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Pi controller

Created by: MSDHJP at: 11/25/2024 5:27 AM (10 Replies)

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11/25/2024 5:27 AM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	The ship's rudder angle control includes -two solenoid valves (on/off) as outputs -and a 4-20mA feedback signal as input - and an analouge 0-10 V as disiered location that selected by captain. . Each solenoid, when activated, turns the angle in one direction (right or left).by oppening hydrolic valve. Is a PI controller useful for this system, as we know, in the system output is 24V digital signal to on solenoid valve. If yes, how can we convert its analog output to digital in program?
	Last edited by: MSDHJP at: 11/25/2024 05:28:25 Last edited by: MSDHJP at: 11/25/2024 05:57:14 Last edited by: MSDHJP at: 11/25/2024 05:57:24 Last edited by: MSDHJP at: 11/25/2024 06:04:35
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11/25/2024 5:44 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/11/2025 Posts: 35949 Rating: (4500)	Sorry, but I don't understand your description. What exactly is the analog signal? What physical value (range and unit) does the 4-20 mA signal correspond to? How should LOGO! react to this?

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11/25/2024 6:06 AM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	I revised it, Sir ixo65 Sorry, but I don't understand your description. What exactly is the analog signal? What physical value (range and unit) does the 4-20 mA signal correspond to? How should LOGO! react to this?

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11/25/2024 7:39 AM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	I ask my question in a different way. A control system whose output is on/off. Is there an advantage to using a PI controller for it? MSDHJP I revised it, Sir ixo65 Sorry, but I don't understand your description. What exactly is the analog signal? What physical value (range and unit) does the 4-20 mA signal correspond to? How should LOGO! react to this?

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11/25/2024 8:11 AM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	MSDHJP I ask my question in a different way. A control system whose output is on/off. Is there an advantage to using a PI controller for it? MSDHJP I revised it, Sir ixo65 Sorry, but I don't understand your description. What exactly is the analog signal? What physical value (range and unit) does the 4-20 mA signal correspond to? How should LOGO! react to this? Attachment PI CONTROLLER .jpg (327 Downloads)

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11/25/2024 5:31 PM	Rate (0)
Ella_68 Gold Member Joined: 6/11/2019 Last visit: 9/10/2025 Posts: 2628 Rating: (122)	Hello MSDHJP, MSDHJP I ask my question in a different way. A control system whose output is on/off. Is there an advantage to using a PI controller for it? Since the valves only switch on and off and do not have valves that can be regulated in terms of flow, a PI controller is of no use to you. The only thing that would work is two opposing comparators that compare the captain's command with the angle of the rudder machine and then switch the corresponding valve. Greetings Ella_68 (translated by google)

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This contribution was helpful to 1 thankful Users MSDHJP

11/26/2024 5:57 PM	Rate (0)
PADRE PIO Member Joined: 4/11/2022 Last visit: 9/9/2025 Posts: 90 Rating: (7)	For digital output, I would suggest to use PWM block. For me worked very well!
	Rgds, Padre Pio Automation
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11/26/2024 6:02 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/11/2025 Posts: 35949 Rating: (4500)	PADRE PIO For digital output, I would suggest to use PWM block. For me worked very well! It may be the right one for your application. But not for the application of the topic starter...

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1/29/2025 12:18 PM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	Ella_68 Hello MSDHJP, MSDHJP I ask my question in a different way. A control system whose output is on/off. Is there an advantage to using a PI controller for it? Since the valves only switch on and off and do not have valves that can be regulated in terms of flow, a PI controller is of no use to you. The only thing that would work is two opposing comparators that compare the captain's command with the angle of the rudder machine and then switch the corresponding valve. Greetings Ella_68 (translated by google) A question: When using a comparator in this way, the input values must be exactly equal. Besides using averaging, do you have any ideas on how to solve this issue?

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2/3/2025 6:59 AM	Rate (0)
MSDHJP Joined: 3/15/2022 Last visit: 2/11/2025 Posts: 28 Rating: (0)	DearIxo65 please answer my question

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