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Lost communication or what?

Created by: dzikuss at: 9/3/2019 8:30 AM (6 Replies)

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9/3/2019 8:30 AM	Rate (0)
dzikuss Regular Member Joined: 9/27/2017 Last visit: 5/30/2024 Posts: 16 Rating: (0)	Hallo, everyone! Today I noticed, that for some reason tags, that are normaly closed, has value changes from 1, to 0. Dont know how to explain, but for very short time they changes bythemselves. (Please see attachment). Than I look forward: When I look " plc online" I can see that all the left side, which normaly is green disappears for some very short period. These periods are not regular. What should I check or look for? Tnx Attachment SiemensS71200.png (119 Downloads)

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9/3/2019 8:48 AM	Rate (0)
Duris_I Diamond Member Joined: 4/28/2015 Last visit: 4/19/2025 Posts: 10876 Rating: (836)	Hello, sry, not clear info. It's situation that right side is indicating on some Tags Green color at same time? Simply your problem can be f.ex. in case of some Subroutine which run only on some condition, therefore can be inactive on some time. Is this Subroutine or main block? Pls consider give us more infos, alone picture isn't enough in my opinion...
	With best regards... Ivan Duris Flight: OMICO
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9/3/2019 8:54 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 4/22/2025 Posts: 4520 Rating: (843)	dzikuss Hallo, everyone! Today I noticed, that for some reason tags, that are normaly closed, has value changes from 1, to 0. Dont know how to explain, but for very short time they changes bythemselves. (Please see attachment). Than I look forward: When I look " plc online" I can see that all the left side, which normaly is green disappears for some very short period. These periods are not regular. What should I check or look for? Tnx Hello, It seems that during this short time, the block you are tring to monitor was not called. Once it has been called, the power rail in the left hand side became active.
	Ayman Elotaify
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9/3/2019 9:05 AM	Rate (0)
dzikuss Regular Member Joined: 9/27/2017 Last visit: 5/30/2024 Posts: 16 Rating: (0)	The problem is that the power line on the left side is not active for very short period. And it goes like a cycle. The power goes on and off all the time, but the periods are not equall.

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9/3/2019 9:24 AM	Rate (0)
Duris_I Diamond Member Joined: 4/28/2015 Last visit: 4/19/2025 Posts: 10876 Rating: (836)	Hello, sry again, pls answer that questions to go further...
	With best regards... Ivan Duris Flight: OMICO
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9/6/2019 12:12 PM	Rate (0)
crisdonate Advanced Member Joined: 5/17/2018 Last visit: 2/28/2025 Posts: 26 Rating: (1)	Hi, Is the block OB1 or is any FC/FB? Where do you call the block from? It will not be cause of fault but... Have you tried to simplify output Reset M131.4 in one line instead 2 lines ? Thanks,
	Last edited by: crisdonate at: 09/06/2019 12:14:03
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9/10/2019 12:15 PM	Rate (0)
NastasaM Bronze Member Joined: 4/4/2011 Last visit: 3/28/2025 Posts: 65 Rating: (11)	Hello! There are few details, so I can only make assumptions. Maybe it will help you. First of all, this network is in OB1 or in some FC or FB that you call somewhere? If this is an FC or FB please check how it is called. Usually this behavior occurs when you did not called the FC/FB so the PLC does not execute it. If it is called, please take a look if there is something on the EN line that might prevent it from calling (even for short period). I have seen a few software made in this manner. I personally think is not so good but this is another matter. Hope it helps. Mihai.
	Learn, unlearn, relearn...
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