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Determine weight increase

Created by: wyliemike at: 1/17/2011 2:34 PM (3 Replies)

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1/17/2011 2:34 PM	Rate (0)
wyliemike Posts: 8 Rating: (0)	I'm look for some S7 code that will check if the weight on a scale is incrementing and then generate an alarm if the weight is not increasing
wyliemike Posts: 8 Rating: (0)
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1/17/2011 3:42 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	For example such code in OB34 would be called once per second: L "last_value" //MD20 for example L #scale_input >R = Alarm BEC // optional T "last_value"
Aret Posts: 2348 Rating: (265)	Last edited by: Aret at: 1/17/2011 3:43 PM
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1/18/2011 8:35 AM	Rate (0)
wyliemike Posts: 8 Rating: (0)	Many thanks for your reply. I don't wish to seem so dim but could you simplify your suggestion please as I'm only a beginner at programming?
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1/18/2011 4:53 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Well algo is: read weight compare it with value on previous call If 1st is greater - everything is ok - weight is growing, if not - you set some alarm bit (ex.Q0.0 or M123.4) That what code above does. But input can react on some influence (EMC for example) and produce value drop, so simplest way to avoid it - make these checks for distant in time. If you place this code in OB3x it would be called cyclically, for ex.OB35 is called every 100ms, OB32 every second and so on. Actually i would advice to read getting started guides on S7 programming or visit special trainning (it would spare a lot of time to you:^))
Aret Posts: 2348 Rating: (265)
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