Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 21)

Operating and display elements
2.2 Operating and display elements: CPU 31x
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
2-5
2.2 Operating and display elements: CPU 31x
2.2.1 Operating and display elements: CPU 312, 314, 315-2 DP:
Operating and display elements
SF
BF
DC5V
RUN
STOP
RUN
STOP
MRES
FRCE
X2 X1
MMC
1
2
3
4
5
6
The figures show the following CPU elements
(1) Slot for the Micro Memory Card (MMC), incl. the ejector
(2) 2. Interface X2 (only for CPU 315-2 DP)
(3) Power supply connection
(4) 1. Interface X1 (MPI)
(5) Mode selector switch
(6) Status and error displays