18.6 IEC 60870-5-103 communication protocol
IP14615-1 v2
18.6.1 Application
IP14864-1 v1
M17109-3 v6
TCP/IP
Control Center
IED IEDIED
Gateway
Star coupler
Station HSI
IEC05000660-4-en.vsd
IEC05000660 V4 EN-US
Figure 210: 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 fibers and an opto/electrical converter for the PC/RTU, or a RS-485
connection depending on the used IED communication interface.
Functionality
M17109-38 v2
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 60870-5-103, refer to IEC60870 standard part 5:
Transmission protocols, and to the section 103, Companion standard for the informative
interface of protection equipment.
Design
M17109-41 v1
General
M17109-43 v2
The protocol implementation consists of the following functions:
• Event handling
• Report of analog service values (measurands)
• Fault location
• Command handling
Section 18 1MRK 511 358-UEN A
Station communication
424
Application manual
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