Sel 751A - Modbus Register Map; Reading History Data Using Modbus; Table E.32 Modbus Register Map

E.26
SEL-751A Relay Instruction Manual Date Code 20100129
Modbus RTU Communications
Modbus Register Map
Reading History Data
Using Modbus
Through use of the Modbus Register Map (Table E.32), you can download a
complete history of the last five 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 (1–5) to the
EVENT LOG SEL register at address 1747. 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 .32 ).
Modbus Register Map
Table E.32 lists the data available in the Modbus interface and its 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.32 Modbus Register Map
a
(Sheet 1 of 56)
Modbus Register
Address
b
Name/Enums Units Min Max Default
Scale
Facto r
DeviceNet
Parameter
Numbers
0(R) Reserved
c
0 100 1
User Map Register
1 (R/W) USER REG #1 610 1947 650 1 101
•
•
•
125 (R/W) USER REG #125 610 1947 1947 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
General Settings
261 (R/W) PHASE ROTATION 0 1 0 361
0 = ABC
1 = ACB
262 (R/W) RATED FREQ. Hz 0 1 1 1 362
0 = 50 Hz
1 = 60 Hz
263 (R/W) DATE FORMAT 0 2 0 1 363
0 = MDY
1 = YMD
2 = DMY
264 (R/W) EVE MSG PTS EN 0 32 0 1 364
0 = N, 1–32
Group Selection
265 (R/W) GRP CHG DELAY sec 0 400 3 1 365