Vega VEGAFLEX 82 Operating Instructions Manual page 78

11 Supplement
The status byte corresponds to profile 3.02 "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
Bit Bit Bit Bit Bit Bit Bit
4
7 6 5 3 2
2
VZ 2 7 2 6 5 2 4 2 3
Sign
Exponent
Bit
VZ (Exponent - 127)
Value = (-1) 2
Fig. 39: Data format of the measured value
Coding of the status byte associated with the PA output value
You can find further information for the coding of the status byte in the Device Description 3.02 on
www.profibus.com.
Status code
0 x 00
0 x 04
0 x 0C
0 x 10
0 x 1f
0 x 44
0 x 48
0 x 4c
0 x 51
0 x 52
0 x 80
78
Byte n+1
Bit Bit
Bit Bit Bit Bit
0 4
1 7 6 5 3
2
2 2 0 2 2 -2 2 -3 2 -4
2 1 -1
Significant
(1 + Significant)
Description according to
Profibus standard
bad - non-specific
bad - configuration error
bad - sensor failure
bad - sensor failure
bad - out of service con-
stant
uncertain - last unstable
value
uncertain substitute set
uncertain - initial value
uncertain - sensor; con-
version not accurate - low
limited
uncertain - sensor; con-
version not accurate - high
limited
good (non-cascade) - OK
Byte n+2
Bit Bit
Bit Bit
Bit
Bit Bit
4
7 6 5
0
2 1
2 2 -9 2 -10 -11 -12 -13 -14 -15 -16 -17 2
2 2 -6 2 -7 -8
-5
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 val-
ue" and already 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
Bit
Bit Bit Bit Bit Bit Bit
0
3 2 1 7 6 5
2 2 2 2 2 -18 -19 -20 -21 -22 -23
2 2
VEGAFLEX 82 • Profibus PA
Byte n+3
Bit
Bit Bit Bit
Bit
4 3 2 1
0
2
2 2 2 2
Significant