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Analog Threshold Trigger - Retentivity of hysteresis

9/16/2025 7:28 PM	Rate (0)
tneraul Regular Member Joined: 7/4/2019 Last visit: 9/16/2025 Posts: 8 Rating: (0)	Hello, I am not new in the PLC world but I am new with a project with a LOGO 8.3. Everytime I restart the CPU or power-up the LOGO, the pump is running until it reach the OFF condition. Ex: Pump start at 41 psi and stop at 63 psi but if the pressure is in between it will start the pump on CPU restart. Is there a way to make the analog threshold trigger remember its hysteresis or ignore the first trigger if the value is in between? Attachment 2025-09-16 15_27_56-LOGO!Soft Comfort.png (6 Downloads)
	Last edited by: tneraul at: 09/16/2025 19:34:17
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9/17/2025 1:06 AM	Rate (0)
PADRE PIO Member Joined: 4/11/2022 Last visit: 9/17/2025 Posts: 92 Rating: (7)	Hi mate, Find attached an example to try to solve your problem. Considerations: My pump turns on between 200 till 400 (just for a test); In order to make it possible, I inserted an extra input to be a manual reset, and after that, your program can run in normal condictions; To test, use the simulation mode by pressing F3 key. Please let me know if it was useful or not. Take care! Attachment Example1.zip (1 Downloads)
	Rgds, Padre Pio Automation
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9/17/2025 3:52 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/17/2025 Posts: 35967 Rating: (4503)	Try this ...

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