Siemens SIMATIC S7-1200 System Manual page 1081

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The following example shows a STEP 7 user program that is checking for a fragment with an

ID of 1 to be in the waiting state, following a prior call to the WWW instruction. It might also

wait for other application-specific conditions to occur. Then it performs whatever processing

is necessary for the fragment, such as setting data block tags, performing calculations, or

other application-specific tasks. Afterwards, it sets the continue flag so that the Web server

will execute this fragment.

When the program calls the WWW instruction with this modified control DB, the user-defined

Web page with this fragment can be displayed from the Web browser.

Note that this is a simplified example; the fragment to check could be in any one of the four

requesttab structs in the array.

S7-1200 Programmable controller

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

12.7 User-defined Web pages