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Help!!! How to calculate moving average with S7 TIA portal V11

Created by: Jummy at: 10/22/2012 12:14 PM (3 Replies)

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10/22/2012 12:14 PM	Rate (0)
Jummy Posts: 11 Rating: (0)	Hello all, My name is Jummy and i am fairly new to the whole programming system. I need to ptogram the PLC to calculate the average of input analog datas over 10sec periods and i have no idea how to go about it. It is a voltage input, I dont know how to store the readings per seconds in a memory, tried everything i can think of. Please, help out. I hope i can do thiswith ladder logic because that is what i am using
Jummy Posts: 11 Rating: (0)
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10/22/2012 1:54 PM	Rate (0)
Jummy Posts: 11 Rating: (0)	It is a S7-1200 PLC,. Please, someone help
Jummy Posts: 11 Rating: (0)
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10/22/2012 5:45 PM	Rate (0)
fbelic Posts: 327 Rating: (28)	Greetings SCL would be a better choice for this. I don't have TIA Portal right now, but I'll try to describe the algorithm. In DB, make an array of 10 REALs. Also, make an INT counter. Create a cyclic OB than runs every second (or use clock memory to run in every second). In there, put a code that does next: Put current value in array, on counter's place and increase counter for one Add all members of array and then divide it by 10. This is probably not a best algorithm, and it will be wrong for first 10 seconds, but it is usually good enough. If you really want to do it in LAD, you could use method described in here:/tf/WW/en/Posts/31072 Best regards
fbelic Posts: 327 Rating: (28)
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10/24/2012 11:25 AM	Rate (0)
Jummy Posts: 11 Rating: (0)	Thanks very much. I will try that today. will let you know. cheers
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