GE Multilin 745 Communications Manual page 98

MODBUS PROTOCOL
2–92
F88: Assert signal (16-bit enumeration)
Value Assert signal
0 Disabled
1 Logic input 1
2 Logic input 2
3 Logic input 3
4 Logic input 4
5 Logic input 5
6 Logic input 6
7 Logic input 7
8 Logic input 8
F89: Low voltage winding rating (16-bit enumeration)
Value Rating
0 above 5 kV
1 1 to 5 kV
2 below 1 kV
F90: Unsigned value, auto-ranging voltage / rated load / minimum tap voltage (16 bits)
For low voltage winding rating ≥ 5 kV, F90 is an unsigned value with one decimal place. For
example, 123.4 is stored as 1234.
For 1 kV ≤ low voltage winding rating < 5 kV, F90 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For low voltage winding rating < 1 kV, F90 is an unsigned value with three decimal places.
For example, 1.234 is stored as 1234.
F91: Unsigned value, auto-ranging voltage increment per tap (16 bits)
For low voltage winding rating ≥ 5 kV, format F91 is an unsigned value with two decimal
places. For example, 12.34 is stored as 1234.
For 1 kV ≤ low voltage winding rating < 5 kV, format F91 is an unsigned value with three
decimal places. For example, 1.234 is stored as 1234.
For low voltage winding rating < 1 kV, format F91 is an unsigned value with four decimal
places. For example, 0.1234 is stored as 1234.
F92: Harmonic number (16-bit enumeration)
Value Harmonic
0 2nd harmonic
1 3rd harmonic
2 4th harmonic
3 5th harmonic
4 6th harmonic
5 7th harmonic
6 8th harmonic
For the following three Format Codes - F93, F94, and F95 - a "Low MVA Transformer" is
defined as shown in the table below:
Low Voltage Winding Rating
<1 kV
1 to 5 kV
>5 kV
Value Assert signal
9 Logic input 9
10 Logic input 10
11 Logic input 11
12 Logic input 12
13 Logic input 13
14 Logic input 14
15 Logic input 15
16 Logic input 16
Value Harmonic
7 9th harmonic
8 10th harmonic
9 11th harmonic
10 12th harmonic
11 13th harmonic
12 14th harmonic
13 15th harmonic
Low MVA Transfomer defined as less than:
0.1 MVA
1.0 MVA
10.0 MVA
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL
Value Harmonic
14 16th harmonic
15 17th harmonic
16 18th harmonic
17 19th harmonic
18 20th harmonic
19 21st harmonic