P92x/EN CT/E11 Technical Guide
IEC 60870-5-103
Page 116/118 MiCOM P921-P922-P923
6. PROCESSED COMMANDS
6.1 System Commands
- Synchronization Command (ASDU 6) : INF <0>, TYP <6>, COT<9>
This command can be sent to a specific relay, or global, it only exists on the P922
and P923. The time sent by master is the time of the first bit of the frame. The relay
synchronizes with this time, corrected by the frame transmission delay. After updating
its time, the relay send back an acknowledge to the master, by giving its new current
time. This acknowledge message will be an event of ASDU 6 type.
- General Interrogation Initialization command (ASDU 7) :
INF <0>, TYP <7>, COT<9>
This command starts the relay interrogation :
The relay then sends a list of data containing the relay state (see list described above).
The GI command contains a scan number which will be included in the answers of
the GI cycle generated by the GI command.
If a data has just changed before extracted by the GI, the new state is sent to the
master station.
When an event is generated during the GI cycle, the event is sent in priority, and the
GI cycle is temporarily interrupted. The end of the GI consists in sending an ASDU 8
to the master station.
If, during a General Interrogation cycle, another GI Initialization command is
received, the precedent answer is stopped, and the new GI cycle started.
6.2 General Commands (ASDU 20) (Control direction)
Leds Reset : This command acknowledge all alarms on Front Panel on MiCOM
P92x products : INF<19>, TYP<20>, COT <20>
· Setting group number 1 : INF<23>, TYP<20>, COT <20>
· Setting group number 2 : INF<24>, TYP<20>, COT <20>
· Trip TC : INF <142>; TYP <20>; COT<20>
· Close TC : INF <143>; TYP <20>; COT<20>
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.
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