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Flicker on digital output

Created by: Nachogularte at: 8/16/2022 2:18 PM (5 Replies)

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8/16/2022 2:18 PM	Rate (0)
Nachogularte Member Joined: 7/26/2022 Last visit: 8/16/2022 Posts: 7 Rating: (0)	Buenos días a todo Good morning everyone. I have a 4-20ma analog input connected to an AM2 expansion module. It opens and closes a pneumatic valve depending on the threshold value. I have a problem that the signal oscillates and it causes me to close and open the valve, in the same way that the analog input does. It's like the valve blinks until it passes completely and stays above the threshold. Is there any way to solve this?
	Last edited by: Jen_Moderator at: 08/17/2022 10:34:25 Headline translated. Text formatting optimized.
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8/16/2022 2:45 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	Nachogularte Good morning everyone. I have a 4-20ma analog input connected to an AM2 expansion module. It opens and closes a pneumatic valve depending on the threshold value. I have a problem that the signal oscillates and it causes me to close and open the valve, in the same way that the analog input does. It's like the valve blinks until it passes completely and stays above the threshold. Is there any way to solve this? Did you program a hysteresis or only a threshold? Please upload your program as a ZIP file.

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8/16/2022 5:50 PM	Rate (0)
Nachogularte Member Joined: 7/26/2022 Last visit: 8/16/2022 Posts: 7 Rating: (0)	solo umbral, ¿cómo se carga la histéresis? . ok cuando tenga el programa lo subo.

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8/16/2022 7:03 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	English please ...

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8/17/2022 10:35 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8171 Rating: (174)	Hi Nachogularte, welcome to the Technical Forum Please try to discuss your question in English language. This is an international community and we try to focus on one language. Posting in English will help you to get more response to your question. This is the translation of your question: Nachogularte only threshold, how do you load the hysteresis? . ok when I have the program I will upload it. Regards, Jen_Moderator

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8/18/2022 10:07 AM	Rate (0)
Mr.V Silver Member Joined: 6/19/2019 Last visit: 9/8/2025 Posts: 743 Rating: (79)	I little bit don't undestand if you do bigger range for analog threshold trigger then your valve don't open/close then your analog signal will be near setpoint. Change Threshodl ON like 100 Threshold OFF like 80 then valve will open then reach 100 and closes then 80. If you don't like this then put OFF-Delay timer and enter specified time then valve reach specifield value it open and then it suddenly drop timer don't let close valve for that time

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