Vega VEGAPULS 66 Operating Instructions Manual page 61
Standpipe version profibus pa sensor for continuous level measurement of liquids under arduous process conditions
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Also See for VEGAPULS 66:
- Operating instructions manual (88 pages) ,
- Quick setup manual (24 pages) ,
- Safety manual (16 pages)
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Byte-No.
1
2
IEEE-754-
Format
Floating point value
Value
PA-OUT
Data format of the output signal
Byte2 Byte1 Byte0
Byte4 Byte3
Status
Value (IEEE-754)
Fig. 25: Data format of the output signal
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
Bit
Bit
Bit
Bit
Bit
Bit
7
6
5
4
3
2
7
4
6
2
5
VZ
2
2
2
2
Sign
Exponent
Bit
(Exponent - 127)
VZ
Value = (-1)
2
Fig. 26: Data format of the measured value
Coding of the status byte associated with the PA output value
VEGAPULS 66 standpipe version - Profibus PA
3
4
5
Status
Status
(FB1)
(FB1)
Note:
Bytes 6-10 are not used in this example.
Byte n+1
Bit
Bit
Bit
Bit
Bit
Bit
Bit
1
0
7
4
6
5
3
-3
3
2
2
1
0
-1
-2
2
-4
2
2
2
2
2
Significant
(1 + Significant)
Byte n+2
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
7
4
6
5
0
2
1
-10 -11 -12 -13 -14 -15 -16 -17
-9
2
-8
2
2
2
-5
-6
2
-7
2
2
Significant
Byte n+3
Bit
Bit
Bit
Bit
Bit
Bit
Bit
0
4
3
2
1
7
6
5
-18 -19 -20 -21 -22 -23
2
2
2
2
2
2
2
2
Significant
Supplement
Bit
Bit
Bit
Bit
3
2
1
0
2
2
2
2
61
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