Hi All,

My CPU 315F-2 PN/DP randomly goes to off state. after i restart the power it becomes ok.

i attach the diagnostic buffer file here.

any help is highly appreciated.

this plc is used in an automated car park system. plc # 6ES7 315-2F J14-0AB0 / V3.2 firmware

Thanks

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Split from Error Event ID 16#38B3 occured.

Hi Suren DXB,

I assume you mean, your PLC is randomly going to STOP state. If it is really the OFF state, you should check your power supply. For STOP state, the diagnostic buffer should be saved while the PLC is in STOP state. Your data is only showing diagnostic interrupts and remove/insert events. This might be okay, it strongly depends on your hardware and your setting.

Without the stop event in the diagnostics data, we would not be able to help you. Your PLC will allow setting the amount of events in the diagnostic data up to 500. Maybe this will help you find the cause of your issue. But this means you will have to change the PLC project. Would you be able to change it? Please tell us, which software you are using, and we can show you how to change the setting.

Kind regards
Stefan

Hi stefan,

thank you for your reply.

we use simatic manager step 7 for the plc

Hi Suren DXB,

as already mentioned, for further diagnosis, the content of the diagnostic buffer is required immediately after the problem has occurred.

To allow more than ten entries in the diagnostic buffer, you can extend the number of messages can be increased.

Kind regards
Stefan