28
S
Stta
attu
us
s =
= u
un
nc
ce
errtta
aiin
n
0
1
0
0
0
0
= non-specific
0
1
0
0
0
1
= last usable value
0
1
0
0
1
0
= substitute-set
0
1
0
0
1
1
= initial value
0
1
0
1
0
0
= sensor conversion not accurate
0
1
0
1
0
1
= engineering unit violation (unit not in the valid set)
0
1
0
1
1
0
= sub-normal
0
1
0
1
1
1
= configuration error
0
1
1
0
0
0
= simulated value
0
1
1
0
0
1
= sensor calibration
S
Stta
attu
us
s =
= L
Liim
miitts
s
0
0
= ok
0
1
= low limited
1
0
= high limited
1
1
= constant
S
Stta
attu
us
s =
= g
go
oo
od
d ((N
No
on
n--C
Ca
as
sc
ca
ad
de
e))
1
0
0
0
0
0
= ok
1
0
0
0
0
1
= update event
1
0
0
0
1
0
= active advisory alarm (priority < 8)
1
0
0
0
1
1
= active critical alarm (priority > 8)
1
0
0
1
0
0
= unacknowledged update event
1
0
0
1
0
1
= unacknowledged advisory alarm
1
0
0
1
1
0
= unacknowledged critical alarm
1
0
1
0
0
0
= initiate fail safe
1
0
1
0
0
1
= maintenance required
Check the first two quality bits in order to get the quality information of the measurement
value:
G
Go
oo
od
d
((n
no
on
n C
Ca
as
sc
ca
ad
de
e))
function block output value is ok and can be used without restrictions
G
Go
oo
od
d
((C
Ca
as
sc
ca
ad
de
e))
will not be supported, because it is not applicable for the device
U
Un
nc
ce
errtta
aiin
n
function block output value can be used but the accuracy can not be guar-
anteed (e.g. function block outputs value has been frozen or A/D converter
is saturated or out of range)
B
Ba
ad
d
function block output value is bad - don’t use it for process control!
The „Quality-Substatus“- and „Limit“-Bits will be used for further diagnostics or limit check-
ing.
Attention:
The status should be monitored because a number will be transmitted even if
the status of the measurement value is bad or uncertain. This is the only way to check the
quality of the transmitted measurement values.
3.7 Diagnosis
If the device internal diagnostic functions detect an error additional information will be sent to
the Master (for further information have a look at the UNIT_DIAG_BIT(i) definitions of the cor-
responding GSD-file).
