GE Industrial Solutions Entellisys 5.0 Integrator's Guide - Manual (Page 31)

System Status 31
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2.1.9 Over (and Under) Frequency Operand States
Each breaker has 6 different states shown in Table 2-20 . Each one of them corresponds to a
different bit in the data item.
Table 2-20 Over Frequency status bit field
The breaker states for all 30 breakers span across 12 consecutive modbus registers as shown in
Table 2-21 . See Over Frequency Operand States (12 items) on page 136 and Under Frequency
Operand States (12 items) on page 136 for memory locations.
Table 2-21 Over Frequency status offsets
Bit Value
0 Alarm Pickup
1 Alarm Operated
2 Alarm Dropout
3 Trip Pickup
4 Trip Operated
5 Trip Dropout
Breaker Number Register
Offset Bit Offset Notes
Breaker 1 0 0
Breaker 2 0 6
Breaker 3 0 12 Spans over two registers
Breaker 4 1 2
... ... ...
Breaker 30 11 4