A-22 MIB High Impedance Bus Differntial Relay GEK-106426B
A.8 USED FORMATS APPENDIX A
A
A.8USED FORMATS’
Format F2, FLOAT 32 (INTEL) IEEE:
ANSI/IEEE Std 754-1985 IEEE Standard for Binary Floating-Point Arithmetic as Single format.
The equation defined by the standard is as follows:
Decimal value = (-1)
s
* 2
e - 127
* 1.m
In order to obtain s, e and m, we will explain an example:
If the data read in memory is: 33 F3 C7 42.
1º - Place the data with MSB first, and LSB at the end: 42 C7 F3 33
2º - Turn the number to binary:
0100 0010 1100 0111 1111 0011 0011 0011
3º - The first bit is s. In this case s=0
4º - The next 8 bits are e. In this case e=133
5º - The remaining bits are m. In this case m=100 0111 1111 0011 0011 0011 (In decimal, 0.565 approx)
(The weights of bits for calculating m are 0.5; 0.25; 0.125; 0.0625; 0.03125; 0.015625; 0.0078125....)
Therefore Decimal value = (-1)0 * 2133-127 * 1.565 = 100.16 Amps
FORMAT DESCRIPTION VALUE VALUETEXT
F1 DATE/TIME Milliseconds from 1/1/1996 at 00:00:00.000.
F2 FLOAT 32 (INTEL) IEEE (32 bits) Please refer to the example after this table.
F3/ARRAY TEXT
F4/BIT BIT
BIT Frequency 0 50 Hz
1 60 Hz
BIT Enable 0 Not permitted
1 Permitted
BIT States 0 Inactive
1Active
BIT Active group 0 Group 1
1Group 2
BIT Relay Status 0 Out of service
1In service
F5 INTEGER UNSIGNED 16 BIT
F6/
NUMBERED
INTEGER UNSIGNED 16 BIT –NUMBERED –
BAUDS
1 300
2 600
4 1200
8 2400
13 4800
32 9600
64 19200
F12 INTEGER SIGNED 16 BIT
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