Sel 551 - Page 258

G.22
SEL-551 Relay Instruction Manual Date Code 20110408
Modbus RTU Communications Protocol
Modbus RTU Communications Protocol
Bits 1–7 = 0
Bit 8 = 51Q2R
Bit 9 = 51Q1R
Bit 10 = 51G1R
Bit 11 = 51N1R
Bit 12 = 51P2R
Bit 13 = 51P1R
Bit 14 = CLOSE
Bit 15 = TRIP
008C Row 11
Bit 0 = 1 if any of
bits 8–15 are set
to 1
Bit 0 = 0 if all of
bits 8–15 are set
to 0
Bits 1–7 = 0
Bit 8 = SV12T
Bit 9 = SV11T
Bit 10 = SV10T
Bit 11 = SV9T
Bit 12 = SV8T
Bit 13 = SV7T
Bit 14 = SV6T
Bit 15 = SV5T
008D Row 12
Bit 0 = 1 if any of
bits 8–15 are set
to 1
Bit 0 = 0 if all of
bits 8–15 are set
to 0
Bits 1–7 = 0
Bit 8 = OUT4
Bit 9 = OUT3
Bit 10 = OUT2
Bit 11 = OUT1
Bit 12 = Alarm
Bit 13 = 0
Bit 14 = SV14T
Bit 15 = SV13T
Table G.18 Modbus Map (Sheet 10 of 15)
Address
(Hex)
Field Units
Range
Scale
Factor
Low High Step