GE Multilin 745 Communications Manual page 96

MODBUS PROTOCOL
2–90
F79: Unsigned value, auto-ranging based on winding 2 phase CT primary value (16 bits)
For winding 2 phase CT primary ≤ 2 A, F79 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
For 2 A < winding 2 phase CT primary ≤ 20 A, F79 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 20 A < winding 2 phase CT primary ≤ 200 A, F79 is an unsigned value with one decimal
place. For example, 123.4 is stored as 1234.
For 200 A < winding 2 phase CT primary ≤ 2000 A, F78 is a standard unsigned value. For
example, 1234 is stored as 1234.
For winding 2 phase CT primary > 2000 A, F78 is a standard unsigned value scaled by 10.
For example, 12340 is stored as 1234.
F80: Unsigned value, auto-ranging based on winding 3 phase CT primary value (16 bits)
For winding 3 phase CT primary ≤ 2 A, F80 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
For 2 A < winding 3 phase CT primary ≤ 20 A, F80 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 20 A < winding 3 phase CT primary ≤ 200 A, F80 is an unsigned value with one decimal
place. For example, 123.4 is stored as 1234.
For 200 A < winding 3 phase CT primary ≤ 2000 A, F78 is a standard unsigned value. For
example, 1234 is stored as 1234.
For winding 3 phase CT primary > 2000 A, F78 is a standard unsigned value scaled by 10.
For example, 12340 is stored as 1234.
F81: Unsigned value, auto-ranging based on winding 1 ground CT primary (16 bits)
For winding 1 ground CT primary ≤ 2 A, F81 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
For 2 A < winding 1 ground CT primary ≤ 20 A, F81 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 20 A < winding 1 ground CT primary ≤ 200 A, F81 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 1 ground CT primary > 200 A, F81 is a standard unsigned value. For example,
1234 is stored as 1234.
F82: Unsigned value, auto-ranging based on winding 2 ground CT primary (16 bits)
For winding 2 ground CT primary ≤ 2 A, F82 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
For 2 A < winding 2 ground CT primary ≤ 20 A, F82 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 20 A < winding 2 ground CT primary ≤ 200 A, F82 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 2 ground CT primary > 200 A, F82 is a standard unsigned value. For example,
1234 is stored as 1234.
F83: Unsigned value, auto-ranging based on winding 3 ground CT primary (16 bits)
For winding 3 ground CT primary ≤ 2 A, F83 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
For 2 A < winding 3 ground CT primary ≤ 20 A, F83 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 20 A < winding 3 ground CT primary ≤ 200 A, F83 is an unsigned value with one
decimal place. For example, 123.4 is stored as 1234.
For winding 3 ground CT primary > 200 A, F83 is a standard unsigned value. For example,
1234 is stored as 1234.
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL