Siemens SIMATIC S7-1200

Web server
12.7 User-defined Web pages
S7-1200 Programmable controller
1062 System Manual, V4.2, 09/2016, A5E02486680-AK
12.7.8
Constraints specific to user-defined Web pages
The constraints for standard Web pages (Page 1082) also apply to user-defined Web pages.
In addition, user-defined Web pages have some specific considerations.
Load memory space
Your user-defined Web pages become data blocks when you click "Generate blocks", which
require load memory space. If you have a memory card installed, you have up to the
capacity of your memory card as external load memory space for the user-defined Web
pages.
If you do not have a memory card installed, these blocks take up internal load memory
space, which is limited according to your CPU model.
You can check the amount of load memory space that is used and the amount that is
available from the Online and Diagnostic tools in STEP 7. You can also look at the properties
for the individual blocks that STEP 7 generates from your user-defined Web pages and see
the load memory consumption.
Note
If you need to reduce the space required for your user
-defined Web pages, reduce your use
of images if applicable.
Quotation marks in text strings
Avoid using text strings that contain embedded single or double quotation marks in data
block tags that you use for any purpose in user-defined Web pages. Because HTML syntax
often uses single quotes or double quotes as delimiters, quotation marks within text strings
can break the display of user-defined Web pages.
For data block tags of type String that you use in user-defined Web pages, observe the
following rules:
● Do not enter single or double quotation marks in the data block tag string value in
STEP 7.
● Do not let the user program make assignments of strings containing quotes to these data
block tags.