Communication   
11.2 PROFINET 
  S7-1200 Programmable controller 
950  System Manual, V4.2, 09/2016, A5E02486680-AK 
7.  Select the "Shared device" area in the properties of the I-device: 
–  In the table, all transfer areas and the PROFINET interface are assigned to the local 
IO controller (Controller1). 
–  Define the transfer areas to which the Controller1 CPU should 
 have access. Select 
the "---" entry for these areas. These transfer areas are provided for Controller2.