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Old August 9th, 2018, 09:04 AM   #1
Combo
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WinCC connection to S7-300 fail

Hi,

I have a PC with WinCC 7.4 and a PLC 315-2DP with 343-1 card. I cannot get connection to the PLC in the tag management while settings of the ethernet driver seem right...

Any idea what I overlooked ?

Thanks in advance,

IMG_20180809_114641_resized_20180809_020025807.jpg

IMG_20180809_114651_resized_20180809_020023949.jpg

IMG_20180809_114700_resized_20180809_020024970.jpg

IMG_20180809_114704_resized_20180809_020023008.jpg

Kind regards,
Combo
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Old August 9th, 2018, 09:53 AM   #2
mk42
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I can't see your attachments, not sure why
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Old August 20th, 2018, 03:44 AM   #3
Combo
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WinCC

Hi,

Don't know why the attachements were not shown, but I got it online...
I think that placing an IO Field on a screen that requires updating did the connection, is that possible ? So a long you don't ask a tag, the connection could remain in 'not connected' status I think. I'm not sure about this, but that's the impression I got..

Kind regards,
Combo

Quote:
Originally Posted by mk42 View Post
I can't see your attachments, not sure why
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Old August 20th, 2018, 11:30 AM   #4
mk42
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Quote:
Originally Posted by Combo View Post
Hi,

Don't know why the attachements were not shown, but I got it online...
I think that placing an IO Field on a screen that requires updating did the connection, is that possible ? So a long you don't ask a tag, the connection could remain in 'not connected' status I think. I'm not sure about this, but that's the impression I got..

Kind regards,
Combo
Sounds plausible, at the very least. I know WinCC tries to minimize tag access as possible, managing unused connections seems the next logical step.
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Old August 21st, 2018, 05:59 AM   #5
travispedley
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Not sure about WinCC, but in WinCCFlex/TIA I usually just browse for a tag in the plc and drag it over, this creates the connection for me.
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Old August 21st, 2018, 03:49 PM   #6
Thomas_v2
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Quote:
Originally Posted by Combo View Post
So a long you don't ask a tag, the connection could remain in 'not connected' status I think. I'm not sure about this, but that's the impression I got..
I can say for WinCC 7.3 that WinCC connects to the PLC at runtime start and holds the connection open, even if there is no tag under this connection.
At least it subscribes always to mode transition events like run/stop/warmstart in the PLC.
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