CHAPTER 4: MODBUS MEMORY MAP
DATA FORMATS NOTES
750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
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Data Formats Notes
1.
New for version 2.10
2.
Changed from version 2.00 to 2.10
3.
New or changed for version 3.00
4.
New or changed for version 3.20
5.
New for version 3.30
6.
New for version 3.31 MOD 010
7.
New or changed for version 3.60
8.
New or changed for version 3.70
9.
New or changed for version 4.00
10. New for version 7.00
11. New for version 7.40
12. To read a date, read two 16-bit values and interpret these two values using format
F23. The first value provides the month and day and the second value provides the
year.
To read a time, read two 16-bit values and interpret these two values using format
F22. The first value provides the hours and minutes and the second value provides the
milliseconds.
F95
11
Floating Point (32 bits)
IEEE 754 single precision binary floating-point format: binary32.
The first modbus address contains the sign bit, exponent, and 7 most significant bits of the fraction.
The second modbus address contains the 16 least significant bits of the fraction.
F96
13
Order code: Harsh Environment option
0x000
No indication.
0x002A
No conformal coating.
0x0055
Indicates conformal coating for harsh environment.
0x00FF
No indication.
Other values
Reserved for future use.
Table 4: Data Formats (Sheet 20 of 20)
Type
Value
Description
1 2 3 4 5 6 7 8 9 10 11 12 13
For explanation of footnotes, see notes of end of Table.
Table 5: Example Date and Time Interpretation
Example
Modbus
Address
Format
Example Value
(hexadecimal)
Interpretation
Result
Date of
last trip
02E0
F23 first 16 bits
081D
Month = 08
Day = 1D
August 29
02E1
F23 second 16 bits 07DD
Year = 07DD
2013
Time of
last trip
02E2
F22 first 16 bits
0F3B
Hour = 0F
Minute = 3B
3:59 pm
02E3
F22 second 16 bits 87CC
Milliseconds = 87CC 34.764 seconds