Important information   
 
  Firmware/BIOS description SIMATIC IPC BX-39A, IPC PX-39A, IPC PX-39A PRO 
4  Operating Instructions, 01/2023, A5E51110693-AA 
Changing firmware settings 
The firmware settings are preset for working with the included software. You should only 
change the default firmware settings if technical changes to your device require other 
settings. 
 
Malfunctions can occur with running software CPU 
If a PC firmware/BIOS update is being performed while a SIMATIC Software Controller, such 
as a SIMATIC WinAC, is running, the software CPU can malfunction, resulting in 
communication interruptions or failures, among other things. Other actions that put a 
heavy load on the PC hardware, for example, running hardware tests such as benchmarks, 
can result in malfunctions of the software CPU. 
Do not run a firmware/BIOS update or other actions that would put a heavy load on the 
hardware during operation of a software CPU. 
Switch the software CPU to "STOP" before you run a firmware/BIOS update or perform other 
Security information 
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secure operation of plants, systems, machines and networks. 
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Customers are responsible for preventing unauthorized access to their plants, systems, 
machines and networks. Such systems, machines and components should only be connected 
to an enterprise network or the internet if and to the extent such a connection is necessary 
and only when appropriate security measures (e.g. firewalls and/or network segmentation) 
are in place.  
For additional information on industrial security measures that may be implemented, please 
visit (https://www.siemens.com/industrialsecurity). 
Siemens’ products and solutions undergo continuous development to make them more 
secure. Siemens strongly recommends that product updates are applied as soon as they are 
available and that the latest product versions are used. Use of product versions that are no 
longer supported, and failure to apply latest updates may increase customer’s exposure to 
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