5 Operación
46
IEEE-745 número de coma decimal flotante
El valor de medida se transmite en forma de un número de coma decimal flotante IEEE
754, en el que
S
Vlaor de medida = (-1)
Byte 1
Bit 7
Bit 6 Bit5
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
7
6
5
2
2
2
2
Signo
(S)
Exponente (E)
Byte 3
Bit 7 Bit 6 Bit5
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
-8
-9
-10
-11
-12
2
2
2
2
2
Ejemplo
40 F0 00 00 (hex) = 0100 0000 1111 0000 0000 0000 0000 0000 (bin)
= (-1)
= 1 x 2
= 1 x 4 x 1.875
= 7.5
Levelflex M FMP 40 con PROFIBUS-PA
(E-127)
x 2
x (1+F)
4
3
2
1
0
2
2
2
2
-13
-14
-15
-16
2
2
2
2
Mantisa (F)
0
(129 - 127)
-1
x 2
x (1 + 2
+ 2
2
x (1 + 0.5 + 0.25 + 0.125)
Byte 2
-1
-2
-3
-4
-5
2
2
2
2
2
Mantisa (F)
Byte 4
-17
-18
-19
-20
-21
2
2
2
2
2
-2
-3
+ 2
)
Endress+Hauser
-6
-7
2
2
-22
-23
2
2