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750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
DATA FORMATS
CHAPTER 4: MODBUS MEMORY MAP
9.
These registers are new or have changed for version 3.70
10. These registers are new or have changed for version 7.00
11. These registers are new or have changed for version 7.40
12. These registers support compatibility with version 7.31 and previous. Floating point
format in registers 2270 to 2287 provides more precise values.
13. The ADDR 000C register, Installed Option: Harsh Environment, has changed for version
7.43 in relays manufactured after February 2014.
With earlier firmware or manufacture date, ADDR 000C always reads as value 0.
14. These registers have changed for version 7.47. From version 7.47 onwards, relay
response to read request is data value "00000000".
Data Formats
Table 4: Data Formats (Sheet 1 of 20)
Type
Value
Description
F1
Unsigned Value (16 bits)
Example: 1234 stored as 1234
F2
Unsigned Value, 1 Decimal Place (16 bits)
Example: 123.4 stored as 1234
F3
Unsigned Value, 2 Decimal Places (16 bits)
Example: 12.34 stored as 1234
F4
2's Complement Signed Value
(16 bits)
Example: -1234 stored as -1234
F5
2's Complement Signed, 1 Decimal Place (16 bits)
Example: -123.4 stored as -1234
F6
2's Complement Signed, 2 Decimal Places (16 bits)
Example: -12.34 stored as -1234
F7
Unsigned Long Value (32 bits)
High order word of long value stored in 1st 16 bits; low order word of long value stored in 2nd 16 bits
Example: 123456 stored as 123456
F8
Unsigned Long Value, 1 Decimal Place (32 bits)
High order word of long value stored in 1st 16 bits; low order word of long value stored in 2nd 16 bits
Example: 12345.6 stored as 123456
F9
Unsigned Long Value, 2 Decimal Places (32 bits)
High order word of long value stored in 1st 16 bits; low order word of long value stored in 2nd 16 bits
Example: 1234.56 stored as 123456
F10
2's Complement Signed Long Value (32 bits)
High order word of long value stored in 1st 16 bits
Low order word of long value stored in 2nd 16 bits
Example: -123456 stored as -123456
F11
2's Complement Signed Long Value, 1 Decimal Place (32 bits)
High order word of long value stored in 1st 16 bits
Low order word of long value stored in 2nd 16 bits
Example: -12345.6 stored as -123456
F12
2's Complement Signed Long Value, 2 Decimal Places (32 bits)
High order word of long value stored in 1st 16 bits
Low order word of long value stored in 2nd 16 bits
Example: -1234.56 stored as -123456
1 2 3 4 5 6 7 8 9 10 11 12 13
For explanation of footnotes, see notes of end of Table.