Siemens SIMATIC HMI Series Operating Instructions Manual page 266

Technical specifications
11.14 Mobile Panel 2nd Generation F-FBs
Cascading
In order to use more than two HMI devices on a connection box, you can cascade multiple
F_FB_KTP_RNG blocks. Cascading F_FB_KTP_RNG works with the same ID. The following
figure shows an example of the cascade structure of the multiple F_FB_KTP_RNG.
266
Mobile Panels 2nd Generation
Operating Instructions, 09/2018, A5E33876626-AC