Sel 551 - Page 254

G.18
SEL-551 Relay Instruction Manual Date Code 20110408
Modbus RTU Communications Protocol
Modbus RTU Communications Protocol
Bit 11 = Phase C
51/50
Bit 12 = Phase B
51/50
Bit 13 = Phase A
51/50
Bit 14 = Inst.
Bit 15 = Enable
0081 Contact Status
Bit 0 = 1 if any of
bits 1–15 are set
to 1
Bit 0 = 0 if all of
bits 1–15 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 = IN2
Bit 14 = IN1
Bit 15 = 0
0082 Row 1
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 = 51G1T
Bit 9 = 51N1T
Bit 10 = 51P2T
Bit 11 = 51P1T
Bit 12 = 51G1
Bit 13 = 51N1
Bit 14 = 51P2
Bit 15 = 51P1
0083 Row 2
Bit 0 = 1 if any of
bits 8–15 are set
to 1
Table G.18 Modbus Map (Sheet 6 of 15)
Address
(Hex)
Field Units
Range
Scale
Factor
Low High Step