ihatemitsubishiplcs

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About ihatemitsubishiplcs

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  1. PLC occasionally going out of Run mode?

    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.
  2. PLC occasionally going out of Run mode?

    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.