Product description 
  1.6 System components 
SIMATIC IPC PX-39A PRO 
Operating Instructions, 11/2022, A5E51699950-AA  
23 
1.6.5  Extension Unit and operator controls 
Extension components - Extension Unit 
 
-39A PRO is extended with an Extension Unit, the effect on the device 
approvals for the entire system must be taken into account. 
The Extension Unit is used to install additional operator controls under a SIMATIC PRO device 
of the type "Suitable for extension components" with 16:9 display. 
The example in the figure below shows the Extension Unit 22" with eight operator controls 
including emergency stop button. 
 
The operator controls on the Extension Units can be customized. The Extension Units come 
without operator controls. The available slots are suitable for installation of operator controls. 
The Extension Units are available in 4 different sizes:  
•  15" 
•  19" 
•  22" 
•  24"