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Read the right analog values

Created by: Drogen at: 11/2/2009 8:44 AM (8 Replies)

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11/2/2009 8:44 AM	Rate (0)
Drogen Posts: 21 Rating: (0)	I have a problem that probably is more about understanding than an actual error. I have an application with two PT100 sensors that controls a motor valve in a solar heating system for a swimming pool (which you might have seen in some other threads)... When I run the application in “online test” I can read the value of about 230 to 270 on the two AI-inputs for my PT100 sensors. I also log all my values with Excel LogoLogger (thanks who made that nice little thing) and it works like a charm but the values on AI3 and AI4 (my PT100 inputs) says about 230 to 270 there as well. How do I read out the actual temperature that should be around 5-10 degrees Celsius at this time? When I click on the “goggles” over the block for temperature in online test I see a number that I think corresponds better to the real temperature. Is there a way to log or read this in another way? Or can I scale this in Excel somehow to get the right graph?
Drogen Posts: 21 Rating: (0)
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11/2/2009 1:02 PM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Hi! You should use an amplifier. Have a look at the attached file. In simulation mode you will see 2 values for the input. One -50~200 (the real temperature) and one 0-1000 (the input value). I thing this is a peculiarity of the software. Maybe it would be better to ignore this. Focus on the message text. Attachment PT100 Temperature Value.zip (568 Downloads)
	Last edited by: miltos at: 11/2/2009 2:29 PM Last edited by: miltos at: 11/2/2009 1:12 PM
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11/2/2009 6:33 PM	Rate (0)
Drogen Posts: 21 Rating: (0)	Thanks for the replay. I use an analog comparator set to “PT100” doesn’t that works like an amplifier? Should I use another amplifier in serial with the original? I’m not sure I understand anyway. I have searched in the forum for “scaling PT100” I don’t find anything of value. I have attached my version of the file. If you have time to take a look I would appreciate it. Attachment version5a.zip (477 Downloads)
Drogen Posts: 21 Rating: (0)
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11/2/2009 6:54 PM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	I don't know the way you can log data. Which variable do you log? Is it possible to log the outputs of B017 and B018 of the attached file? Attachment version5a___.zip (530 Downloads)

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11/2/2009 8:37 PM	Rate (0)
Drogen Posts: 21 Rating: (0)	I'm using an Excel file from this forum to log the status of all inputs and outputs. I don't think it is possible to log any individual block.
Drogen Posts: 21 Rating: (0)
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11/2/2009 9:00 PM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Drogen I don't think it is possible to log any individual block. I suppose you can scale analog inputs in excell. Try to multiply input's value with 0.25 and abstract 50. That is: "Temperature in degrees Celcius" = "Analog Input" * 0.25 - 50

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11/3/2009 6:22 AM	Rate (0)
Drogen Posts: 21 Rating: (0)	Thank you, that works fine. I guess i could use an analog math bloch, and an analog output just in the software to get the values to an output that is possible to log. Tanks for your time!
Drogen Posts: 21 Rating: (0)
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11/3/2009 9:01 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Yes, you could do that!
	Last edited by: miltos at: 11/3/2009 9:01 AM
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11/3/2009 11:28 AM	Rate (1)
Fux Posts: 661 Rating: (123)	The logger is not able to show actual values of functions. It can only show the state ofinputs, outputs, flags, shift register bits. So if you are interested in actual values -> convert them into analog values (e.g. with MUX). You could also scale the analog value with logo instead of excel (you have to do this anyway to be able to display/evaluate the values in logo). For this use e.g. an analog amplifier. Then connect the output of the amplifier with an analog flag. -> The excel logger is also able to handle analog flags. That´s it.
Fux Posts: 661 Rating: (123)
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