7.3 TIME SYNCHRONISATION
The time and date can be set using the time synchronization feature of the IEC 60870-5-103 protocol. The
device will correct for the transmission delay as specified in IEC
60870-5-103. If the time synchronization
message is sent as a send/confirm message then the device will respond with a confirm message. A time
synchronization Class 1 event will be generated/produced whether the time-synchronization message is sent
as a send confirm or a broadcast (send/no reply) message.
If the clock is being synchronized using the IRIG-B input then it will not be possible to set the device time
using the IEC 60870-5-103 interface. An attempt to set the time via the interface will cause the device to
create an event with the current date and time taken from the IRIG-B synchronized internal clock.
7.4 SPONTANEOUS EVENTS
Events are categorized using the following information:
● Function type
● Information Number
The IEC 60870-5-103 profile in the Menu Database contains a complete listing of all events produced by the
device.
7.5 GENERAL INTERROGATION (GI)
The GI request can be used to read the status of the device, the function numbers, and information numbers
that will be returned during the GI cycle. These are shown in the IEC
60870-5-103 profile in the Menu
Database.
7.6 CYCLIC MEASUREMENTS
The device will produce measured values using ASDU 9 on a cyclical basis, this can be read from the device
using a Class 2 poll (note ADSU 3 is not used). The rate at which the device produces new measured values
can be controlled using the measurement period setting. This setting can be edited from the front panel
menu or using MiCOM S1 Agile. It is active immediately following a change.
The device transmits its measurands at 2.4 times the rated value of the analogue value.
7.7 COMMANDS
A list of the supported commands is contained in the Menu Database. The device will respond to other
commands with an ASDU 1, with a cause of transmission (COT) indicating ‘negative acknowledgement’.
7.8 TEST MODE
It is possible to disable the device output contacts to allow secondary injection testing to be performed using
either the front panel menu or the front serial port. The IEC
60870-5-103 standard interprets this as ‘test
mode’. An event will be produced to indicate both entry to and exit from test mode. Spontaneous events and
cyclic measured data transmitted whilst the device is in test mode will have a COT of ‘test mode’.
7.9 DISTURBANCE RECORDS
The disturbance records are stored in uncompressed format and can be extracted using the standard
mechanisms described in IEC 60870-5-103.
Note:
IEC 60870-5-103 only supports up to 8 records.
MiCOM P747 Chapter 7 - SCADA Communications
P747-TM-EN-1 205
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