GE 750 Manual page 75

CHAPTER 4: MODBUS MEMORY MAP
750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
Table 4: Data Formats (Sheet 10 of 20)
Type Value
2's Complement Signed Value
To convert phase currents to Amps, multiply by 'Phase CT Primary' and divide by 1000. To convert
F25
ground current to Amps, multiply by 'Ground CT Primary' and divide by 1000. To convert sensitive
ground current to Amps, multiply by 'Sensitive Ground CT Primary' and divide by 10000. To convert to
voltages to Volts, multiply by 'VT Ratio', multiply by 'VT Secondary Voltage' and divide by 1000.
Trace Memory Channel Selector
The contents of the Trace Memory Samples depends on the value contained in the Trace Memory
Channel Selector as follows:
0 Phase A Current (Format F25)
1 Phase B Current (Format F25)
2 Phase C Current (Format F25)
3 Ground Current (Format F25)
F26
4 A-N (A-B) Voltage (Format F25)
5 B-N Voltage (Format F25)
6 C-N (C-B) Voltage (Format F25)
7 Line Voltage (Format F25)
8 Output Relay States (Format F40)
9 Logic Input States (Format F46)
3
Sensitive Ground Current (Format F25)
10
Communications Parity
0 None
F27
1 Odd
2 Even
VT Connection Type
0 None
F28
1 Wye
2 Delta
760 Operation
F29 0 Not Ready
1 Ready
Enabled/Disabled
F30 0 0 = Disabled
1 1 = Enabled
Baud Rate
0 300 Baud
1 1200 Baud
F31 2 2400 Baud
3 4800 Baud
4 9600 Baud
5 19200 Baud
Default Message
F32
Internally Defined
ASCII Text Characters
F33 00FFh Second ASCII Character
FF00h First ASCII Character
Relay Non-operated State
F34 0 De-energized
1 Energized
Relay Output Type
0 Self-Resetting
F35
1 Latched
2 Pulsed
1 2 3 4 5 6 7 8 9 10 11 12 13
For explanation of footnotes, see notes of end of Table.
DATA FORMATS
Description
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