Technical data of CPU 31x 
  7.8 CPU 319-3 PN/DP 
CPU 31xC and CPU 31x, Technical Data 
Manual, 01/2006 Edition, A5E00105475-06 
7-45 
Technical data 
•  Number of GD packets, sender, Max. 
8 
•  Number of GD packets, receiver, Max. 
8 
•  Size of GD packets, Max. 
22 bytes 
•  Size of GD packets, consistent, Max. 
22 bytes 
S7 basic communication   
•  supported 
Yes 
•  User data per job, Max. 
76 bytes 
•  User data per job, consistent, Max. 
64 bytes (for X_SEND or X_RCV), 64 bytes (for 
X_PUT or X_GET as the server) 
S7 communication   
•  supported 
Yes 
•  As server 
Yes 
•  As client 
Yes (via integrated PN interface and loadable 
FBs, or even via CP and loadable FBs) 
•  User data per job 
–  Consistent data 
Refer to Step 7 Online Help, 
Parameters of 
SFBs/FBs and SFC/FC of the S7 communication)
S5compatible communication   
•  supported 
Yes (via CP and loadable FCs) 
Number of connections   
•  Total 
32 
usable for PG communication  31 
•  PG communication, reserved 
1 
•  PG communication, configurable, Max. 
31 
usable for OP communication  31 
•  OP communication, reserved 
1 
•  OP communication, configurable, Max. 
31 
usable for S7 basic communication  30 
•  S7 basic communication, reserved 
0 
•  S7 basic communication, configurable, Max. 
30 
PROFINET CBA  
Reference setting for the CPU communication 
load 
20% 
Number of remote interconnecting partners  32 
Number of master/slave functions  50 
Total of all master/slave connections  3000 
Data length of all incoming master/slave 
connections, Max. 
24000 bytes 
Data length of all outgoing master/slave 
connections, Max. 
24000 bytes 
Number of device-internal and PROFIBUS 
interconnections 
1000 
Data length of the device-internal and PROFIBUS 
interconnections, Max. 
8000 bytes