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Siemens AG
Entry type: Product note Entry ID: 4132236, Entry date: 08/27/1996
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IM 308B Interface Module for ET 200U - Product Information

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Concerns the product with Catalog No.:                                      

                                                                            

6ES5 308-3UB11   IM 308 for S5-115U/135U/150U/155U                          

                                                                            

                                                                            

                                                                            

_Limitations of the load-voltage monitoring function:_                      

                                                                            

Description of the problem:                                                 

                                                                            

If the IM 308B is used in S5-135U, -150U/H or -155U/H PLCs and              

the load-voltage monitoring function is activated (jumper AB-EX             

in the power-supply unit of the central controller open), a STOP            

of the CPU can lead to a condition where the outputs of the                 

distributed I/Os are not reset.                                             

                                                                            

Preconditions for this response are:                                        

- Operation with load-voltage monitor.                                      

- Load-voltage monitor is triggered (load voltage failure, i.e.             

  BASP (output inhibit) is generated by the power supply).                  

- Change of operating mode of the CPU to STOP while the load-               

  voltage monitor is triggered (e.g. due to a fault, activation             

  of the STOP switch, etc.).                                                

                                                                            

_Functional limitation:_                                                    

The above PLCs may not be operated with load-voltage monitor if             

an IM 308B module is plugged in, i.e. jumper AB-EX of the power             

supply must be in place.                                                    

                                                                            

_Limitation of the program check function:_                                 

                                                                            

If the user program is tested with the program check function,              

outputs of the distributed I/Os will be set even though the CPU             

is outputting a BASP signal (concerns PLCs S5-115/135/150/155U).            

                                                                            

If you use this function, make very sure that the setting of the            

outputs causes no dangerous conditions (e.g. by switching the               

control voltage off).                                                       

                                                                            

                                                                            

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