4 - 58 750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
DATA FORMATS CHAPTER 4: MODBUS MEMORY MAP
F50
Polarization
0Voltage
1 Current
2Dual
F51
A100 Self-Test Errors
0001h +32V Analog Out Volt Monitor (0 = OK, 1 = Fail)
0002h +32V Switch In Volt Monitor (0 = OK, 1 = Failed)
0004h Real Time Clock (0 = OK, 1 = Unable to Start)
0008h Not Used
0010h EEPROM Failure (0 = OK, 1 = Failed)
0020h Internal Temperature (-40 to 70 °C) (0 = OK, 1= Out of Range)
0040h A/D Virtual Ground (0 = OK, 1 = Out of Spec)
0080h Not Calibrated (0 = OK, 1 = Not Calibrated)
0100h
7
Not Used
8000h Prototype Unit (0 = OK, 1 = Installed)
F52
2's Complement Signed Value,
2 Decimal Places
Distance to Fault
Example: -12.34 stored as -1234. Note: a value of 327.67 indicates that the distance could not be
calculated.
F53
Unsigned Value, 2 Decimal Places - Line Z1 to Fault
Example: 12.34 stored as 1234. Note: a value of 655.35 indicates that the impedance could not be
calculated
F54
Force LED State
0001h LED #1 (Top) (0 = Off, 1 = On)
0002h LED #2 (0 = Off, 1 = On)
0004h LED #3 (0 = Off, 1 = On)
0008h LED #4 (0 = Off, 1 = On)
0010h LED #5 (0 = Off, 1 = On)
0020h LED #6 (0 = Off, 1 = On)
0040h LED #7 (0 = Off, 1 = On)
0080h LED #8 (Bottom) (0 = Off, 1 = On)
Table 4: Data Formats (Sheet 13 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.
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