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The STEP 7 program must execute the instruction for the user-defined pages to
be accessible from the standard pages. You might want the user-defined pages
available only under certain circumstances as dictated by your application requirements and
preferences. In this case, your program logic can control when to call the instruction. he instruction
The STEP 7 program must execute the instruction for the user-defined pages to
be accessible from the standard pages. You might want the user-defined pages
available only under certain circumstances as dictated by your application requirements and
preferences. In this case, your program logic can control when to call the instruction. You must provide the control data block input parameter (CTRL_DB) which corresponds to
the integer DB number of the control DB. You can find this control DB block number (called
DB Number) in the Server properties of the CPU after you create the blocks for
the user-defined pages. Enter the integer DB number as the CTRL_DB parameter of
the instruction. The return value (RET_VAL) contains the function result. Note that the
instruction executes asynchronously and that the RET_VAL output might have an
initial value of 0 although an error can occur later. The program can check the state of the
control DB to ensure that the application started successfully, or check RET_VAL with a
subsequent call to . STEP 7 creates the control data block when you click "Generate blocks" and displays the
control DB number in the User-defined 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 server or to subsequently reenable
it. Also, for user-defined pages that you create as manual fragment DBs (Page 535),
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 userdefined
page control (Page 555).
11.3.5 Downloading the program blocks to the CPU
After you have generated the blocks for user-defined 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 page
program blocks when the CPU is in STOP mode. You access your user-defined pages from the standard pages (Page 505). The
standard pages display a link for "User Pages" on the left side menu where the links to
the other pages appear. When you click the "User Pages" link, your browser goes to
the page that provides access to your default page. From within the user-defined content
area, navigation is according to how you designed your specific pages.
The server displays the user-defined page content within the framework of the standard
page display. That is, the header frame at the top and the login and navigation frames
at the left remain in fixed positions.
The constraints for standard pages (Page 558) also apply to user-defined pages.
In addition, user-defined pages have some specific considerations. ce
Your user-defined 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
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 pages and see
the load memory consumption.
Note
If you need to reduce the space required for your user-defined pages, reduce your use
of images if applicable. As an example of a user-defined page, consider a page that is used to remotely
monitor and control a wind turbine: This example page is in English, but you can, of course, use any language when you are
developing your own HTML pages. In this application, each wind turbine in a wind turbine farm is equipped with an for
control of the turbine. Within the STEP 7 program, each wind turbine has a data block with
data specific to that wind turbine and location.
The user-defined page provides remote turbine access from a PC. A user can connect
to standard pages of the CPU of a particular wind turbine and access the user-defined
"Remote Wind Turbine Monitor" page to see the data for that turbine. An admin user
can also put the turbine in manual mode and control the variables for turbine speed, yaw,
and pitch from the page. An admin user can also set a braking value regardless of
whether the turbine is under manual or automatic control.
The STEP 7 program would check the Boolean values for overriding automatic control, and if
set, would use the user-entered values for turbine speed, yaw, and pitch. Otherwise, the
program would ignore these values. This user-defined page example consists of three files: