VEGA VEGABAR 55 Profibus PA - Manual (Page 57)

57
10 Supplement
VEGABAR 55 • Profibus PA
36735-EN-130321
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. 35: Data format of the measured value
Coding of the status byte associated with the PA output value
Status
code
Description according to
Profibus standard
Possible cause
0 x 00 bad - non-specific Flash-Update active
0 x 04 bad - configuration error – Adjustment error
– Configuration error with PV-Scale (PV-Span too small)
– Unit irregularity
– Error in the linearization table
0 x 0C bad - sensor failure – Hardware error
– Converter error
– Leakage pulse error
– Trigger error
0 x 10 bad - sensor failure – Measured value generation error
– 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 al-
ready valid measured value since switching on)
0 x 48 uncertain substitute set – Switch on simulation
– 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 parame-
ter of the static category has been written)
0 x 89 good (non-cascade) - active ad-
visory alarm - low limited
Lo-Alarm
0 x 8a good (non-cascade) - active ad-
visory alarm - high limited
Hi-Alarm
0 x 8d good (non-cascade) - active crit-
ical alarm - low limited
Lo-Lo-Alarm
0 x 8e good (non-cascade) - active crit-
ical alarm - high limited
Hi-Hi-Alarm