G.5
Date Code 20170927 Instruction Manual SEL-751 Relay
IEC 60870-5-103 Communications
Introduction to IEC 60870-5-103
Cause of Transmission
The Cause of Transmission (COT) represents the reason the SEL-751 sends a
message to the Master. See Tabl e G .6 for the possible COTs.
Information Number
The Information Number (INF) is one of the two octets of the information
object identifier. See Table G.7 for the range and description of Information
Numbers in IEC 60870-5-103.
Table G.6 IEC 60870-5-103 Cause Of Transmission
Cause of
Transmission
Description
1 Spontaneous Events
2 Cyclic
3 Reset Frame Count Bit (FCB)
4 Reset Communication Unit (CU)
5 Start/Restart
6Power On
7Test Mode
8 Time Synchronization
9 Initiation Of General Interrogation
10 Termination Of General Interrogation
12 Remote Operation
20 General Command (Control Direction), Positive Acknowledgment Of
Command (Monitor)
21 Negative Acknowledgment Of Command (Monitor)
31 Disturbance Recorder
40–44 Generic Commands And Data
Table G.7 IEC 60870-5-103 Information Numbers (Sheet 1 of 2)
Function Type Description
Monitor Direction
0–15 System Functions
16–31 Status
32–47 Supervision
48–63 Earth Fault
64–127 Short Circuit
128–143 Auto Reclose
144–159 Measurands
160–239 Not Used
240–255 Generic Functions
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