6/29/2023 3:24 AM | |
Joined: 8/27/2021 Last visit: 7/7/2023 Posts: 7 Rating:
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Hi, my LOGO performs a rare ripple when plotting the AI. The relays act according to that variations It happens in the four AI I'm using. The thing is: with a stady input voltage, AI in Logo behaves showing strong variations, that alter the relays, opening and closing repeteadly. Mine is a : 6ED1052-1MD08-0BA1 Logo 12/24RCE FW 1.83.02 I attached videos showing the effect specifically in AI1, where I programmed a way to diminish the ripple. Atached the program too. Does anybody know what is it about? Thanks in advance Martin
AttachmentFiles.zip (237 Downloads) |
Martin Frattini |
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6/29/2023 4:24 AM | |
Joined: 8/27/2021 Last visit: 7/7/2023 Posts: 7 Rating:
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Hi again, I put the right Logo model. For the second point: I measure 4 temperatures to manage a heating project. I built 4 transducers to use 4 cheap PT100 sensors using operational amplifiers, to obtain Voltage between 1V and almost 10V. Those simple circuits doesn't allow me to have a good zero. Additionally I cant calibrate the slope neither. This is the reason for the rare calibration values you found in the analog amplifier. I attach the 4 calibration tables. There I took melting ice, boiling water and my own body to check it!! Enough accurate and enough measuring range for a heating project. The range of values starts from about 1V and will never reach 10V. The sensors use separate power supplies. 2 sensor circuits for each source. You can see a small black block at the right side of the picture. AttachmentPT100 to 0-10 V.zip (375 Downloads) |
Martin Frattini |
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