ABB RELION REX615 - IEC 60870-5-104 Overview; IEC 60870-5-104 Protocol; Standard Documentation; Communication Link Modes

2 IEC 60870-5-104 overview
2.1 IEC 60870-5-104 protocol
The IEC 60870-5-104 protocol standard is officially named “Network access for IEC
60870-5-101 using standard transport profiles”. The protocol is based on existing
IEC 61870-5-101 application and transport layer profiles while also including a
network link layer specification for Ethernet/TCP communication. Sometimes IEC
60870-5-104 is referred to as IEC 60870-5-101 over Ethernet/TCP.
2.2 Standard documentation
Table 1: Standard documentation
Document Description
IEC 60870-5-104: Network access for IEC
60870-5-101 using standard transport pro-
files.
This document includes combined defini-
tions of the application layer parts of IEC
60870-5-101 used by the 104 protocol and the
Ethernet TCP/IP transport functions used by
the 104 protocol.
IEC 60870-5-101: Companion standard for ba-
sic telecontrol task (incl. amendments).
This document includes the application layer
parts of the 101 standard which are used by
the IEC 60870-5-104 protocol.
IEC 60870-5-1 Transmission frame formats
IEC 60870-5-2 Link transmission procedures
IEC 60870-5-3 General Structure of applica-
tion data
IEC 60870-5-4 Definition and coding of appli-
cation data elements
IEC 60870-5-5 Basic application functions
IEC 60870-5-7 Transmission procedures, ex-
tension for secure communication
These documents include a detailed descrip-
tion of the protocol-related data and tasks.
2.3 Communication link modes
Two alternative communication link modes, unbalanced or balanced mode, are
available for the communication between the client (controlling station) and the
server (controlled station). In this case, since the IEC 60870-5-104 client establishes
separate TCP (point-to-point) connections towards each IEC 60870-5-104 server, the
balanced mode is the most commonly used.
2NGA001859 A
IEC 60870-5-104 overview
REX615
IEC 60870-5-104 Communication Protocol Manual
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