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URGENT HELP--ERROR LED BLINKING

Created by: vipz at: 1/2/2013 4:43 PM (9 Replies)

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1/2/2013 4:43 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear all, Am facing some problem with 1215 ac/dc/rly type cpu with FW 3.0. In my system, am communicating with CNC machine using PN-PN coupler. 16 byted of date are configured to send and recieve , address starts from 2. I am able to establish the communication and transfer the data. My problem is that, whenever power restarts the cpu, error led is blinking ( all other are healthy-- pn-pn coupler not showinfg any fault), but am able to transfer the data from both the side even the error exists. If i download the hardware configuration again, it become ok.till next power restarts.. The diagnostic buffer showing "New I/O access error during process image update /n input 2 (16 Bytes) will temporarily not be updated as part of the updating of process image 0 " . Please see the attached file for diagnostic buffer entry. please suggest to avoid this problem Thanks n regards Vipz Attachment Diagnostics.pdf (213 Downloads)
	With Best Regards VIPZ
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1/2/2013 5:18 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 11/11/2024 Posts: 15388 Rating: (2443)	How long does the error led remain blinking? Do you have any logic in the plc that reads or writes any PN data before it is actually online and available for reading/writing? Take a look at the attached settings for a recent project that uses what I think of as default settings for my s7-1200 projects. If you are not looking for the remote device to be online before attempting to read/write in your plc logic, you should expect some errors. If the device adheres to PN standards and provides diagnostic data, you should be able to get diag data from the remote device using ModuleStatesor DeviceStatesinstructions. After some testing, you should be able to see when the field device goes online, see which diagnostic bit toggles, and use that prior to accessing the process image data for that device. You can put all calls that access the remote device in an FB or FC and update an internal DB or M tag for use within the plc logic. In this way, you can only access the field device data when it is actually available. If none of this is useful, try the Support Requestoption. Attachment Portal_DistrIO_Settings.zip (193 Downloads)
	science guy
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1/2/2013 6:34 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear Huggy, there is no logic written apart from move blocks.. also no condition is assigned for calling the move block. That may be the reason ??? Regards Vipz Attachment pn pn.jpg (163 Downloads)
	Last edited by: vipz at: 1/2/2013 6:46 PM PLEASE SEE THE ATTACHED IMAGE FILE With Best Regards VIPZ
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1/2/2013 6:48 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 11/11/2024 Posts: 15388 Rating: (2443)	If you create the appropriate hardware and diagnostic error OBs, you can get the plc to stay in run while it waits for the remote io to become available. Until it is available, you will get diag buffer entries for each scan of the plc before it goes into stop mode. You will want to ensure the device(s) available before accessing the address. The modulestates block can help you determine the module is available, then you can call an FB/FC to perform those move instructions. When the remote device is offline, you can simply do no other logic other than wait, or you can perform other tasks not related to the remove device. If you find the remote device drops offline for short periods of time and your process can tolerate it, you might consider how that would affect your logic as well since you would not want to force your system to halt unnecessarily. Note, short period of time might be 100 ms to maybe 2 seconds. Set your profinet configuration up accordingly so it does not generate a fault for lack of cyclic data for short periods of time. Look at my prior post for an example.
	science guy
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1/2/2013 6:59 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear Huggy, if communication error happens, PN-PN coupler should show BF indication na?? It stabilise quickly, but cpu did not.. I have seen your last attached doc, my pjct doc also attached, please see and suggest. If possible, i wanted to rectify this issue tomorrow itself.. thanks for your quick response Vipz
	With Best Regards VIPZ
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1/3/2013 6:41 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear Huggy, more updates.. 1. Today i have observed the sustem by bypassing the logic used for communication, still the problem was happening. 2. After that for a trial, made cnc machine on first, after it stabilised, made plc on. At that time, there was no error. So temporerly i have added a hardware timer to control power supply to plc, working good. But couldnt able to find the actual remody..I have assigned call OB85 option also.. thanks and regards Vipz
	With Best Regards VIPZ
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1/3/2013 6:58 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 11/11/2024 Posts: 15388 Rating: (2443)	Does the plc program logic have a hardware interrupt OB? That should run in the event a piece of configured hardware throws a hardware error. Also, how long does your system wait for the remote io to come online?
	science guy
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1/4/2013 7:05 AM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear Huggy, There is no interupts configured in the project. If need to configure?can you just guide me how to do that?? Also,up to till next download, the cpu shows error led blinking..( CPU IN RUN MODE ONLY, CAN ABLE TO TRANSFER THE DATA IN ERROR MODE ALSO ) Regards Vipz
	With Best Regards VIPZ
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1/8/2013 11:41 AM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear all, please suggest some idea Regards Vipz
	With Best Regards VIPZ
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1/8/2013 3:17 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 11/11/2024 Posts: 15388 Rating: (2443)	The online help with the portal is pretty decent and describes how to create OBs, how to set attributes, and what the varous OB types do. If you look in the search and index areas you can quickly find answers to the hardware diagnostic routine OB questions as well as how to dig deeper. As to the buffer filling with entries, if the plc is configured to only access the remote / distributed IO addresses when they are active / online (by putting the move blocks in an FB or FC), then the buffer entries will be more limited. I recently discovered this approach for similar reasons during development without the actual hardware connected & powered up. In fact, they are disconnected and my desktop s7-1215 plc has error led blinking right now! It'smissing the profibus master module, and a 16DI/16DO module as well as an S-120 profinet drive, and it is running fine alerting me via the hmi those devices are offline.
	science guy
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