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ihatemitsubishiplcs

PLC occasionally going out of Run mode?

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Posted (edited)

Has anyone had an issue with Siemens plc's occasionally going out of run mode? I was doing some research and found that it could be due to a bad analog input.

Is there a way to tell which input or output is causing this fault? I know I can create a hardware diagnostics error organization block but that only correct from what I've read.  

 

Edit:

I've added a screen shot of the diagnostics report. The fault that may be the problem is: Temporary CPU error: Serious firmware exception  CPU changes to DEFECTIVE mode (system reaction) 

This plc / system was installed 2 year ago and we've had this problem occasionally since. I'm guessing the wrong firmware was used during the install. Will try upgrading firmware this weekend. 

 

screenshot.63.jpg

Edited by ihatemitsubishiplcs
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Go online and look in the diagnostic buffer

what cpu? 

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Would this show past faults even if the CPU was put back into run mode? It was a co worker who put the plc back into run mode and I'm just trying to find out why it keeps happening. 

Also the PLC is an IM 155-6 PN ST

 

Thanks for your help.

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