12-10 8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
USING THE MEMORY MAP CHAPTER 12: ABOUT THE MODBUS MEMORY MAP
Table 12-7: Modbus Map entries, Element Status Register for Breaker Control Relays
The format code used for each Modbus register is listed in the Format Code column. In this
case, the format codes used are FE020 through FE026.
These format codes are described in the Format Code table as follows:
Table 12-8: Format Code entries, Element Status Register for Breaker Control Relays
NOTE:
From the notes preceding the full Format Code table, notice that Element Status Format
Codes (FE1 onwards) contain values that should be masked with 0x01FF to match the bit
field values shown in the table.
Element Status 20 monitors the state of the voltage monitor for Output Relay 1.
When the voltage is present on the Trip Contact voltage monitor (Von), the Element Status
20 register will read: 0x2002 (8194). The masked value is then 0x0002, corresponding to
Von in the preceding table.
When the voltage is not present on the Trip Contact voltage monitor (Voff), the Element
Status 20 register will read: 0x2004 (8196). The masked value is then 0x0004,
corresponding to Voff in the preceding table.
Element Status 21 monitors the state of the voltage monitor for Output Relay 2.
Modbus
Address
Hex
Address
Description Min Max Step Units Format
Code
Factory
Default
Size in
Words
8
5
0
8
6
9
8
8
9
8
4
5
30765 0x02FC Element Status 20 (Output Relay 1) 0 65535 1 FE020 0 Y Y Y Y
30766 0x02FD Element Status 21 (Output Relay 2) 0 65535 1 FE021 0 Y Y Y Y
30767 0x02FE Element Status 22 (Output Relay 3) 0 65535 1 FE022 0 Y Y Y Y
30768 0x02FF Element Status 23 (Output Relay 4) 0 65535 1 FE023 0 Y Y Y Y
30769 0x0300 Element Status 24 (Output Relay 5) 0 65535 1 FE024 0 Y Y Y Y
30770 0x0301 Element Status 25 (Output Relay 6) 0 65535 1 FE025 0 Y Y Y Y
30771 0x0302 Element Status 26 (Critical Fail) 0 65535 1 FE026 0 Y Y Y Y
Code Type Definition 850 869 889 845
FE020 unsigned 16 bits Element Status: Output Relay 1
0x0002 Von Y Y Y Y
0x0004 Voff Y Y Y Y
FE021 unsigned 16 bits Element Status: Output Relay 2
0x0002 Von Y Y Y Y
0x0004 Voff Y Y Y Y
FE022 unsigned 16 bits Element Status: Output Relay 3
0x0002 Von Y
0x0004 Voff Y
FE023 unsigned 16 bits Element Status: Output Relay 4
0x0002 Von Y
0x0004 Voff Y
FE024 unsigned 16 bits Element Status: Output Relay 5
0x0002 Von Y
0x0004 Voff Y
FE025 unsigned 16 bits Element Status: Output Relay 6
0x0002 Von Y
0x0004 Voff Y
FE026 unsigned 16 bits Element Status: Critical Fail
0x0002 Critical Fail OP Y Y Y Y
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