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Sensors with different supply voltages

Created by: shatha at: 10/21/2020 8:43 PM (5 Replies)

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10/21/2020 8:43 PM	Rate (0)
shatha Posts: 11 Rating: (0)	I have many sensors working with different voltage 12V , 5V How can I connect the M for plc with the negative for sensors’ power supply without make any defect in plc or make ground loop and what the purpose of earthing
shatha Posts: 11 Rating: (0)
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10/21/2020 8:50 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/15/2025 Posts: 35962 Rating: (4502)	You can connect the M of the different power supplies. But if the M of one or more power supplies is connected to the protective earth, is the protective isolation of the LOGO! not longer given.

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10/21/2020 9:59 PM	Rate (0)
shatha Posts: 11 Rating: (0)	ixo65 You can connect the M of the different power supplies. But if the M of one or more power supplies is connected to the protective earth, is the protective isolation of the LOGO! not longer given. "is the protective isolation of the LOGO! not longer given. " .Can you explain what do you mean by that? Is it save to connect grounds of different voltage together, Will not create ground loop?
shatha Posts: 11 Rating: (0)	Last edited by: shatha at: 10/21/2020 22:02:30 Last edited by: shatha at: 10/21/2020 22:03:07
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10/21/2020 10:09 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/15/2025 Posts: 35962 Rating: (4502)	Appliance classes Attachment LOGO! 8 manual 0BA8 2014_06 page 38.pdf (326 Downloads)

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10/23/2020 1:00 PM	Rate (0)
M111 Bronze Member Joined: 8/2/2018 Last visit: 12/16/2023 Posts: 302 Rating: (5)	I have question too. Does it need to connect M to FE..?

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10/23/2020 1:16 PM	Rate (0)
Mr.V Silver Member Joined: 6/19/2019 Last visit: 9/8/2025 Posts: 743 Rating: (79)	Hello, If you use discrete input see table it will go to state 1 from 8.5V or 12V by LOGO! model, so if you use sensor with 5 V you will not get state 1. Attachment 1.png (299 Downloads)

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