Foundation Fieldbus Connector

• Jun 24, 2010

• #2

djs

Electrical

Mar 21, 2001

719

I believe that Foundation Fieldbus H1 is a two wire interface. The two wires carry both 24 VDC for device power and also the communications signal.
I was not aware that there is/was a "standard" connector for FF H1.

 

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• Jun 25, 2010

• Thread starter
• #3

rodneysab

Petroleum

Jan 16, 2009

5

Actually I mean not the H1 but the spur segment.

 

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• Jun 25, 2010

• #4

djs

Electrical

Mar 21, 2001

719

FF H1 is the fieldbus that uses 24VDC with Manchester encoding for the data. They have another, newer fieldbus that is ethernet based.

So your "spur" lines are also H1.

 

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• Jun 28, 2010

• Thread starter
• #5

rodneysab

Petroleum

Jan 16, 2009

5

Ok in this case only two pins are really necessary. But why are there connectors with 4 pins? So far I haven´t got any reasonable explanation.
Thanks anyway.

 

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• Jun 28, 2010

• #6

djs

Electrical

Mar 21, 2001

719

You are probably talking about the M12 type connectors. These are a standard, general purpose connector that is reasonably water proof. Used quite frequently in Europe. For some reason seems to have become widely used with FF H1 and also Profibus-PA. Both of those fieldbusses use the same electrical interface. So one answer is legacy and history.

 

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• Jun 28, 2010

• #7

danw2

Industrial

Oct 21, 2004

1,505

Note that all three Foundation Fieldbus connectors, whether M12 or 7/8" 4 pole connectors, use only one pair of signal wires and a shield wire:

ABB 7/8" pinout

Turck 7/8" pinout

Turck M12 pinout

 

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• Jun 29, 2010

• Thread starter
• #8

rodneysab

Petroleum

Jan 16, 2009

5

Thanks to djs and danw2.

 

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