Sel SEL-787 - Modbus Register Map; Table E.34 Modbus Register Map

E.23
Date Code 20150130 Instruction Manual SEL-787 Relay
Modbus RTU Communications
Modbus Register Map
Reading History Data
Using Modbus
Through use of the Modbus Register Map (Table E.34), you can download a
complete history of the last fifty 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 1692 (when event number zero is
written by accident for the first time, the relay treats the selected event number
as one). 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
show the history data corresponding to the latest event. This information
updates dynamically. 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 stay frozen with that specific event history. These registers 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.
Instruction Manual
Modbus Register Map
Table E.34 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.34 Modbus Register Map
a
(Sheet 1 of 36)
Modbus Register
Address
b
Name / Enums Units Min Max Def
Scale
Fac tor
DeviceNet
Parameter
Numbers
0(R) Reserved
c
0 100 1
User Map Register
1 (R/W) USER REG #1 644 1249 684 1 101
•
•
•
125 (R/W) USER REG #125 644 1249 1249 1 225
User Map Reg Val
126–250
(R)
USER REG#1 VAL–USER REG#125
VA L
0 65535 0 1 226–350
251–259 (R) Reserved
c
0 0 0 351–359
Access Control
260 (R/W) BLOCK MODBUS SET 0 2 0 360
0 = NONE
1 = R_S
2 = ALL
General Settings
261 (R/W) PHASE ROTATION 0 1 0 361
0=ABC
1=ACB