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P72x/EN CT/A11
Communication database
Page 60/78
MiCOM P721/P723
General Commands (ASDU
20) (Control Direction)
Availability
Trip TC:
FUN<210>;INF <1>; TYP <20>;
COT<20>,<ADDR>
Disturbance trig:
FUN<210>;INF <3>; TYP <20>;
COT<20>,<ADDR>
Maintenance mode trig:
FUN<210>;INF <7>; TYP <20>;
COT<20>,<ADDR>
After executing one of these commands, the relay sends an acknowledge message, which
contains the result of command execution.
If a state change is the consequence of the command, it must be sent in a ASDU 1 with COT
12 (remote operation).
If the relay receive another command message from the master station before sending the
acknowledge message, it will be discarded.
Commands which are not processed by the relay are rejected with a negative acknowledge
message.
6.4
Relay re initialization
In case of relay re initialization, the relay send to the master station:
Availability
A message indicating relay
start/restart:
(FUN<208>;INF <5>; TYP <5> COT <5>)
or a message indicating Reset
CU:
(FUN<208>;INF <5>; TYP <3> COT <4>)
or a message indicating Reset
FCB :
(FUN<208>;INF <5>; TYP <2> COT <3>)
Each identification message of the relay (ASDU 5) contains the manufacturer name in 8
ASCII characters and 2 free bytes containing: « 721 » or « 723 »,in decimal format, then 2
free bytes containing the software version number in decimal (for ex. : 112 corresponds to
“11.C”).
6.5
Cyclic Messages (Class 2 – measurements)
Only measurands can be stored in these messages.
The measurands values are stored in lower levels of communication, before polling by
master station.
Measurands I1,I2,I3,V1,V2,V3, P, Q
FUN<208>;INF <148>; TYP <9>;
COT<2>,<ADDR>
Several of the fields in the ASDU 9 are not used (Voltage and Power values), so they are set
to 0: Only RMS Ia, Ib, Ic values and frequency are stored (with a rate such as: 2,4 * nominal
value = 4096).
Measurands In, Ven
FUN<208>;INF <147>; TYP <3>;
COT<2>,<ADDR>
The second ASDU is ASDU3.4 (STRUCT<2>), which contains in first position In earth
current value in rated format (with a rate such as: 2,4 * nominal value = 4096). Ven value
does not exist, so the second position value in ASDU3.4 is set to « unused ».
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