Wika DPT-10 Manual do Utilizador Página 87

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The status byte corresponds to prole 3.0 "Probus PA Prole for Process Control Devices" coded.
The status "Measured value OK" is coded as 80 (hex) (Bit7 = 1, Bit6 0 = 0).
The measured value is transferred as a 32 bit 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)
Fig. 58: Data format of the measured value
Coding of the status byte associated with the PA output value
Status
code
Description according to Pro-
bus standard
Possible cause
0x00 bad - non-specic Flash-Update active
0x04 bad - conguration error l Adjustment error
l Conguration error with PV-Scale (PV-Span too small)
l Unit irregularity
l Error in the linearization table
0x0C bad - sensor failure l Hardware error
l Converter error
l Leakage pulse error
l Trigger error
0x10 bad - sensor failure l Measured value generation error
l Temperature measurement error
0 x 1f bad - out of service constant "Out of Service" mode switched on
0 x 44 uncertain - last unstable value Failsafe replacement value (Failsafe-Mode = "Last value" and
already valid measured value since switching on)
0 x 48 uncertain substitute set l Switch on simulation
l Failsafe replacement value (Failsafe-Mode = "Fsafe value")
0 x 4c uncertain - initial value Failsafe replacement value (Failsafe-Mode = "Last valid value" and
no valid measured value since switching on)
0 x 51 uncertain - sensor; conversion
not accurate - low limited
Sensor value < lower limit
0 x 52 uncertain - sensor; conversion
not accurate - high limited
Sensor value > upper limit
0 x 80 good (non-cascade) - OK OK
0 x 84 good (non-cascade) - active
block alarm
Static revision (FB, TB) changed (10 sec. active, after the parameter
of the static category was written)
Dierential pressure transmitter DPT10 - metal measuring diaphragm Probus PA 87
11 Supplement
37245-EN-100120
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