Siemens Industry Online Support
Siemens AG
Entry type: FAQ, Entry ID: 59601288, Entry date: 04/13/2012

How do you display the diagnostics buffer of a SIMATIC CPU with integrated web server on a SIMATIC Panel?

  • Entry
  • Associated product(s)

The web server of the SIMATIC CPU provides the user with web pages for displaying diagnostics information. A SIMATIC Panel with Internet Explorer can access the web pages. In this way the user can display the diagnostic buffer and more CPU information on the SIMATIC Panel.

The functional differences between the different SIMATIC Panels are given in Entry ID 40227286. This will help you determine which panels support the Internet Explorer.
You can use any SIMATIC CPU that supports the web server function.

Creation environment
This FAQ has been created with the software/hardware below.


Software / Hardware
1 SIMATIC HMI TP900 Comfort (order no.: 6AV2124-0JC01-0AX0)
2 CPU 317-2 PN/DP (order no.: 6ES7317-2EK14-0AB0 as from firmware version V3.2)
3 SIMATIC STEP 7 Professional V11 SP2
4 SIMATIC WinCC Professional V11 SP2
Table 01

Proceed as follows to have the diagnostics buffer of an S7 CPU displayed on the operator panel in Runtime.

  1. Configuration of the controller
  2. Configuration of the HMI operator panel
  1. Configuration of the controller
No. Procedure
1 Create controller
Create a SIMATIC controller in your project.
2 Define CPU properties
In the project navigation you open the device configuration of the SIMATIC controller and select the "Properties" tab. Click the "Web server" item and activate the "Enable web server on this module" option.

Save the settings and download the configuration into the SIMATIC controller.

Fig. 01

Table 02
  1. Configuration of the HMI operator panel
No. Procedure
1 Create operator panel
Create an operator panel in your project.
2 Create button
  • Add a button to your screen.
  • Change to the "Events" tab. Add the "OpenInternetExplorer" function and specify the IP address of the SIMATIC CPU as home page. In this example: ""

Fig. 02

Table 03

Note on security
The functions and solutions described in this article confine themselves predominantly to the realization of the automation task. Furthermore, please take into account that corresponding protective measures have to be taken in the context of Industrial Security when connecting your equipment to other parts of the plant, the enterprise network or the internet. More information can be found in Entry ID: 50203404.

Security information
In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about industrial security, please visit