Siemens SIMATIC HMI series Operating Instructions Manual page 26

Overview
1.5 System components and accessories
Extension components - Extension Unit
The Extension Unit is used to install additional operator controls below a SIMATIC PRO
device for pedestal (extendable, flange bottom) or for support arm (extendable, round tube).
By way of example, 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 possible mounting spaces are prepared for installation of
operator controls.
The Extension Units are available in four sizes:
● Extension Unit 12"
● Extension Unit 15"
● Extension Unit 19"
● Extension Unit 22"
In each Extension Unit size, you have the flexibility to choose between the following interface
variants for connection to the system:
● Hardwired
● PROFINET
● PROFIsafe
In addition, different operator controls, such as Emergency Stop pushbutton, selector switch,
illuminated pushbutton, keyswitch, indicator light and RFID reader, are available.
Note
Only operator controls with Siemens approval may be installed in the Extension Unit.
Additional information
You can find additional information on system components for full-enclosed IP65-protected
devices on the Internet
(https://mall.industry.siemens.com/mall/en/WW/Catalog/Products/10268745).
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IFP, IFP PRO, IFP ETH
Operating Instructions, 11/2017, A5E31298376-AH