WIKA IPT-10, Руководство по эксплуатации

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D ata format of the output signal
Byte4 Byte3 Byte2 Byte1 Byte0
Status Value (IEEE-754)
F ig . 20 : D ata format of the output signal
T he status byte corresponds to pro fi le
3
.
0
"
P ro fi bus PA P ro fi le for P rocess C ontrol D evices
"
coded .
T he status " M easured value OK " is coded as
80
( hex ) ( B it
7
=
1
, B it
6
…
0
=
0
).
T he measured value is transferred as a
32
bit fl oating point number in the IEEE -
754
format .
Byte n
Byte n+1
Bit
7
VZ
Exponent
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Sign
Bit
Significant
7
6 5
4
3 2 1 0 -1 -2
-3
-4 -5 -6 -7
Byte n+2
Byte n+3
Bit
7
2
Significant
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Significant
-9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23
-8
Value = (-1)
VZ
2
(Exponent - 127)
(1 + Significant)
F ig . 21 : D ata format of the measured value
C oding of the status byte associated with the PA output value
S tatus
code
D escription according to P ro -
fi bus standard
P ossible cause
0
x
00
bad - non - speci fi c F lash - U pdate active
0
x
04
bad - con fi guration error
l
A djustment error
l
C on fi guration error with PV - S cale ( PV - S pan too small )
l
U nit irregularity
l
E rror in the linearization table
0
x
0
C bad - sensor failure
l
H ardware error
l
C onverter error
l
L eakage pulse error
l
T rigger error
0
x
10
bad - sensor failure
l
M easured value generation error
l
T
emperature measurement error
0
x
1
f bad - out of service constant " O ut of S ervice " mode switched on
0
x
44
uncertain - last unstable value F ailsafe replacement value ( F ailsafe - M ode = " L ast value " and
already valid measured value since switching on
)
0
x
48
uncertain substitute set
l
S witch on simulation
l
F ailsafe replacement value ( F ailsafe - M ode = " F safe value " )
50
P
rocess pressure transmitter
IPT -
10
V
ers
.
2
.
0
-
ceramic sensor
• P
ro fi bus
PA
10
S
upplement
31541
-
EN
-
110418