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Event execution priorities and queuing ob`s numbers
Created by: boazeventall at: 4/11/2012 11:10 AM (3 Replies)
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| 4/11/2012 11:10 AM | |
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Posts: 131 Rating:
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i have read about that obs are executed in queuing i dont understand if i have several ob like: ob1,ob20,ob5,ob2,ob40 in what order they will executed? |
| 4/11/2012 11:54 AM | |
Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating:
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Hello , Please refer to the following manual (chapter1) for more information on OBs. System Software for S7-300/400 System and Standard Functions Volume 1 and Volume 2 Best regards, Hamid Hosseini |
| 4/11/2012 12:12 PM | |
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Posts: 131 Rating:
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i have read it but i still dont understand.. i need an example :) |
| 4/11/2012 12:37 PM | |
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Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating:
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Hello again, OBs are interfaces between user program and operating system of S7 CPUs.They are categorized due their tasks and importance (priority).You have option of writing your codes to detemine your system reaction in case of OB call.For example in case of "OB86", it is called when extension rack or DP slave fails or return.You can write in OB86 to diagnose or determine failed station or do not include OB86 to CPU in case of error.  OB86.zip An example of OB81 is mentioned below (attachment): Which organization blocks do you need for error handling? Best regards, Hamid Hosseini AttachmentOB81.zip (101 Downloads) |
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