Downloading The Program Blocks To The Cpu - Siemens SIMATIC S7-1200 System Manual

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12.7 User-defined Web pages

Usage of the Control DB

STEP 7 creates the control data block when you click "Generate blocks" and displays the

control DB number in the User-defined Web pages properties. You can find the control DB

as well in the Program blocks folder in the project navigation tree.

Typically, your STEP 7 program uses the control DB directly as created by the "Generate

blocks" process with no additional manipulation. However, the STEP 7 user program can set

global commands in the control DB to deactivate the web server or to subsequently re-

enable it. Also, for user-defined pages that you create as manual fragment DBs (Page 1057),

the STEP 7 user program must control the behavior of these pages through a request table

in the control DB. For information on these advanced tasks, see the topic Advanced user-

defined Web page control (Page 1078).

Downloading the program blocks to the CPU

After you have generated the blocks for user-defined Web pages, they are part of your STEP

7 program just like any other program blocks. You follow the normal process to download the

program blocks to the CPU. Note that you can only download user-defined Web page

program blocks when the CPU is in STOP mode.

S7-1200 Programmable controller

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