EN
31/70
∫
RCF
Description:
∫
RCF/RZB : float-number
Format according to IEEE-754-Standard
(coded by 32 Bit)
The complete information has to be determined by the ENQUIRY of
two
parameters
Parameter-No.: 00609
∫
RCF/RZB 1
st
Word MSW
Gen. 1 + 2
Access:
R
Structure:
MSD LSD MSD LSD
∫
RCF LSB
∫
RCF MSB
31--------------------Bit-------------------16
Parameter-No.: 00610
∫
RCF/RZB 2
nd
Word MSW
Gen. 1 + 2
Access:
R
Structure:
MSD LSD MSD LSD
∫
RCF LSB
∫
RCF MSB
15---------------------Bit--------------------0
!! There are only values, therefore bit 31 is always 0 !!
Bit 31
: sign ( 0 = positive, 1=negativ )
Bit 30...23
: Exponent ( two’s complement with offset 127
dezimal
)
Bit 23 = 2
0
Bit 24 = 2
1
Bit 25 = 2
2
Bit 26 = 2
3
Bit 27 = 2
4
Bit 28 = 2
5
Bit 29 = 2
6
Bit 30 = 2
7
Bit 22...0
: normalised mantissa ( range 1...2 )
Number 1 always exist and is not stored as a Bit.
Bit 22 = 2
-1
= 0.5
Bit 21 = 2
-2
= 0.25
Bit 20 = 2
-3
= 0.125
Bit 19 = 2
-4
= 0.0625
etc
Bit 0 = 2
-23
Commutation formula:
X = (-1)
sign
* Mantissa * 2
Exponent -127
