Technical data of CPU 31xC   
6.6 Technical data of the integrated I/O 
  CPU 31xC and CPU 31x, Technical Data 
6-38  Manual, 01/2006 Edition, A5E00105475-06 
6.6.3  Parameterization 
Introduction 
You configure the integrated I/O of CPU 31xC with STEP 7. Always make these settings 
when the CPU is in STOP. The generated parameters are downloaded from the PG to the 
S7-300 and written to CPU memory . 
You can also choose to change the parameters at SFC 55 in the user program (see the 
Reference Manual 
System and Standard Functions
). Refer to the structure of record 1 for 
the respective parameters. 
Parameters of standard DI 
The table below gives you an overview of the parameters for standard digital inputs. 
Table 6-7  Parameters of standard DI 
Parameters  Value range  Default  Range of efficiency 
Input delay (ms)  0,1/0,5/3/15  3  Channel group 
The table below gives you an overview of the parameters when using digital inputs as 
interrupt inputs.  
Table 6-8  Parameters of the interrupt inputs 
Parameters  Value range  Default  Range of efficiency 
Interrupt input  Disabled / 
 positive edge 
De-activated  digital input 
Interrupt input  Disabled/ 
 negative edge 
De-activated  digital input 
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