Technical data of CPU 31x 
  7.5 CPU 315-2 PN/DP 
CPU 31xC and CPU 31x, Technical Data 
Manual, 01/2006 Edition, A5E00105475-06 
7-23 
Technical data 
•  OP communication 
–  Reserved (default) 
–  Configurable 
Max. 15 
1 
1 to 15 
•  S7-based communication 
–  Reserved (default) 
–  Configurable 
Max. 14 
0 
0 to 14 
Routing 
•  Interface X1 configured as 
–  MPI 
–  DP master 
–  DP slave (active) 
•  Interface X2 configured as PROFINET 
Yes  
 
Max. 10 
Max. 24 
Max. 14 
Max. 24 
CBA (at 50 % communication load) 
•  Maximum data length for arrays and 
structures between two partners 
–  Acyclic PROFINET interconnections 
–  Cyclic PROFINET interconnections 
–  Local interconnections 
 
 
1400 bytes 
450 bytes 
Slave-dependent 
•  Number of coupled PROFIBUS devices 
16 
•  Total of all master/slave connections 
1000 
•  Number of device-internal and PROFIBUS 
interconnections 
500 
•  Number of remote interconnecting partners 
32 
Remote interconnections with acyclical transmission 
Scan rate: Minimum scan interval  500 ms 
Number of incoming interconnections  100 
Number of outgoing interconnections  100 
Remote interconnections with cyclical transmission 
Scan rate: Minimum scan interval  10 ms 
Number of incoming interconnections  200 
Number of outgoing interconnections  200 
HMI interconnections via PROFINET (acyclic) 
HMI interconnections  500 ms 
Number of HMI variables  200 
Sum of all interconnections  4000 bytes input/4000 bytes output 
interfaces 
1st interface 
Type of interface  Integrated RS485 interface 
Physics  RS 485 
electrically isolated  Yes 
Interface power supply 
 (15 to 30 VDC) 
Max. 200 mA