Analog inputs and analog outputs

Greetings of the day,

I need to understand analog inputs and outputs

Consider an example,

I have 2 power sources of 230v while one is active the other should be off and vice versa

what are the possible solutions can be made using a PLC with analog inputs and outputs

Best regards

Amal

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Amal Rank: 88

Asked 8 months ago

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Usually analog I/O need 24V DC power. If you PLC has internal 230VAC~24VDC converter. Then your question will be how to make 230VDC redundant. Nomally 2 different 230AC income power cannot be connected together. While some UPS support parrelling configuration.
If you PLC don't have internal converter. You can arrange 2 230VAC~24VDC supply and a power voting unit or diode to balance the 24V power come from different 24V power module.

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by Amal Rank: 88 on 5/14/2020 9:48:03 PM | Like (0) | Report

Sir,
I think you have completely misunderstood my scenario

If I have 2 signals of 230v AC supply to a device. the first one is the primary supply and the second one is secondary if in case of first supply is not getting I need to provide the secondary supply to the device.

I need the solution how could I do it using a PLC program

Using a Voltage or Current transmitter?

by Gao Huan Rank: 221 on 5/16/2020 1:50:14 AM | Like (0) | Report

Why using a PLC? If you don’t mind the switching time. A relay will simple work out with A1 A2 monitoring the primary Power source, 14-L1, 12-L2, 24-N1, 22-N2, 11-DevL, 21-DevN. If you use analog I/o only, you certainly need a voltage transmitter. If you have DI, you can use a voltage relay for that. Usually for auto switching we use voltage monitoring relay’s NC contact to make the logic.

by Amal Rank: 88 on 5/17/2020 9:40:25 PM | Like (0) | Report

It should be done in sharp time sir

Also, there is something more to do with a PLC than this

I will share my ideas

I can use a voltage or current transmitted for a 230v ca supply and will get to know the value of the analog.
I can do the programming for that my real trouble is how will I control the other one. I'm thinking that taking it as an Output and do the programming. How do I configure the output for it?

That's my real trouble sir hope you can help me out

thanks in advance

by Gao Huan Rank: 221 on 5/18/2020 3:51:25 AM | Like (0) | Report

Hi. I don’t know what your device is. If you want no switching time, special power equipment is needed. That’s why AC-DC-AC device is invented to make the power steady. Usually the logic of AC power switching is you find Bus A lost and you open Bus A inlet Breaker and close Bus B inlet breaker. What the PLC control is breaker not voltage.

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Gao Huan Rank: 221

Answered 8 months ago

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Analog inputs and analog outputs

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