<s>
Foundation	B-Application
Fieldbus	I-Application
(	O
styled	O
Fieldbus	O
)	O
is	O
an	O
all-digital	O
,	O
serial	B-Protocol
,	O
two-way	O
communications	O
system	O
that	O
serves	O
as	O
the	O
base-level	O
network	O
in	O
a	O
plant	O
or	O
factory	O
automation	B-Application
environment	O
.	O
</s>
<s>
It	O
is	O
an	O
open	B-Architecture
architecture	I-Architecture
,	O
developed	O
and	O
administered	O
by	O
FieldComm	O
Group	O
.	O
</s>
<s>
Foundation	B-Application
Fieldbus	I-Application
technology	O
is	O
mostly	O
used	O
in	O
process	O
industries	O
,	O
but	O
has	O
recently	O
been	O
implemented	O
in	O
powerplants	O
.	O
</s>
<s>
Two	O
related	O
implementations	O
of	O
Foundation	B-Application
Fieldbus	I-Application
have	O
been	O
introduced	O
to	O
meet	O
different	O
needs	O
within	O
the	O
process	O
automation	B-Application
environment	O
.	O
</s>
<s>
Foundation	B-Application
Fieldbus	I-Application
H1	I-Application
-	O
Operates	O
at	O
31.25	O
kbit/s	O
and	O
is	O
generally	O
used	O
to	O
connect	O
to	O
field	O
devices	O
and	O
host	O
systems	O
.	O
</s>
<s>
It	O
does	O
n't	O
currently	O
provide	O
power	O
over	O
the	O
cable	O
,	O
although	O
work	O
is	O
under	O
way	O
to	O
address	O
this	O
using	O
the	O
IEEE802.3af	B-Device
Power	B-Device
over	I-Device
Ethernet	I-Device
(	O
PoE	B-Device
)	O
standard	O
.	O
</s>
<s>
Foundation	B-Application
Fieldbus	I-Application
was	O
originally	O
intended	O
as	O
a	O
replacement	O
for	O
the	O
4-20	O
mA	O
standard	O
,	O
and	O
today	O
it	O
coexists	O
alongside	O
other	O
technologies	O
such	O
as	O
Modbus	B-Protocol
,	O
Profibus	O
,	O
and	O
Industrial	B-Protocol
Ethernet	I-Protocol
.	O
</s>
<s>
Foundation	B-Application
Fieldbus	I-Application
today	O
enjoys	O
a	O
growing	O
installed	O
base	O
in	O
many	O
heavy	O
process	O
applications	O
such	O
as	O
refining	O
,	O
petrochemicals	O
,	O
power	O
generation	O
,	O
and	O
even	O
food	O
and	O
beverage	O
,	O
pharmaceuticals	O
,	O
and	O
nuclear	O
applications	O
.	O
</s>
<s>
Foundation	B-Application
Fieldbus	I-Application
was	O
developed	O
over	O
a	O
period	O
of	O
many	O
years	O
by	O
the	O
International	O
Society	O
of	O
Automation	B-Application
,	O
or	O
ISA	O
,	O
as	O
SP50	O
.	O
</s>
<s>
The	O
International	O
Electrotechnical	O
Commission	O
(	O
IEC	O
)	O
standard	O
on	O
field	O
bus	O
,	O
including	O
Foundation	B-Application
Fieldbus	I-Application
,	O
is	O
IEC	O
61158	O
.	O
</s>
<s>
Type	O
1	O
is	O
Foundation	B-Application
Fieldbus	I-Application
H1	I-Application
,	O
while	O
Type	O
5	O
is	O
Foundation	B-Application
Fieldbus	I-Application
HSE	O
.	O
</s>
<s>
An	O
explanation	O
of	O
how	O
Foundation	B-Application
Fieldbus	I-Application
works	O
and	O
how	O
it	O
is	O
used	O
in	O
continuous	O
process	O
control	O
is	O
in	O
the	O
Foundation	B-Application
Fieldbus	I-Application
Primer	O
which	O
may	O
be	O
found	O
at	O
the	O
Fieldbus	O
Inc	O
.	O
website	O
.	O
</s>
