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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 (9 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 (3 Downloads)
	Rgds, Padre Pio Automation
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This contribution was helpful to 1 thankful Users Moderator_Lan

9/17/2025 3:52 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/17/2025 Posts: 35972 Rating: (4503)	Try this ...

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This contribution was helpful to 1 thankful Users Moderator_Lan

9/17/2025 2:28 PM	Rate (0)
Quirin Bronze Member Joined: 12/19/2019 Last visit: 9/17/2025 Posts: 457 Rating: (54)	Try it this way. If the value is at the minimum, it will be turned on upon restart. If the value is in the neutral range, it will not be turned on upon restart. Attachment Hysteresis on restart.zip (0 Downloads)

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