User's Manual
Network
Design Best
Practices
December
2015
Reference
Manual
00809-0100-4045,
Rev
01
Network
Design Best
P
ra
c
ti
c
e
s
49
Appendix
D
N
e
t
w
ork
Design
Best
Prac
tic
e
s
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page
49
E
ff
ec
t
iv
e
range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page
49
D.1 Overview
All
recommended practices should
be followed
to
ensure highest
d
a
t
a
reliability.
D
e
vi
a
t
ion
from
t
h
e
s
e
best pra
c
t
i
ce
s
may require device
repe
a
t
e
r
s
in the
ne
t
wo
r
k
to
maintain
99%
data
reliability.
The
following
are guidelines
to
achieve
t
h
e
best possible wireless
n
e
t
wo
r
k
.
Each wireless
n
e
t
wor
k
field
should
be
scoped
to
a single process
un
i
t
.
Minimize
t
h
e
number of
hops
to
t
h
e
Gateway
in order to
reduce latency.
A
minimum of five
wireless
instr
u
me
n
t
s
should be
within
eff
ec
t
i
v
e
range
of
th
e
Emerson Wireless
G
a
t
e
w
a
y
.
Each device
in
t
h
e
n
e
t
wor
k
should have
a
t
minimum
t
h
ree
devices
with po
t
e
n
t
i
a
l
communication
paths. A mesh
n
e
t
wor
k
gets
i
t
s
re
li
abili
t
y
from
mu
lt
iple
communication
pathways.
E
n
su
r
i
ng
each device has
multiple
neighbors
wi
thin
range
will
res
u
l
t
in
t
h
e
mos
t
reliable
n
e
t
wor
k
.
Have
25
perc
e
n
t
of
wireless
instr
u
me
n
t
s
in
t
h
e
n
e
t
wor
k
within
range
of
E
m
e
r
son
Wireless Gateway. O
t
he
r
enhancing
mo
dif
i
ca
ti
on
s
include
cre
a
t
i
ng
a
higher
perc
e
n
t
a
g
e
of
devices
within
e
ff
ec
t
iv
e
range
of the g
a
t
e
wa
y
to
35
perc
e
n
t
or more.
This clusters
more
devices around
t
h
e
gateway and ensures fewer hops and
more
band
wi
d
t
h
available
to
WirelessHART devices
with
fast scan
r
a
t
e
s.
Eff
ec
t
iv
e
range is
de
t
e
r
m
ined
by
t
y
pe
of
process
unit
and
the
density
of
the
i
n
f
r
a
s
truc
tu
re
that
surrounds
the
ne
t
wo
r
k.
D.2
Effective
range
Heavy
Ob
str
u
c
t
ion
:
100
ft.
(30 m).
Typical heavy
de
nsi
t
y
p
l
an
t
environment.
Canno
t
drive
a
truck or equipm
e
n
t
through.
Medium
O
b
struc
t
i
o
n
:
250
ft.
(76 m).
Typical
light
process areas,
lots of
space
be
t
w
ee
n
equi
p
m
e
n
t
and
i
n
fra
s
t
r
uc
tu
re
.
Light
O
bstr
u
c
t
i
o
n
:
500
ft.
(152 m).
Typical
of tank
farms. Despite
t
a
nks
being
bi
g
ob
st
ru
c
t
io
ns
themselves,
lots of
space
be
t
w
ee
n
and above makes
for good
RF
prop
ag
a
t
ion.
Line
of
Sight:
750
ft.
(230 m).
No obstr
u
c
t
i
o
ns
be
t
w
ee
n
WirelessHART devices and
devic
e
s
moun
t
e
d
a
minimum of 6
ft.
(2 m)
above
ground or obstr
u
c
t
ions.
For examples and
c
omple
t
e
expl
an
a
t
ions,
refer
to
the
IEC62591 WirelessHART
System
Engineering
Guide.