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Foundation Fieldbus Connector

Foundation Fieldbus Connector

Foundation Fieldbus Connector

(OP)
Foundation fieldbus Connectors have 4 pins but only 2 are necessary. What are the other 2 for? Our contractor claims connectos with only 2 pins are suitable, where can I base his allegations on?

RE: Foundation Fieldbus Connector

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.

RE: Foundation Fieldbus Connector

(OP)
Actually I mean not the H1 but the spur segment.  

RE: Foundation Fieldbus Connector

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.

RE: Foundation Fieldbus Connector

(OP)
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.

RE: Foundation Fieldbus Connector

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.

RE: Foundation Fieldbus Connector

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

RE: Foundation Fieldbus Connector

(OP)
Thanks to djs and danw2.

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