G.3
Date Code 20170927 Instruction Manual SEL-751 Relay
IEC 60870-5-103 Communications
Introduction to IEC 60870-5-103
Data Handling
Master/Slave Communication
The IEC 60870-5-103 standard is such that the IED only sends a message
when the Master asks for it. Communication is set up by the Master and the
Master controls the communication between the Master and the IED.
Interoperability
The method of data exchange in the SEL-751 involves Application Service
Data Units (ASDUs) along with application procedures for transmission of
standardized data messages (see Tabl e G.4 ). The data are recognized by any
IEC 60870-5-103 Master because the application data take the form of an
IEC 60870-5-103 data type and pairs with an IEC 60870-5-103 address,
resulting in device interoperability.
Table G.5 lists the available category map settings in the SEL-751. When
configuring the settings with the command line, categories can be selected by
entering “>” or “<”.
Table G.4 SEL-751 ASDU Types
ASDU Type Description
1 Time Tagged Message
2 Time Tagged Message With Relative Time
4 Time Tagged Measurands With Relative Time
5 Identification
6 Time Synchronization
7 General Interrogation Start
8 General Interrogation Termination
9 Measurands II
20 General Command
205 Non-Standard (defined below)
Type Identification 0xCD (205)
Variable Structure Qualifier 0x81
Cause of Transmission 0x01
Device Address ADDR
Function Type FUN
Information Number INF
Information Element Meter
value: 29-bit signed integer
ER: 0 valid, 1 invalid
2
7
••••••2
0
2
15
••••••2
8
2
23
••••••2
16
0ER0–2
28
•••2
24
Four Octet Binary Time Defined in 60870-5-103, 7.2.6.28
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