Areva MiCOM P225, Technical Manual

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P225/EN CT/B11 Communication
Page 8/52 MiCOM P225
1.4.4 Request to retrieve an index frame
Slave number Function code Word address Word number CRC
xx 03h 22h 00 00 07h xx............xx
This event request may be answered an error message with the error code :
CODE_SERV_NOK (05) : The record number and the channel number have
not been specified by a service request.
1.5 Modbus request definition used to retrieve the event records
Two ways can be followed to retrieve an event record :
−
Send a request to retrieve the oldest non-acknowledge event.
−
Send a request to retrieve a dedicated event.
1.5.1 Request to retrieve the oldest non-acknowledge event
Slave number Function code Word address Word number CRC
xx 03h 36h 00 00 09h xx............xx
This event request may be answered an error message with the error code :
EVT_EN_COURS_ECRIT (5) : An event is being written into the saved RAM.
NOTA : On event retrieval, two possibilities exist regarding the event record
acknowledgement :
- a) Automatic event record acknowledgement on event retrieval.
- b) Non automatic event record acknowledgement on event retrieval.
a) Automatic event record acknowledgement on event retrieval :
The bit12 of the remote order frame (format F9 – mapping address 0400h) shall be set to 0.
On event retrieval, this event record is acknowledged.
b) Non automatic event record acknowledgement on event retrieval :
The bit12 of the remote order frame (format F9 – mapping address 0400h) shall be set to 1.
On event retrieval, this event record is not acknowledged.
To acknowledge this event, an other remote order shall be sent to the relay. The bit 13 of
this frame (format F9 – mapping address 0400h) shall be set to 1.
1.5.2 Request to retrieve a dedicated event
Slave number Function code Word address Word number CRC
xx 03h Refer to mapping 00 09h xx............xx
This event request may be answered an error message with the error code :
EVT_EN_COURS_ECRIT (5) : An event is being written into the saved RAM.
NOTA : This event retrieval does not acknowledge this event.