Siemens SIMATIC S7-1200 System Manual page 1080

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12.7 User-defined Web pages

Struct members of requesttab struct

fragment_index

// Request Commands

// Request states

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 1059).

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

Possible techniques for using the fragment_index include:

● Processing the current fragment: Leave fragment_index unchanged and set the continue

● 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.

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.

Number of the current web page

Number of the current fragment - can be set to

a different fragment

Enables current page/fragment for sending and

continues with the next fragment

Enables current page/fragment for resending

and continues with the same fragment

Close http connection without sending

Send this fragment; page is complete - do not

process any additional fragments

The request states are read-only

Nothing to do, but active

Fragment is waiting to be enabled

Fragment is sending

User has aborted current request

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Siemens SIMATIC S7-1200 System Manual page 1080

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