Siemens CPU 31 Series Technical Data Manual page 20

Operating and display elements
2.1 Operating and display elements: CPU 31xC
The figures show
(1)
(2)
(3)
(4)
(5)
(6)
(7)
The figure below illustrates the integrated digital and analog I/Os of the CPU with open front
covers.
Figure 2-1
The figures show
(1)
(2)
(3)
2-2
the following CPU elements
Status and error displays
Slot for the SIMATIC Micro Memory Card (MMC) incl. the ejector
Connections of the integrated I/O.
Power supply connection
2. Interface X2 (PtP or DP)
1. Interface X1 (MPI)
Mode selector switch
1 2
1 2
Integrated I/Os of CPU 31xC (CPU 314C-2 PtP, for example)
the following integrated I/Os
Analog I/Os
each with 8 digital inputs
each with 8 digital outputs
2 3
3
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06