FD67 Profibus-DP Manual
44
7.3.1 Diagnosis
Overflow
The FD67 bus node can process up to 32 channel-related diagnosis messages and report them to the DP
master. In presence of more than 32 channel-related diagnosis, the Diag.ext_overflow bit (standard
diagnotic information, byte 2) is set in the DP diagnosis message.
♦
Fig. 7-5 : Max. number of channel-related diagnosis
Station-related diagnosis includes one module-related diagnosis byte for each I/O module.
Bytes 10 to 25
Module-related diagnosis (1 byte for each module)
7 6 5 4 3 2 1 0
U
U
U
n
nn
d
dd
e
ee
r
rr
v
vv
o
oo
l
ll
t
tt
a
aa
g
gg
e
ee
s
ss
e
ee
n
nn
s
ss
o
oo
r
rr
s
ss
u
uu
p
pp
p
pp
l
ll
y
yy
N
N
N
o
o
o
s
s
s
e
e
e
n
n
n
s
s
s
o
o
o
r
r
r
s
s
s
u
u
u
p
p
p
p
p
p
l
l
l
y
y
y
U
U
U
n
n
n
d
d
d
e
e
e
r
r
r
v
v
v
o
o
o
l
l
l
t
t
t
a
a
a
g
g
g
e
e
e
a
a
a
c
c
c
t
t
t
u
u
u
a
a
a
t
t
t
o
o
o
r
r
r
s
s
s
u
u
u
p
p
p
p
p
p
l
l
l
y
y
y
N
N
N
o
o
o
a
a
a
c
c
c
t
t
t
u
u
u
a
a
a
t
t
t
o
o
o
r
r
r
s
s
s
u
u
u
p
p
p
p
p
p
l
l
l
y
y
y
U
U
U
n
n
n
d
d
d
e
e
e
r
r
r
v
v
v
o
o
o
l
l
l
t
t
t
a
a
a
g
g
g
e
e
e
e
e
e
x
x
x
t
t
t
e
e
e
r
r
r
n
n
n
a
a
a
l
l
l
a
a
a
c
c
c
t
t
t
u
u
u
a
a
a
t
t
t
o
o
o
r
r
r
s
s
s
u
u
u
p
p
p
p
p
p
l
l
l
y
y
y
N
N
N
o
o
o
e
e
e
x
x
x
t
t
t
e
e
e
r
r
r
n
n
n
a
a
a
l
l
l
a
a
a
c
c
c
t
t
t
u
u
u
a
a
a
t
t
t
o
o
o
r
r
r
s
s
s
u
u
u
p
p
p
p
p
p
l
l
l
y
y
y
Channel-related diagnosis
C
C
C
o
oo
m
m
m
m
m
m
u
uu
n
nn
i
ii
c
cc
a
aa
t
tt
i
ii
o
oo
n
nn
f
ff
a
aa
u
uu
l
ll
t
tt
The collective bit „Channel-related diagnosis" is set only in presence of at least one channel-related
diagnosis for the I/O module and if it belongs to the 32 channel-related diagnosis messages that can be
reported.
This is also the case if the channel-related diagnosis has been masked out via the bus node
parameterisation. The Diag.ext_overflow bit is set in both cases.
Max. 32 channel-related diagnosis
Additional diagnostic information are
displayed via the LEDs on the I/O modules ;
they are not reported in the DP diagnosis
message.