Sel 551 - Table G.17 Assign Event Report Channel Using Address 00 B2; Table G.18 Modbus Map

G.13
Date Code 20110408 Instruction Manual SEL-551 Relay
Modbus RTU Communications Protocol
Modbus RTU Communications Protocol
If the user selects an event number for which there are no data available,
8000h will be returned.
Reading History Data
Using Modbus
The Modbus Register Map (Table G.18) provides a feature that allows you to
download complete history of the last 20 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 3 of the Modbus Map for a list of event types.
To download the history data using Modbus, write the event number (1–20) to
address 00A1h. Then read the history of the specific event number you
requested from the Modbus Map (Table G.18).
If the user selects a history number for which there are no data available,
8000h will be returned.
Table G.17 Assign Event Report Channel Using Address 00B2
Set 00B2 To Read Data From Channel
1IA
2IB
3IC
4IN
5IG
6 Relay Element Status Row 1
a
a
Please refer to Tab le 5 . 6 to obtain the contents of each relay element status row. Relay
Element Status Row 0, which represents targets, is displayed at 00FB in the Modbus Map.
7 Relay Element Status Row 2
a
8 Relay Element Status Row 3
a
9 Relay Element Status Row 4
a
10 Relay Element Status Row 5
a
11 Relay Element Status Row 6
a
12 Relay Element Status Row 7
a
13 Relay Element Status Row 8
a
14 Relay Element Status Row 9
a
15 Relay Element Status Row 10
a
16 Relay Element Status Row 11
a
17 Relay Element Status Row 12
a
18 Relay Element Status Row 13
a
Table G.18 Modbus Map (Sheet 1 of 15)
Address
(Hex)
Field Units
Range
Scale
Factor
Low High Step
Relay ID
0000–0016 FID
a
ASCII
String
––––
0017–0019 Revision
a
ASCII
String
––––
001A–0022 Relay ID
a
ASCII
String
––––
0023–002B Terminal ID
a
ASCII
String
––––