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Entry type: Product note Entry ID: 4139194, Entry date: 08/27/1996
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Memory Submodules for S5-115U - New Revision Levels

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  • Associated product(s)
                                                                            

                                                                            

Concerns products with the Order Nos.:                                      

                                                                            

6ES5 375-0LD11   375 RAM submodule, 8 Kbyte                                 

6ES5 375-0LD21   375 RAM submodule, 8 Kbyte                                 

6ES5 941-7UB11   CPU 941B, 18 Kbyte                                         

6ES5 942-7UB11   CPU 942B, 42 Kbyte                                         

                                                                            

                                                                            

                                                                            

If the above CPUs are operated with the RAM submodules                      

375-0LD11/21 (revision levels A06 or A04), faulty program pro-              

cessing can occur.                                                          

                                                                            

_Description of the problem:_                                               

                                                                            

The CPU will sporadically enter STOP mode with various fault con-           

ditions. In this case the fault register displayed in the ISTACK            

is never identical with the STEP 5 operation stored in the RAM              

submodule.                                                                  

                                                                            

Only a few cases have occurred and only memory submodules with              

a specific combination of components are affected. The criti-               

cal components can be identified from their labels as follows:              

                                                                            

                       KM 6264...                                           

                       ...Y   KOREA                                         

                                                                            

The fault has been corrected with the new revision levels                   

A07 and A05.                                                                

                                                                            

_Upgrading:_                                                                

                                                                            

If the fault occurs, return the memory submodules to your local             

Siemens office. Your SIMATIC contact will make the necessary                

arrangements.                                                               

                                                                            

                                                                            

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