user input to the controller

Web server
12.7 User-defined Web pages
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1067
12.7.9.4
Writing user input to the controller
The "Remote Wind Turbine Monitor" HTML page includes several AWP commands for
writing data to the controller (Page 1045). The HTML page declares AWP_In_Variables for
Boolean variables so that a user with privileges to modify variables can put the wind turbine
under manual control and enable manual override for the turbine speed, yaw override,
and/or blade pitch override. The page also uses AWP_In_Variables to allow a user with
privileges to modify variables to subsequently set floating-point values for the turbine speed,
yaw, pitch, and braking percentage. The page uses an HTTP form post command to write
the AWP_In_Variables to the controller.
For example, consider the HTML code for manually setting the braking value:
Example HTML code
The following excerpt from the "Remote Wind Turbine Monitor" HTML page first declares an
AWP_In_Variable for "Data_block_1" that enables the HTML page to write to any tags in the
data block "Data_block_1". The page displays the text "Braking:" in the left cell of a table
row. In the right cell of the table row is the field that accepts user input for the "Braking" tag
of "Data_block_1". This user input value is within an HTML form that uses the HTTP method
"POST" to post the entered text data to the CPU. The page then reads the actual braking
value from the controller and displays it in the data entry field.
A user with privileges to modify variables can subsequently use this page to write a braking
value to the data block in the CPU that controls braking.
<!-- AWP_In_Variable Name='"Data_block_1"' -->
...
<tr style="vertical-align: top; height: 2%;">
<td style="width: 22%;"><p>Braking:</p></td>
<td>
<form method="POST">
<p><input name='"Data_block_1".Braking' size="10" type="text"> %</p>
</form>
</td>
</tr>
Note
Note that if a us
er-defined page has a data entry field for a writable data block tag that is a
string data type, the user must enclose the string in single quotation marks when entering
the string value in the field.
Note
Note that if you declare an entire data block
in an AWP_In_Variable declaration such as <!--
AWP_In_Variable Name='"Data_block_1"' -->, then every tag within that data block can be
written from the user
-
defined Web page. Use this when you intend for all of the tags in a data
block to be writable. Othe
rwise, if you only want specific data block tags to be writable from
the user
-defined Web page, declare it specifically with a declaration such as <!--
AWP_In_Variable Name='"Data_block_1".Braking' -->