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Time Lag Function required

2/20/2012 4:34 AM	Rate (0)
HBB Posts: 6 Rating: (0)	Dear All , I was working on a project in which i have to replicate some logic from other systems to Simatic Step 7. I came across a fuction which has characteristics as shown in attachements. The fuction name is primary time delay . Does any body know similar function in Step 7 ? Thanks in advance HBB Attachment time_lag.GIF (1069 Downloads)
HBB Posts: 6 Rating: (0)
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2/20/2012 6:46 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Well, usually it's described by formula Output := kInput + (1-k)previous_output, k is from 0 to 1 (can be bound with Lag Time) - specifies how inertial output is.
Aret Posts: 2348 Rating: (265)
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2/20/2012 5:08 PM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/25/2025 Posts: 6885 Rating: (1368)	HBB Dear All , I was working on a project in which i have to replicate some logic from other systems to Simatic Step 7. I came across a fuction which has characteristics as shown in attachements. The fuction name is primary time delay . Does any body know similar function in Step 7 ? Thanks in advance HBB Dear HBB, Check section 2-1-9 of the following manual. "LAG1ST" is the first order lag element which its response resmbles your required characteristic curve.This function is part of "Modular PID control" optional package. http://support.automation.siemens.com/WW/view/en/1137082 See the attachment. Best regards, Hamid Hosseini Attachment 1.pdf (745 Downloads)
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2/21/2012 12:27 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/19/2025 Posts: 3052 Rating: (1062)	Hello HBB apart from programming one yourself or buying the Modular PID package, you can also get a free of charge one from the link below: Software low-pass filter in STEP 7 V5.x Providing you have SCL, www.oscat.de also has an impressive free of charge library of S7 blocks including various Filter Blocks which may interest you (go straight to http://www.oscat.de/downloadmanager.htmlwhich is in english). I hope this helps
	Last edited by: fritz at: 2/21/2012 12:30 AM Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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2/22/2012 6:32 AM	Rate (0)
HBB Posts: 6 Rating: (0)	fritz Hello HBB apart from programming one yourself or buying the Modular PID package, you can also get a free of charge one from the link below: Software low-pass filter in STEP 7 V5.x Providing you have SCL, www.oscat.de also has an impressive free of charge library of S7 blocks including various Filter Blocks which may interest you (go straight to http://www.oscat.de/downloadmanager.htmlwhich is in english). I hope this helps Thank you Fritz. Filter soved my problem ...! Regards HBB
HBB Posts: 6 Rating: (0)
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This contribution was helpful to 2 thankful Users fritz O_Moderator

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