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CPU-315-2DP stops when IM361 looses power

Created by: R.GH.B. at: 1/22/2011 9:22 AM (8 Replies)

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1/22/2011 9:22 AM	Rate (0)
R.GH.B. Posts: 5 Rating: (0)	Hello Everyone. I have a project with 3 racks (CPU-315-2DP and IM360 on centeral rack and IM361 on extension racks). There are 3 independent processes to control so each rack holds the I/Os of one process. Here is the problem: I used a separate circuit breaker to supply each rack. When I power on or off any of extension racks, CPU goes to STOP mode. I checked Diagnostic Buffer, it says something about module sychronization error (I do not remember the message precisely). I have already added OB122 (module access error) and OB82( I/O_FLT1) but it does not prevent CPU from stopping in this situation. Is there any solution? Since the process on each rack is indepedent from others, I don't want the CPU stops when I power off the extension racks. any help will be appretiated.
R.GH.B. Posts: 5 Rating: (0)
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1/22/2011 9:39 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)	Dear member check if you have OB86 in your CPU. regards Attachment OB86.pdf (143 Downloads)
	Demo Channel on Youtube
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1/23/2011 5:50 PM	Rate (0)
R.GH.B. Posts: 5 Rating: (0)	sorry for delayed response. Thank you very much hdhosseini. I'll check to see if this solves the problem.
R.GH.B. Posts: 5 Rating: (0)
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1/24/2011 8:19 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating: (1181)	Perhaps would be useful - Which organization blocks do you have to load into the CPU to ensure that the CPU does not go into the "STOP" status when a remote I/O fails? Best regards, Hristo Mihalev

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1/27/2011 8:08 PM	Rate (0)
R.GH.B. Posts: 5 Rating: (0)	well, I added OB86 and I still have the problem. Here is what in Diagnostic Buffer. Any other ideas? Attachment IMAG0057.jpg (130 Downloads)
R.GH.B. Posts: 5 Rating: (0)
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1/27/2011 8:26 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	quote from the ob86 pdf: Failure of a central expansion unit (not with S7-300) is detected. So what i understand is that the 300 does not not call OB 86 in this case and will go to stop. The fact that in the hardware diagnostic picture is no message of a missing OB or so is pointing to that also.
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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1/29/2011 7:14 AM	Rate (0)
R.GH.B. Posts: 5 Rating: (0)	Yes. you're right. I've noticed that there is no reference to any OB in the message of CPU in Diagnostic Buffer. Does it mean that there is no way to prevent this issue? I think,it'll be wiser to use ET200 interface modules for my future projects insteed of IM360/IM361
R.GH.B. Posts: 5 Rating: (0)
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1/29/2011 8:03 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)	Hi R.GH.B. Check following link for a similar problem: Problem with Profibus I have now the same problem.I am using 315-2dp and et200m(IM153).And all of them have the same led status and giving sf and flashing bf.Diagnostic buffer is giving the following error: Event 1 of 100: Event ID 16# 5371 Distributed I/Os: end of the synchronization with a DP master Slot of the DP master: 2 Number of distributed stations: 0 Incoming event BR
	Demo Channel on Youtube
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1/31/2011 1:13 PM	Rate (0)
R.GH.B. Posts: 5 Rating: (0)	thanks for the link. The event message was the same but the issue was a different one. In my case every thing works fine with no error LEDs or events. The problem comes up when (for any reason) I power off one of the extension racks - CPU goes to STOP mode- then if I change the Mode switch on CPU from RUN to STOP and again to RUN, CPU stays in RUN mode and program runs for the centeral rack and the other extension rack. Now, when I power on that extension rack, CPU stops again and I have to change the switch from RUN to STOP to RUN once more. In brief, I don't want the power failure on any extension rack causes CPU stop.
R.GH.B. Posts: 5 Rating: (0)
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