Micom P721, Техническое руководство

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Communication database P72x/EN CT/A11
MiCOM P721/P723 Page 51/78
5. IEC60870-5-103 INTERFACE
The IEC60870-5-103 interface is a master/slave interface with the relay as the slave device.
This protocol is based on the VDEW communication protocol. The relay conforms to
compatibility level 2, compatibility level 3 is not supported.
The following IEC60870-5-103 facilities are supported by this interface:
•
Initialisation (Reset)
•
Time Synchronisation
•
Event Record Extraction
•
Disturbance Record Extraction
•
General Interrogation
•
Cyclic Measurements
•
General Commands
5.1 Physical connection and link layer
Connection is available for IEC60870-5-103 through the rear RS485 port. It is possible to
select both the relay address and baud rate using the front panel interface. Following a
change, a reset command is required to re-establish communications.
The parameters of the communication are the following:
•
Even Parity,
•
8 Data bits,
•
1 stop bit,
•
Communication speed can be set in the front panel of the relay:
Baud rate (dec)
300
600
1200
2400
4800
9600
19200
38400
•
Isolated two-point RS485 connection (2kV 50Hz),
•
Asynchronous transmission.
To connect the relay after a parameter, speed, parity or address modification, a reset
command is required.
5.2 Link layer
IEC870-5-103 frame conforms with IEC 870-5-FT1.2 standards. In addition, Special
commands are added in accordance with IEC870-5-103 standard.