Operating and display elements 
  2.2 Operating and display elements: CPU 31x 
CPU 31xC and CPU 31x, Technical Data 
Manual, 01/2006 Edition, A5E00105475-06 
2-9 
2.2.3  Operating and display elements: CPU 31x-2 PN/DP 
Operating and display elements 
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The figures show  the following CPU elements 
(1)  Bus error indicators  
(2)  Status and error displays 
(3)  Slot for the SIMATIC Micro Memory Card (MMC) incl. the ejector 
(4)  Mode selector switch 
(5)  Status display of 2nd interface (X2) 
(6)  2. Interface X2 (PN) 
(7)  Power supply connection 
(8)  1. Interface X1 (MPI/DP)