Technical data of CPU 31xC 
  6.2 CPU 312C 
CPU 31xC and CPU 31x, Technical Data 
Manual, 01/2006 Edition, A5E00105475-06 
6-7 
Technical data 
MPI 
Services   
•  PG/OP communication 
Yes 
•  Routing 
No 
•  Global data communication 
Yes 
•  S7 basic communication 
Yes 
•  S7 communication 
–  As server 
–  As client 
 
Yes 
No 
•  Transmission rates 
Max. 187.5 kbps 
Programming 
Programming language  LAD/FBD/STL 
Available instructions  see the Instruction List 
Nesting levels  8 
System functions (SFCs)  see the Instruction List 
System function blocks (SFBs)  see the Instruction List 
User program security  Yes 
Integrated I/O 
•  Default addresses of the integrated 
–  Digital inputs 
–  Digital outputs 
 
124.0 to 125.1 
124.0 to 124.5 
Integrated functions 
Counters  2 channels (see the Manual 
Technological 
Functions
) 
Frequency counters  2 channels, Max. 10 kHz (see the Manual 
Technological Functions
) 
Pulse outputs  2 channels for pulse width modulation, Max. 2.5 
kHz (see the Manual 
Technological Functions
) 
Controlled positioning  No 
Integrated "Controlling" SFB  No 
Dimensions 
Mounting dimensions W x H x D (mm)  80 x 125 x 130 
Weight  409 g 
Voltages and currents 
Power supply (rated value)  24 VDC 
•  Permitted range 
20.4 V to 28.8 V 
Current consumption (no-load operation)  Typically 60 mA 
Inrush current  Typically 11 A 
Power consumption (nominal value)  500 mA 
I
2
t  0.7 A
2
s 
External fusing of power supply lines 
(recommended) 
LS switch Type C min. 2 A,  
LS switch Type B min. 4 A 
Power loss  Typically 6 W