Schweitzer Engineering Laboratories SEL-300G Instruction Manual page 675

Reading History Data Using Modbus
The Modbus Register Map, Table F.20, provides a feature that allows you to download the
complete history of the last 29 events via Modbus. The history contains the date and time stamp,
type of event that triggered the report, and the targets. Please refer to Note 8 of the Modbus Map
for a list of event types.
To download the history data using Modbus, write the event number (1–29) to address 02B1h.
Then read the history of the specific event number you requested from the Modbus Register
Map, Table F.20.
If the user selects a history number for which there is no data available, 8000h will be returned.
Address
Field
(Hex)
Relay ID
0000– FID
0016
0017– Revision
0019
001A– Relay ID
002D
002E– Terminal ID
004B
004C Reserved
004D Device Tag #
004E Feature Set ID
004F Reserved
Relay Status
0050 Channel IA offset value
0051 Channel IA status message
0=OK, 1=Warn, 2=fail
0052 Channel IB offset value
0053 Channel IB status message
0=OK, 1=Warn, 2=fail
0054 Channel IC offset value
0055 Channel IC status message
0=OK, 1=Warn, 2=fail
0056 Channel IN offset value
0057 Channel IN status message
0=OK, 1=Warn, 2=fail
0058 Channel VA offset value
0059 Channel VA status message
0=OK, 1=Warn, 2=fail
SEL-300G Instruction Manual
Modbus
Table F.20: Modbus Register Map
Units
ASCII string
(see Note 1)
ASCII string
(see Note 1)
ASCII string
(see Note 1)
ASCII string
(see Note 1)
(See Note 2)
15045
0
—
mV
—
mV
—
mV
—
mV
—
mV
—
®
RTU Communications Protocol
Range
Low High Step
— — —
— — —
— — —
— — —
— — —
— — —
— — —
— —
–5000 5000 1
— — —
–5000 5000 1
— — —
–5000 5000 1
— — —
–5000 5000 1
— — —
–5000 5000 1
— — —
Date Code 20020206
F-23
Scale
Factor
—
—
—
—
—
—
—
—
1
—
1
—
1
—
1
—
1
—