DCS ADR24 Instructions d'exploitation Page 20

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20 VEGASON 51P 53P
Technical data
3.3 Data format of the output signal
Byte4 Byte3 Byte2 Byte1 Byte0
Status Meas. value (IEEE-754 format, see below)
Status byte:
The status byte corresponds to the profile 3.0 "Profibus PA Profile for Process Control De-
vices coded. The status "Meas. value OK is coded as 80 (hex) (Bit7 = 1, Bit 6 0 = 0).
Meas. value:
The meas. value is transferred as a 32 Bit floating point number in IEEE-754 format.
Byte n Byte n+1
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
7654321076543210
VZ 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
Sign
Exponent Mantissa
Byte n+2 Byte n+3
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
7654321076543210
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
Mantissa Mantissa
Formula: Meas. value = (-1)
VZ
2
(Exponent - 127)
(1 + Mantissa)
Examples: 41 70 00 00 (hex) = 0100 0001 0111 0000 0000 0000 0000 0000 (bin)
Meas. value = (-1)
0
2
(130 - 127)
(1 + 2
-1
+ 2
-2
+ 2
-3
)
= 1 2
3
(1 + 0.5 + 0.25 + 0.125)
= 1 8 1.875
= 15.0
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