1/18/2023 8:36 AM | |
Joined: 1/13/2023 Last visit: 1/19/2023 Posts: 3 Rating:
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Hallo. I want to count pulses from a flow meter (HRI-Mei B6) Each puls are 6ms and one pulse are 10L and convert the pulse to a >20ms longer pulse . My project is that the pulses from the flow meter are to controll a dosage pump via the fast inputs (i3-i8) on the siemens LOGO! The pump only allows a minumum contact duration for >20ms so the pulse (I think) from the flow meter are to short. So I wondering if some one can help me with a program, I have treid but my programing skills are limited so I´m stuck. I also wondering If there are sombody that can tell me how to conect the pulse meter to the LOGO! Best regards /Mikael AttachmentHRI-Mei B6.pdf (657 Downloads) |
1/18/2023 2:12 PM | |
Joined: 2/22/2008 Last visit: 8/6/2024 Posts: 2698 Rating:
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If I have understood correctly, the frequency is not converted, but only the pulse duration is extended. See the LOGO program and connection diagram in the appendix for a possible solution. The program only can work correctly, if the time between 2 pulses is greater than 20ms. Version 1 needs additionally a cylce time greater than 6ms, but this is in most cases no problem. Version 2 buffers the pulse and generates a pulse as long as you want. Regards, Scorp AttachmentImpulse converter.zip (539 Downloads) |
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1/18/2023 8:26 PM | |
Joined: 1/13/2023 Last visit: 1/19/2023 Posts: 3 Rating:
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Thank you for helping me. I have read about my pulse meter and it use the NAMUR standard (What is a NAMUR Sensor? - intrinsically safe sensor - RealPars) and the signal seems to be a analog signal that use a small current flow insted of switching cirquit that I first thought. So I have to rethink about this project. Any ideas how to work this thing out? |
1/19/2023 7:06 AM | |
Joined: 1/13/2023 Last visit: 1/19/2023 Posts: 3 Rating:
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Hallo I have scan the documentatiom that was included to the flow meter. Thank you |
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