GE Multilin 745 Communications Manual page 78

MODBUS PROTOCOL
2–72
F24: Event type and cause (16-bit enumeration)
First block of four bits (0000 ---- ---- ----): type of event, enumerated as follows:
Value Bit arrangement
0 0000 –––– –––– ––––
1 0001 –––– –––– ––––
2 0010 –––– –––– ––––
3 0011 –––– –––– ––––
4 0100 –––– –––– ––––
5 0101 –––– –––– ––––
6 0110 –––– –––– ––––
Second block of twelve bits (---- 0000 0000 0000): cause of event, enumerated as follows:
Value Bit arrangement
0 –––– 0000 0000 0000
1 –––– 0000 0000 0001
2 –––– 0000 0000 0010
3 –––– 0000 0000 0011
4 –––– 0000 0000 0100
5 –––– 0000 0000 0101
6 –––– 0000 0000 0110
7 –––– 0000 0000 0111
8 –––– 0000 0000 1000
9 –––– 0000 0000 1001
10 –––– 0000 0000 1010
11 –––– 0000 0000 1011
12 –––– 0000 0000 1100
13 –––– 0000 0000 1101
14 –––– 0000 0000 1110
15 –––– 0000 0000 1111
16 –––– 0000 0001 0000
17 –––– 0000 0001 0001
18 –––– 0000 0001 0010
19 –––– 0000 0001 0011
20 –––– 0000 0001 0100
21 –––– 0000 0001 0101
22 –––– 0000 0001 0110
23 –––– 0000 0001 0111
24 –––– 0000 0001 1000
25 –––– 0000 0001 1001
26 –––– 0000 0001 1010
27 –––– 0000 0001 1011
28 –––– 0000 0001 1100
29 –––– 0000 0001 1101
30 –––– 0000 0001 1110
31 –––– 0000 0001 1111
32 –––– 0000 0010 0000
33 –––– 0000 0010 0001
34 –––– 0000 0010 0010
Event type
None
Off
On
Pickup
Operate
Dropout
Error
Cause of event
No event
Percent differential
Instantaneous differential
Winding 1 phase time overcurrent
Winding 2 phase time overcurrent
Winding 3 phase time overcurrent
Winding 1 phase instantaneous overcurrent 1
Winding 2 phase instantaneous overcurrent 1
Winding 3 phase instantaneous overcurrent 1
Winding 1 phase instantaneous overcurrent 2
Winding 2 phase instantaneous overcurrent 2
Winding 3 phase instantaneous overcurrent 2
Winding 1 neutral time overcurrent
Winding 2 neutral time overcurrent
Winding 3 neutral time overcurrent
Winding 1 neutral instantaneous overcurrent 1
Winding 2 neutral instantaneous overcurrent 1
Winding 3 neutral instantaneous overcurrent 1
Winding 1 neutral instantaneous overcurrent 2
Winding 2 neutral instantaneous overcurrent 2
Winding 3 neutral instantaneous overcurrent 2
Winding 1 ground time overcurrent
Winding 2 ground time overcurrent
Winding 3 ground time overcurrent
Winding 1 ground instantaneous overcurrent 1
Winding 2 ground instantaneous overcurrent 1
Winding 3 ground instantaneous overcurrent 1
Winding 1 ground instantaneous overcurrent 2
Winding 2 ground instantaneous overcurrent 2
Winding 3 ground instantaneous overcurrent 2
Winding 1 restricted ground fault
Winding 2 restricted ground fault
Winding 3 restricted ground fault
Winding 1 restricted ground trend
Winding 2 restricted ground trend
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL