Preface   
  CPU 31xC and CPU 31x, Technical Data 
iv  Manual, 01/2006 Edition, A5E00105475-06 
 
Note 
For information on the special features of the CPU 315F-2 DP (6ES7 315-6FF00-0AB0) and 
CPU 317F-2 DP  
(6ES7 317-6FF00-0AB0), refer to the product information in the Internet: 
http://support.automation.siemens.com under article ID 17015818. 
 
 
 
Note 
There you can obtain the descriptions of all current modules. For new modules, or modules 
of a more recent version, we reserve the right to include a Product Information containing 
latest information. 
 
Changes in comparison to the previous version 
Compared to the previous version of this manual CPU31xC and CPU31x, Technical Data, 
with the footnote number: A5E00105475-05, Release 08/2004, there are following changes: 
•  CPU 319-3 PN/DP, 6ES7 318-3EL00-0AB0, Firmware V2.4.0, supplemented 
•  Product information A5E00385496-01 integrated into manual 
New features of CPU 319-3 PN/DP: 
•  Increased instruction-processing performance 
•  Expansion of quantity structures: 
–  1.4 MB work memory 
–  4096 modules 
•  CPU with 3 interfaces (1xMPI/DP, 1xDP and 1xPN) 
•  Isochronous mode for a sub-process diagram 
•  New system functions: 
–  Measuring initiator for diagnostic repeater (SFC 103) 
•  New message blocks (SFC105-108) 
•  Addition of following protocol versions to open communication via Industrial Ethernet: 
–  Connection oriented protocol: ISO on TCP according to RFC 1006 
–  Connectionless protocol: UDP according to RFC 768 
Approvals 
The SIMATIC S7-300 product series has the following approvals: 
•  Underwriters Laboratories, Inc.: UL 508 (Industrial Control Equipment) 
•  Canadian Standards Association: CSA C22.2 No. 142, (Process Control Equipment) 
•  Factory Mutual Research: Approval Standard Class Number 3611