Siemens S7-1200 System Manual page 662
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- Operating instructions manual (132 pages) ,
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Web server
11.6 User-defined Web pages
Block tag
sending
aborting
Operation
Whenever your program makes changes to the control DB, it must call the WWW instruction
with the number of the modified control DB as its parameter. The global commands and
request commands take effect when the STEP 7 user program executes the WWW
instruction (Page 642).
The STEP 7 user program can set the fragment_index explicitly, thus causing the Web
server to process the specified fragment with a request command. Otherwise, the Web
server processes the current fragment for the current page when the WWW instruction
executes.
Possible techniques for using the fragment_index include:
● Processing the current fragment: Leave fragment_index unchanged and set the continue
command.
● Skip the current fragment: Set fragment_index to 0 and set the continue command.
● Replace current fragment with a different fragment: Set the fragment_index to the new
fragment ID and set the continue command.
To check global states or request states that might be changing, the STEP 7 user program
must call the WWW instruction to evaluate the current values of these states. A typical usage
might be to call the WWW instruction periodically until a specific state occurs.
Note
If the STEP 7 user program sets more than one request command, the WWW instruction
processes only one in this order of precedence: abort, finish, repeat, continue. The WWW
instruction clears all of the request commands after processing.
662
Data type
BOOL
BOOL
Description
Fragment is sending
User has aborted current request
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
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