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The relay conforms to compatibility level 2; compatibility level 3 is not supported.
The following IEC60870-5-103 facilities are supported by this interface: initialization (reset), time
synchronization, event record extraction, general interrogation, cyclic measurements, general
commands and disturbance records.
10.3.1 Physical Connection and Link Layer
The EIA RS-485 standardized ports are available for IEC60870-5-103 in this relay. The baudrate is
optional: 4800bps, 9600bps, 19200bps, 38400bps, 57600bps or 115200bps.
The unattached Ethernet ports are available for IEC60870-5-103 in this relay. The transmission
speed is 100Mbit/s.
The link layer strictly abides by the rules defined in the IEC60870-5-103.
10.3.2 Initialization
Whenever the relay has been powered up, or if the communication parameters have been
changed, a reset command is required to initialize the communications. The relay will respond to
either of the two reset commands (Reset CU or Reset FCB), the difference is that the Reset CU
will clear any unsent messages in the relay's transmit buffer.
The relay will respond to the reset command with an identification message ASDU 5, the COT
(Cause Of Transmission) of this response will be either Reset CU or Reset FCB depending on the
nature of the reset command.
In addition to the above identification message, if the relay has be en powered up it will also
produce a power up event.
10.3.3 Time Synchronization
The time and date of this relay can be set by using the time synchronization feature of the
IEC60870-5-103 protocol. The relay will correct for the transmission delay as specified in
IEC60870-5-103. If the time synchronization message is sent as a send/confirm message , then
the relay will respond with a confirmation. Whether the time synchronization message is sent as a
send confirmation or a broadcast (send without any reply) message, a time synchronization Class
1 event will be generated.
If the clock is synchronized using the IRIG-B input then it will not be possible to set clock by using
the IEC60870-5-103 interface. An attempt to set the time via the interface will cause th is relay to
create an event with the current date and time taken from the IRIG-B synchronized internal clock.
10.3.4 Spontaneous Events
The spontaneous events are categorized using the following information: type identification (TYP),
function type (FUN) and information number (INF). This relay can support ASDU 1, ASDU 2,
ASDU 40 and ASDU 41, the cause of transmission (COT) is "1".
ASDU 1, time-tagged message: alarm messages, special purpose binary input state change
messages.
PCS-9611 Feeder Relay
Date: 2014-04-08
10 Communication
10-5
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