Section 3: Iec 60870-5-103 Definitions; Introduction - Siemens 7SR224 Technical Manual

Section 3: IEC 60870-5-103 Definitions

3.1

Introduction

This section describes the IEC 60870-5-103 protocol implementation in the relays. This protocol is used for the
communication with Reydisp software and can also be used for communication with a suitable control system.
The control system or local PC acts as the master in the system with the relay operating as a slave responding to
the master's commands. The implementation provides event information, time synchronising, commands and
measurands and also supports the transfer of disturbance records.
This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic RS232 and RS485)
and is the standard protocol used by the USB port. The relay can communicate simultaneously on all ports
regardless of protocol used.
Each relay must be given an address to enable communication and can be set by the Communication
Interface:Relay Address. A relay with the default address of 0 will not be able to communicate.
Cause of Transmission
The cause of transmission (COT) column of the 'Information Number and Function' table lists possible causes of
transmission for these frames. The following abbreviations are used:
Abbreviation Description
SE spontaneous event
T test mode
GI general interrogation
Loc local operation
Rem remote operation
Ack command acknowledge
Nak Negative command acknowledge
Note: Events listing a GI cause of transmission can be raised and cleared; other events are raised only.
Function Type
Abbreviation Description
1 Time tagged message (monitor direction)
2 Time tagged message (relative time) (monitor direction)
3.1 Measurands I
4 Time-tagged measurands with relative time
5 Identification message
6 Time synchronisation
7 General Interrogation Initialization
9 Measurands II
20 General command
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7SR224 Argus Data Comms
Chapter 4 Page 12 of 76