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WinCC OPC Client is not reacting to fast trigger of points

Created by: kee at: 11/13/2006 9:17 AM (7 Replies)

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11/13/2006 9:17 AM	Rate (0)
kee Advanced Member Joined: 5/24/2006 Last visit: 11/14/2007 Posts: 93 Rating: (4)	Hi All, I'm using OPC.chn (OPC DA Client) connected to an third party OPC DA Server. When fast toggering of binary input are not able to recognise(captured) by WinCC. Is there anywhere I could configure and set the OPC.chn parameters? My project needs to detect fast information. btw, My OPC DA Server is configured quence buffer (per tag) as 50, and min interval as 20ms. K

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11/13/2006 11:30 AM	Rate (0)
Ikkezelf Posts: 1084 Rating: (72)	Hi, The fastest update is 250 ms (on change). In my opinion you can therfore mis updates if they occur within 250 ms. For the S7 channel it's different, cause you can there use the on event change, which means it's triggered from the plc. I don't know of any solution for this. (please correct me if I'm wrong, or when you think you have a solution). with regards, Ikkezelf
Ikkezelf Posts: 1084 Rating: (72)
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11/14/2006 10:22 AM	Rate (0)
kee Advanced Member Joined: 5/24/2006 Last visit: 11/14/2007 Posts: 93 Rating: (4)	Hi ikkezelf, Is the "uponchange" trigger is much fast/sensitive to the "250ms"? I understand that "250ms" trigger can be set on the graphic (e.g: Sq box), but how does the "250ms" scan related to the alarm logging? getting blur....[:blush:] k

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11/14/2006 10:46 AM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (150)	Hi K Again, a common misconception [:D] "Upon Change" should only be used if the PLC can send the data to WinCC. This is different from WinCC polling the PLC for data.I believe only S7-400's can do this (of course there may be others). So a general guideline is : - always use Upon Change for internal tags - never use Upon Change for external tags Finally I believe that the alarm logging system cannot poll faster than 500ms. Salma We dance in a circle and suppose,while the secret sits in the middle and knows

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11/14/2006 11:17 AM	Rate (0)
Ikkezelf Posts: 1084 Rating: (72)	Alarm logging update speed can be set in the registry if I'm not mistaken. But please be carefull when fumbling around with the registry (always create a backup first.) And I would not change the update speed of the alarm logging, cause it's not supported. For my projects I use S7-400 plcs with the upon change setting for the external tags. with regards, Ikkezelf
Ikkezelf Posts: 1084 Rating: (72)
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11/14/2006 12:17 PM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (150)	That's true you can change it but it's not recommended. For further information see this FAQ : How can you change the acquisition cycle of the Alarm Logging? Salma We dance in a circle and suppose,while the secret sits in the middle and knows

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11/16/2006 5:33 PM	Rate (1)
kee Advanced Member Joined: 5/24/2006 Last visit: 11/14/2007 Posts: 93 Rating: (4)	Hi guys, Problem solved! The problem was caused by the configuration of OPC Server. Some OPC server needs to configure the point (tag) as event quening, once this feature is enable, Client will automatically able to receive the sequence of Q-up tags... Thanks guys! K

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11/20/2006 9:19 AM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (150)	Thanks for the update kee. Glad to hear it's working [:D] Salma We dance in a circle and suppose,while the secret sits in the middle and knows

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