GE Industrial Solutions Entellisys 4.0 Integrator's Guide - Manual (Page 11)

PLC support 11
1.1.2.2 Bus Differential Flex Operand States
Each zone has 6 different states shown in Table 1-4 . Each one of them corresponds to a different bit
in the data item.
Table 1-4 Bus Differential status bit field
The zone states for all 4 relay instances span across 2 consecutive modbus registers as shown in
Table 1-3 . See PLC Interface (Read/Write) on page 110 for memory locations.
Table 1-5 Bus Differential status offsets
Bit Value
0 Trip Dropout
1 Alarm Dropout
2 Trip Pickup
3 Alarm Pickup
4 Trip Operated
5 Alarm Operated
6 Backup Trip Operated
Zone Number Register
Offset Bit Offset Notes
Zone 1 0 0
Zone 2 0 7
Zone 3 0 14 This zone’s information spans
over two adjacent registers
Zone 4 1 5
1 12 Bits from 12 thru 15 are not used
and shall always be set to 0