44
7.3 Other Fault Conditions
The following fault tracing diagram will help you to locate and fix some of the most usual problems.
If the problem persists contact your local distributor.
Figure 9. Fault tracing diagram for Modbus RTU
.
Ch
ec
k
cabli
ng
Ch
ec
k
gr
ou
nd
in
g
9330.emf
N
o
co
m
m
un
ic
at
io
n
Co
un
te
r
OK
Po
or
co
m
m
un
ic
at
io
n
Ch
ec
k
co
m
m
un
i-
ca
tio
n
st
at
us
(p
ar
.
5.
7.
3.
2.
1/5
.8.
3.
2.
2)
Co
un
te
r
do
es
no
t
ru
n
Co
un
te
r
fo
r
bad
fr
am
es
(s
ee
Ta
bl
e
3)
in
cr
ea
se
s
Ch
ec
k
fie
ldb
us
param
et
er
s
bu
s
para
m
eter
s
in
me
nu
Ch
ec
k
ot
he
rf
ie
ld
-
Ch
ec
k
se
le
ct
ed
pr
ot
oco
l
Ch
ec
k
te
rm
in
ati
on
re
si
st
or
s
Ch
ec
k
tha
tb
ot
h
en
ds
of
th
e
fie
ld
bu
s
lin
e
ha
v
termi
-
na
tio
n
re
si
st
or
s
(chapt
er
4.
4)
Ch
ec
k
pa
ra
m
et
ers
e
Is
th
e
de
vi
ce
in
R
EA
D
Y
st
at
e?
C
he
ck
M
as
te
r’s
pa
ram
et
er
s
Is
field
bu
s
se
le
ct
ed
as
co
nt
ro
lp
lac
e?
D
oe
s
M
as
te
r
gi
ve
R
U
N
co
m
m
and
?
C
he
ck
cab
lin
g
Ch
ec
k
ter
m
ina
tio
n
re
si
st
ors
O
th
er
bu
s
de
vi
ce
s
Ch
ec
k
conn
ec
tio
ns
Ch
ec
k
th
e
le
d
on
key
pa
d
Ch
ec
k
ex
ter
na
l
in
te
rl
oc
ki
ng
s
(I/O)
Ch
ec
k
co
nfig
ur
a-
tio
ns
(Sl
a
e
ad
d-
re
ss
,b
au
dr
at
e
et
c.
)
v
Ch
ec
k
dis
ta
nc
es
bet
w
ee
n
ca
bl
es
,
se
e
ch
ap
te
r
4.
4.
Ch
ec
k
cab
le
ty
pe
s,
se
e
ch
ap
te
r
3.
Ch
ec
k
gr
ou
nd
in
g,
se
e
chapte
r
4.
R
e-
me
m
be
r
to
m
ak
e
gr
oun
di
ng
fo
re
ac
h
de
vi
ce
!
Ch
ec
k
te
rm
in
al
sf
or
lo
os
e
co
nn
ec
tio
ns
Ch
ec
k
st
rip
pi
ng
of
ca
bl
es
an
d
con
du
ct
or
s,
se
e
ch
ap
te
r4
.
U
se
ke
yp
ad
to
m
on
ito
r
va
ri
ab
le
Ch
ec
k
tha
tb
ot
h
en
ds
of
th
fie
ld
bu
s
lin
e
ha
ve
t
rm
in
a-
tio
n
re
si
st
or
s
(c
ha
pt
er
4.
4)
e
e
Ch
ec
k
cab
le
fo
r
cu
ts
Chec
k
co
rr
ec
tpla
ce
-
m
en
to
fc
on
du
ct
or
s
in
te
rmina
ls
Ch
ec
k
oth
er
ne
ces
sa
ry
devic
es
(e
.g
.r
ou
ter
)
D
ri
ve
do
es
no
t
st
ar
tf
ro
m
th
e
bu
s
Che
ck
p
ar
am
ete
r
M
1.1
5
or
M3.
2.
1
Содержание Praxi 100
Страница 1: ...Safe solutions for your industry Manual MODBUS Praxi 100...
Страница 51: ...51...