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How to connect 3 wire current transmitter to sm331

6/16/2010 7:37 AM	Rate (0)
Atn Experienced Member Joined: 2/20/2009 Last visit: 2/13/2025 Posts: 21 Rating: (0)	Hallo, I have sm331 module, order number 6ES7 331-7KF02-0AB0. Everything is clear with 2 wire current transmitters. But on one of the input groups I need to connect current transmitter which have 3 wire interface - current loop closes between current output and the power supply ground of the transmitter. The transmitter is powered by the same 24V supply that powers the module itself. This case is not clarified it the module data manual. So, my question is this - should I connect M- of the according channel with M of the module, or there is another way to connect 3 wire transmitter.

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6/16/2010 8:32 AM	Rate (0)
AMAZINGAHMED Gold Member Joined: 8/27/2006 Last visit: 10/22/2024 Posts: 719 Rating: (88)	I hope this manual helps Attachment AnalogInput.pdf (941 Downloads)
	The more you know, The more you know that you don't know
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6/16/2010 8:46 AM	Rate (0)
RBM Bronze Member Joined: 8/21/2008 Last visit: 7/25/2025 Posts: 141 Rating: (6)	Atn I have sm331 module, order number 6ES7 331-7KF02-0AB0. Everything is clear with 2 wire current transmitters. But on one of the input groups I need to connect current transmitter which have 3 wire interface - current loop closes between current output and the power supply ground of the transmitter. The transmitter is powered by the same 24V supply that powers the module itself. This case is not clarified it the module data manual. So, my question is this - should I connect M- of the according channel with M of the module, or there is another way to connect 3 wire transmitter. Please find the post from "Ayman" in the earlier conversation for the Analog input connection (SM331) [represented voltage, Current and RTD connection] click here
	Last edited by: RBM at: 6/16/2010 8:46 AM
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6/16/2010 9:01 AM	Rate (0)
Atn Experienced Member Joined: 2/20/2009 Last visit: 2/13/2025 Posts: 21 Rating: (0)	I know how to connect the described in the manual transmitters. I want to know if it's safe to connect M- of the channel configured for 4 wire current measurement to M of the module power supply, because this is the path of the current loop for my 3 wire current transmitter.

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6/16/2010 10:02 AM	Rate (0)
SINAMICS_TO Bronze Member Joined: 4/24/2008 Last visit: 1/15/2025 Posts: 213 Rating: (16)	Your "3 wire" current transmitter is a non isolated 4 wire transmitter. Look at this FAQ http://support.automation.siemens.com/WW/view/en/10805166/133000. There you will find a wiring diagram for your case.

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