4/21/2008 12:15 AM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580) |
Hello VictorFC, in the german partof the forum I have published, theI think the Parameters of the amplifiver for PT100 is not correkt and if used you get not the maximum resolution of 0,25 °C ! My suggest is, to usy 2 amplifivers to scale PT100-sensors: use 2 amplifiers connect in series after the input! For the 1st amplifier sets GAIN = 10,00 and OFFSET = 0 and for the 2nd amplifier sets GAIN = 2,5 and OFFSET = -5000 with 2 decimal places. This order and parameter selection is urgent because rounding errors occur normally again although also other possibilities would be mathematically correct! At the analog output (of the 2nd amplifier) values are (LOGO!-intern)then between -5000 and 20000 (Interpretation: -50,00 °C to 200,00 °C), so that the full solution (with correct values after the comma of: nnn,00; nnn,25; nnn,50; nnn,75) is been useful! Mean values: If you only want to calculate (A3 + A4) / 2 as mean value, then use the block "komparator" with Ax = a3 and Ay = - A4 (use a amplifiver with Gain = -1 before connect with the komparator pin). for a minimale rounding error use then a multiplexer to get the result of the komparator ant connect a amplifiver to it with GAIN = 0,5. The output is the mean value. But if you want to calculate the mean values of one or more single analog value(s), then look at my programs at Filters (like bessel or butterworth) At the attachment you can find some newer versions of my program parts to memory analog values and calculate the mean value of the memoried values (they needs not so many blocks)....... If you have questions, then ask me here. Best regards Betel AttachmentFORUM_mean_values.zip (926 Downloads) |
==> Meine TAG-Listen: "deut." |
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4/23/2012 5:34 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)
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Hello, The article Mittelwert (mean value) in the german forum part ask for a äquivalent solution (for the LOGO!-0BA7). Perhaps it is interest for you, too - look at the attachment here... Best regards Betel AttachmentDemo_Mittelwert_aus_2_Analogeingängen (0BA7).zip (736 Downloads) |
==> Meine TAG-Listen: "deut." |
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