9/17/2011 9:24 PM | |
Posts: 103 Rating: (0) |
hello sir , as u told i changed set point and also bypassed the algorithm by putting it to manual mode and set manual value but still there is no change in error and lmn value, as i told u earlier when i simulate this program in plcsim the error and lmn value changes but not with plc i m having the error when i run it "area length error when reading" i m also attaching the diagnostic buffer information pls have look on it thanks AttachmentDiagnose.zip (148 Downloads) |
10/23/2011 7:35 PM | |
Joined: 1/28/2009 Last visit: 8/5/2024 Posts: 6844 Rating: (1365)
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Dear veer Please check binary status of COM_RST in FB41 and the attachment as a sample variable table.Note, if this variable is activated ,algorithm is totally bypassed .No error calculation and no LMN generation! Best regards |
10/24/2011 6:24 AM | |
Joined: 10/7/2005 Last visit: 8/6/2024 Posts: 3016 Rating: (1054)
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Hello veer all I can offer is a couple questions: 1.) You did download (S)FB41's IDB, didn't you? 2.) Are you using FB41 or SFB41? The Compact CPU's have SFB41 inbuilt which would be more efficient to use (I believe FB41 should work in your 313-C CPU too, I haven;ttried it though and it would be wasteful to use it). Chapter 7 of the SIMATIC S7-300 CPU 31xC Technological Functions has more on SFB41? I hope this helps |
Cheers |
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