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OS crash detection\reaction

Created by: Testermax at: 11/11/2009 3:08 PM (6 Replies)

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11/11/2009 3:08 PM	Rate (0)
Testermax Posts: 159 Rating: (3)	Hello! I have an issue which I really cant decide what is the best solution on. My problem is that my singlestation project (ES/OS station) crashed the other day while an operator was setting a bit to 1 from the OS. (see submittet picture). This pushbutton was held down when the power outage occurred. What happened was that the bit was kept =1 as it should be. I dont want that functionality, but I want this bit to be reset to =0 if this occurs again. How can I implement this functionality as easy as possible? Attachment watchdogHMI.jpg (105 Downloads)
Testermax Posts: 159 Rating: (3)
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11/11/2009 6:11 PM	Rate (0)
CBo Gold Member Joined: 4/5/2006 Last visit: 3/5/2025 Posts: 917 Rating: (63)	Hi Testermax , the simple and safe solution is ALWAYS reset bit in plc after uses: 1) WinCC set bit 2) plc detect bit=1 and execute function 3) at the end of FB (or cyclically) reset the bit Regards

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11/12/2009 1:00 PM	Rate (0)
Testermax Posts: 159 Rating: (3)	Hello CBo and thank you for quick reply! I`m not sure if I understood you right, I should reset my IO pin on the OP_D block (see the submitted picture)at the end of each scan? Attachment cfc.jpg (84 Downloads)
Testermax Posts: 159 Rating: (3)
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11/13/2009 9:23 AM	Rate (0)
CBo Gold Member Joined: 4/5/2006 Last visit: 3/5/2025 Posts: 917 Rating: (63)	Hi Testermax , i seen in picture posted that bit is Start/Stop button sequence. In this case you can use OP_TRIG and no need reset input bit because block check the edge only. But i think the problem is different: you want stop sequence if something goes wrong? the safe way to do this is check in plc everything is fine, maybe use a plc bit setted/resetet from WinCC and check changing state in plc: if no change means WinCC is not comunicaing (then take action to stop plc sequence....). This is not normal way, but only one way to detectsomething wrong occour... I think you have to check why WinCC crashed, because this one is the REAL trouble.. Regards

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11/13/2009 10:01 AM	Rate (0)
Testermax Posts: 159 Rating: (3)	Hello CBo! CBo But i think the problem is different: you want stop sequence if something goes wrong? the safe way to do this is check in plc everything is fine, maybe use a plc bit setted/resetet from WinCC and check changing state in plc: if no change means WinCC is not comunicaing (then take action to stop plc sequence....). I want to set the DO driver block=0 if I loose contact with the OS. I think that I have to do it the way you said, by creating a watchdog, checking updates on a bit from the OS. I was hoping that there were a "magic" block which I could use to solve my problem, or that there were a "best practice" but I think I`ll have to do what you suggested. This could also be used to detect communication error between AS and OS. The reason for the OS crash was error in the UPS which led to short circuit and dragged the whole circuit down
Testermax Posts: 159 Rating: (3)
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11/13/2009 4:28 PM	Rate (1)
Yer Posts: 86 Rating: (7)	Hello, If it is possible to use a named connection between OS and CPU, you can monitor this connection in the CPU. I think it isnessearly to use a CP 1613 card or a softnet licence. I have used this solution withgood result. Yer
Yer Posts: 86 Rating: (7)
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11/14/2009 12:02 AM	Rate (0)
Testermax Posts: 159 Rating: (3)	Hello Yer! Yer If it is possible to use a named connection between OS and CPU, you can monitor this connection in the CPU. I think it isnessearly to use a CP 1613 card or a softnet licence. I have used this solution withgood result. Wow thats a great tip that I will look into! Thank you very much
Testermax Posts: 159 Rating: (3)
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