Siemens Industry Online Support
Siemens AG
Entry type: Product note Entry ID: 4342303, Entry date: 09/01/1997

CPU 315-2 - New Revision Level 02

  • Entry
  • Associated product(s)

Concerns the product with Catalog No.:                                      


6ES7 315-2AF01-0AB0    CPU 315-2 DP, 48 kbyte, 0.3 ms/Kstatm.               



Revision level 02 of the CPU 315-2 eliminates the following problem:        


After power ON with battery backup the CPU would sporadically run in an     

endless loop (STOP LED is lit and RUN LED flashes) and would not enter      

RUN mode even after power OFF / power ON.                                   


To return the CPU to RUN, the battery had to be removed during power OFF    

and the power switched ON again. Once the CPU was in RUN, the battery       

could be returned (the diagnostics buffer of the CPU would then read        

"4550" and "F102").                                                         




Please note: Revision level 03 is now available for the above CPU.          

See SIMATIC S7 User Info No. 1997/03/008 for details or speak to your       

SIMATIC contact at your local Siemens office about an upgrade to revi-      

sion level 03.                                                              




Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
Rate entry
no rating
Requests and feedback
What do you want to do?
Note: The feedback always relates to the current entry / product. Your message will be forwarded to our technical editors working in the Online Support. In a few days, you will receive a response if your feedback requires one. If we have no further questions, you will not hear from us.