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IOT2040 with IO Shield - gpio38 and 40 disappears (DQ0&DQ1 stops working)

Created by: AutoGen_6787725 at: 7/28/2021 10:33 PM (5 Replies)

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7/28/2021 10:33 PM	Rate (0)
AutoGen_6787725 Posts: 3 Rating: (0)	I am using a SIMATIC IOT2040 with IOSHIELD 6ES76470KA010AA2 Example Image V3.1.1 (Node-RED v1.2.1; node-red-node-intel-gpio v1.0.0-iot2000) I have two flows in NodeRED, one is pushing analog values to Mindsphere with mindconnect lib agent, the other just toggles DQ0 and DQ1 with delays. My problem is that sporadically the digital outputs stop working, mostly after redeploy in Node-RED but sometimes happened after running without any issue for minutes. the gpio38 and gpio40 folders disappear from /sys/class/gpio/ var/log/messages shows: Jul 28 14:35:57 iot2000 local1.err libmraa[310]: gpio40: write: Failed to write to 'value': No such device Jul 28 14:35:57 iot2000 local1.err libmraa[310]: gpio38: write: Failed to write to 'value': No such device Redeploying in Node-RED fixes this issue but that is not an acceptable solution. I could not figure out a specific sequence to reproduce it but it happenes every day when I use the NodeRED UI to make some changes, click around and execute some commands in linux. Thanks in advance for any help. Attachment flows.txt (422 Downloads)
AutoGen_6787725 Posts: 3 Rating: (0)	Last edited by: AutoGen_6787725 at: 07/28/2021 22:34:57 Last edited by: Jen_Moderator at: 07/29/2021 08:23:23 Edited text for better reading.
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7/30/2021 1:32 PM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Hi, never heard of such a problem. I will test your flow and check whether I can reproduce that. Is it also displayed in node-red that the outputs are not working or only in the Linux logs and of course cheking it on connected devices to those outputs? Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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7/30/2021 1:43 PM	Rate (0)
AutoGen_6787725 Posts: 3 Rating: (0)	bergmanu Hi, never heard of such a problem. I will test your flow and check whether I can reproduce that. Is it also displayed in node-red that the outputs are not working or only in the Linux logs and of course cheking it on connected devices to those outputs? Best regards! Node-red does not give me any error in logs or on the UI. I have a PLC connected to the IO Shield so i can see the digital outputs values and they mostly stuck on value=1 (that is the default initial value set in node-red). When you try to reproduce i please to create another flow and push values (every minute) with mindconnect lib, this makes the CPU usage quite high, maybe that contributes to this issue.
AutoGen_6787725 Posts: 3 Rating: (0)
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8/2/2021 4:08 PM	Rate (0)
Fe_lipe Silver Member Joined: 12/12/2016 Last visit: 4/8/2024 Posts: 640 Rating: (60)	Hello, I was able to reproduce your issue even without further CPU load. But after testing with a delay of 2 seconds in the off-timer, it seems more "stable" and I didn't have any issues again. Could you please give it a try? I added the flow into the attachment. BR Attachment flows (9).zip (436 Downloads)

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8/2/2021 6:01 PM	Rate (0)
AutoGen_6787725 Posts: 3 Rating: (0)	Fe_lipe Hello, I was able to reproduce your issue even without further CPU load. But after testing with a delay of 2 seconds in the off-timer, it seems more "stable" and I didn't have any issues again. Could you please give it a try? I added the flow into the attachment. BR I changed them to 2 sec then deploy -> DQ0 and DQ1 were gone. Increasing timers could be a workaround but definitely not a solution to the problem.
AutoGen_6787725 Posts: 3 Rating: (0)
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8/4/2021 8:46 AM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Hi, are you familiar with building images from github? If so, you can build the branch jan/mraa-node-gpio-update, which should contain a fix for this issue. To be 100% sure I would need to test this as well, but the next days this is not possible. Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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