21.5 IEC 60870-5-103 communication protocol
21.5.1 Application
TCP/IP
Control
Center
IED IEDIED
Gateway
Star coupler
Station
HSI
ANSI05000660-4-en.vsd
ANSI05000660 V4 EN
Figure 410: Example of IEC 60870-5-103 communication structure for a substation
automation system
IEC 60870-5-103 communication protocol is mainly used when a protection IED
communicates with a third party control or monitoring system. This system must have
software that can interpret the IEC 60870-5-103 communication messages.
When communicating locally in the station using a Personal Computer (PC) or a Remote
Terminal Unit (RTU) connected to the Communication and processing module, the only
hardware needed is optical fibres and an opto/electrical converter for the PC/RTU, or a
RS-485 connection depending on the used IED communication interface.
21.5.1.1 Functionality
IEC 60870-5-103 is an unbalanced (master-slave) protocol for coded-bit serial
communication exchanging information with a control system. In IEC terminology a
primary station is a master and a secondary station is a slave. The communication is based
on a point-to-point principle. The master must have software that can interpret the IEC
60870-5-103 communication messages. For detailed information about IEC
1MRK 506 369-UUS - Section 21
Station communication
Line distance protection REL670 2.2 ANSI 873
Application manual
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