Vega VEGAPULS 63 Operating Instructions Manual page 61

The measured value is transferred as a 32 bit floating point number in the IEEE-754 format.
Byte n
Bit
Bit Bit Bit Bit Bit Bit
7 6 5 4 3 2 1
VZ 2 4
2 7 2 6 5 2 2 3 2
Sign
Exponent
Bit
(Exponent - 127)
VZ 2
Value = (-1)
Fig. 40: Data format of the measured value
Coding of the status byte associated with the PA output value
Status Description according to
code Profibus standard
0 x 00 bad - non-specific
0 x 04 bad - configuration error
0 x 0C bad - sensor failure
0 x 10 bad - sensor failure
0 x 1f bad - out of service constant
0 x 44 uncertain - last unstable value
0 x 48 uncertain substitute set
0 x 4c uncertain - initial value
0 x 51 uncertain - sensor; conversion
not accurate - low limited
0 x 52 uncertain - sensor; conversion
not accurate - high limited
0 x 80 good (non-cascade) - OK
0 x 84 good (non-cascade) - active
block alarm
0 x 89 good (non-cascade) - active ad-
visory alarm - low limited
0 x 8a good (non-cascade) - active ad-
visory alarm - high limited
0 x 8d good (non-cascade) - active crit-
ical alarm - low limited
VEGAPULS 63 • Profibus PA
Byte n+1
Bit
Bit Bit Bit Bit Bit Bit
0 7 4
6 5 3
2 2 -3
2 0 2 2 -2 2 -4
2 1 -1
Significant
(1 + Significant)
Possible cause
Flash-Update active
– Adjustment error
– Configuration error with PV-Scale (PV-Span too small)
– Unit irregularity
– Error in the linearization table
– Hardware error
– Converter error
– Leakage pulse error
– Trigger error
– Measured value generation error
– Temperature measurement error
"Out of Service" mode switched on
Failsafe replacement value (Failsafe-Mode = "Last value" and al-
ready valid measured value since switching on)
– Switch on simulation
– Failsafe replacement value (Failsafe-Mode = "Fsafe value")
Failsafe replacement value (Failsafe-Mode = "Last valid value" and
no valid measured value since switching on)
Sensor value < lower limit
Sensor value > upper limit
OK
Static revision (FB, TB) changed (10 sec. active, after the parame-
ter of the static category has been written)
Lo-Alarm
Hi-Alarm
Lo-Lo-Alarm
Byte n+2
Bit Bit Bit Bit
Bit Bit
7 4
6 5
0
2 1
2
2 2 -9 2 -10 -11 -12 -13 -14 -15 -16 -17
2 -8
2 2 -6 -7
-5
Significant
Bit Bit Bit Bit Bit
Bit Bit
0
3 2 1 7 6 5
2
2 2 2 2 2 2 -18 -19 -20 -21 -22 -23
10 Supplement
Byte n+3
Bit
Bit Bit Bit Bit
4
3 2 1
0
2 2 2 2
2
Significant
61