Schweitzer Engineering Laboratories SEL-700G Series, Instruction Manual

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E.25 Modbus RTU Communications
Modbus Register Map
Date Code 20170814 Instruction Manual SEL-700G Relay
Reading History Data
Using Modbus
Using the Modbus Register Map (Table E.34), you can download a complete
history of the last 50 events via Modbus. The history contains the date and
time stamp, type of event that triggered the report, currents, and voltages at the
time of the event. Please refer to the Historical Data section in the map.
To use Modbus to download history data, write the event number (1–50) to the
EVENT LOG SEL register at address 819. Then read the history of the
specific event number you requested from the registers shown in the
Historical Data section of the Modbus Register Map (Table E.34). After a
power cycle, the history data registers will show the history data
corresponding to the latest event. This information updates dynamically; as
whenever there is a new event, the history data registers update automatically
with new event data. If specific event number data have been retrieved using a
write to the EVENT LOG SEL register, the event data registers will stay
frozen with that specific event history. These registers will return to the free
running latest event history data mode when a zero is written to the event
selection register from a prior nonzero selection.
Modbus Register Map
Instruction Manual
Table E.34 lists the data available in the Modbus interface and a data
description, range, and scaling information. The table also shows the
parameter number for access using the DeviceNet interface. The DeviceNet
parameter number is obtained by adding 100 to the Modbus register address.
Table E.34 Modbus Register Map
a
(Sheet 1 of 28)
Modbus Register
Address
b
Name/Enums Units Min Max Default
Scale
Factor
DeviceNet
Parameter
Numbers
0 (R) Reserved
c
0 100 1
User Map Reg
1 (R/W) USER REG #1 271 1124 1124 1 101
•
•
•
125 (R/W) USER REG #125 271 1124 1124 1 225
User Map Register Values
126 (R) USER REG#1 VAL 0 65535 0 1 226
•
•
•
250 (R) USER REG#125 VAL 0 65535 0 1 350
Reserved Area 1
251–260 (R) Reserved
c
0 0 0 351–360
Reset Settings
261 (R/W) RESET DATA 0 4095 0 361
Bit 0 = TRIP RESET
Bit 1 = Reserved
Bit 2 = RESET STAT DATA
Bit 3 = RESET HIST DATA
Bit 4 = RESET COMM CNTR
Bit 5 = Reserved
Bit 6 = RST ENRGY DATA
Bit 7 = RST MX/MN DATA