WIKA DPT-10 - Manual (Page 87)

The status byte corresponds to profile 3.0 "Profibus PA Profile 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 floating 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-
fibus standard Possible cause
0x00 bad - non-specific Flash-Update active
0x04 bad - configuration error l Adjustment error
l Configuration 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 "O ut 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)
Differential pressure transmitter DPT10 - metal measuring diaphragm • Profibus PA 87
11 Supplement
37245
-
EN
-100120