Dwyer UXF3 User Manual
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(3) 64-bit floating data (double type)
Instantaneous values or the like are expressed by 64-bit double precision float type.
The meaning of each bit is as follows (standard format specified in IEEE).
1) Sign part
Indicates the sign of the floating decimal point. “0” represents “positive”, and “1” represents “negative”.
2) Exponent part
Indicates the exponent of the floating decimal point by a power of 2. The value obtained by subtracting
1023 from this value is the actual exponent.
3) Significand part
This is the data that corresponds to the significant figure of the floating decimal point. The actual
numerical value is interpreted by adding 1 to the top.
Example: 0 01111111111 1110000000000000000000000000000000000000000000000000
Sign
: Plus
Exponent
:
01111111111
(2)
1023 = 0
Significand
:
1.111
(2)
= 1 + 1/2 + 1/4 + 1/8 = 1.875
Value
:
1.875
u (0th power of 2) = 1.875
7.1.3
Handling of measured data on occurrence of range over
Even if the measured data (instantaneous value) is in excess of the scale range, the measured data (velocity or flow
rate) is transmitted as it is as the instantaneous value Read-out data.
63 62
52 51
0
Sign part
Exponent part (8 bits)
Significand part (23 bits)
Bulletin F-107-UXF3-S