7 IEC 60870-5-103
The specification IEC 60870-5-103 (Telecontrol Equipment and Systems Part 5 Section 103: Transmission
Protocols), defines the use of standards IEC
60870-5-1 to IEC 60870-5-5, which were designed for
communication with protection equipment
This section describes how the IEC 60870-5-103 standard is applied to the Px40 platform. It is not a
description of the standard itself. The level at which this section is written assumes that the reader is already
familiar with the IEC 60870-5-103 standard.
This section should provide sufficient detail to enable understanding of the standard at a level required by
most users.
The IEC 60870-5-103 interface is a master/slave interface with the device as the slave device. The device
conforms to compatibility level 2, as defined in the IEC 60870-5-103.standard.
The following IEC 60870-5-103 facilities are supported by this interface:
● Initialization (reset)
● Time synchronization
● Event record extraction
● General interrogation
● Cyclic measurements
● General commands
● Disturbance record extraction
● Private codes
7.1 PHYSICAL CONNECTION AND LINK LAYER
Two connection options are available for IEC 60870-5-103:
● Rear Port 1 (RP1) - for permanent SCADA connection via RS485
● Optional fibre port (RP1 in slot A) - for permanent SCADA connection via optical fibre
If the optional fibre optic port is fitted, a menu item appears in which the active port can be selected.
However the selection is only effective following the next power up.
The IED address and baud rate can be selected using the front panel menu or by the settings application
software.
7.2 INITIALISATION
Whenever the device has been powered up, or if the communication parameters have been changed a reset
command is required to initialize the communications. The device will respond to either of the two reset
commands; Reset CU or Reset FCB (Communication Unit or Frame Count Bit). The difference between the
two commands is that the Reset CU command will clear any unsent messages in the transmit buffer,
whereas the Reset FCB command does not delete any messages.
The device will respond to the reset command with an identification message ASDU 5. The Cause of
Transmission (COT) of this response will be either Reset CU or Reset FCB depending on the nature of the
reset command. The content of ASDU 5 is described in the IEC
60870-5-103 section of the Menu Database,
available from Alstom Grid separately if required.
In addition to the above identification message, it will also produce a power up event.
Chapter 7 - SCADA Communications MiCOM P747
204 P747-TM-EN-1
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