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Is there any way of summarize the possible senarios/effects you can get by having a OB121 in the CPU?
Created by: JohanF at: 1/28/2011 1:03 PM (1 Replies)
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| 1/28/2011 1:03 PM | |
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Posts: 4 Rating:
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Hello dchartier I have two questions regarding OB and S7-400H. [schnippschnapp] first question can be found here What time can I expect to delay normal operation changing HWC online?. 2. To my surprise, I must have the OB121 loaded to be able to change HWC online. I´m have deliberatly not used and pointer in my program (defensive programming) in order to minimise risks. Is there any way of summarize the possible senarios/effects you can get by having a OB121 in the CPU. I have experienced motors starting and stopping in a random way having OB121 loaded, but then we used both pointers and local data without hard structure. Thank you. |
Last edited by: O_Moderator at: 1/28/2011 2:12 PMnew subject after splitting |
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| 1/28/2011 3:04 PM | |
Joined: 1/28/2009 Last visit: 9/15/2025 Posts: 6875 Rating:
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About OB121, you can check section 1.27 of following manual.You can use OB121 with evaluation codes introduced in pages 83 and 84. 1.27 Programming Error Organization Block (OB121) BR |
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