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3-wire on F-AI 8xI 2-/4-wire HART HA

11/8/2022 8:55 AM	Rate (0)
A_Jiska Regular Member Joined: 4/18/2014 Last visit: 10/31/2024 Posts: 17 Rating: (0)	Good morning, We have this card in our project F-AI 8xI 2-/4-wire HART HA. And have to connect a 3-wire gas detector to this card. Can anyone tell me if this is possible and how to wire it up. The examples only show 2 and 4 wire options.

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11/8/2022 10:05 AM	Rate (0)
SCOTT123 Bronze Member Joined: 10/16/2007 Last visit: 11/1/2024 Posts: 634 Rating: (45)	Hello, you connect the 3-wire sensor like the 4 wire. You make a bridge of the 0 volt of the "missing" wire. Scott

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11/8/2022 10:15 AM	Rate (0)
A_Jiska Regular Member Joined: 4/18/2014 Last visit: 10/31/2024 Posts: 17 Rating: (0)	SCOTT123 Hello, you connect the 3-wire sensor like the 4 wire. You make a bridge of the 0 volt of the "missing" wire. Scott Hello SCOTT123, Thanks for the answer, can you please check my drawing (see attachment). Blue are the 3 wires to the field element. Red not used Green the bridge of the 0 Volt? Attachment 3-WIRE.png (880 Downloads)

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11/8/2022 1:19 PM	Rate (0)
SCOTT123 Bronze Member Joined: 10/16/2007 Last visit: 11/1/2024 Posts: 634 Rating: (45)	You need to connect the blue of 2M- to the green wires of the plc.

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11/9/2022 8:59 AM	Rate (0)
A_Jiska Regular Member Joined: 4/18/2014 Last visit: 10/31/2024 Posts: 17 Rating: (0)	SCOTT123 You need to connect the blue of 2M- to the green wires of the plc. Hello SCOTT123, Please see attached. I think this will work then. When my materials are delivered by Siemens I will test this 3-wire function. Thanks. Attachment 3-WIRE-NEW.png (682 Downloads)

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11/9/2022 9:37 AM	Rate (0)
SCOTT123 Bronze Member Joined: 10/16/2007 Last visit: 11/1/2024 Posts: 634 Rating: (45)	Looks good!

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