Technical specifications   
11.14 Mobile Panel 2nd Generation F-FBs 
  Mobile Panels 2nd Generation 
266  Operating Instructions, 09/2018, A5E33876626-AC 
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.