Hello forum Experts,

I have a SIMATIC IPC BX-39 6AG4142-7FH12-2AB0 with software controller CPU 1507S F 6ES7672-7FC02-0YG0.

Everything works fine apart from the shutdown of windows from PLC program with the SHUT_DOWN instruction. I can reboot it but not shut it down; the screen keeps showing the "Shutting down" view indefinitely and we have to kill it by removing power supply.

The PC comes with two SSD drives: one for the OS and software controller and one for data saving; after some trials in which we have also formatted the PC at factory settings (as suggested by technical support) we have discovered that if we remove the second SSD the SHUT_DOWN function from PLC program works correctly! 

So if we have two SSDs the SHUT_DOWN functions doesn't work and Windows remain stuck in "Shutting down" mode while with only one SSD everything is fine.

How can it be possible???

Does someone has some hints?

Thank you

Hello !!

Hello Hank88,

thank you for your reply.

Yes, we have tried the other modes of FC SHUT_DOWN and they all work, only mode 1 seems to stuck.

While looking at the event viewer of Windows we have noticed something strange:

• in the shutdown event the reason is missing even if we have specified a comment in the TIA Portal program (picture 1 and picture 2);
• after the shutdown has begun we have the event 129 stornvme that keeps repeating every 10 seconds (picture 3);

we can't find a reason for that...

Hello,

technical support has indicated as a temporary solution to disable the Hyperthreading function is the BIOS settings and this has apparently solved the issue but the drawback is that the CPU usage has almost doubled.

Let's see if they can suggest a more definitive solution.