P92x/EN CT/E11 Technical Guide
Modbus Protocol
Page 12/118 MiCOM P921-P922-P923
1.6.1 Request to retrieve the oldest non-acknowledge fault record
Slave number Function code Word address Word number CRC
xx 03h 3Eh 00 00 0Fh xx........xx
NOTA : On fault retrieval, two possibilities exist regarding the fault
record acknowledgement:
a) Automatic fault record acknowledgement on event retrieval.
b) Non automatic fault record acknowledgement on event
retrieval.
a) Automatic fault record acknowledgement on fault retrieval :
The bit12 of the remote order frame (format F9 - mapping address 0400h) shall be
set to 0. On fault retrieval, this fault record is acknowledged.
b) Non automatic fault record acknowledgement on fault retrieval :
The bit12 of the remote order frame (format F9 - mapping address 0400h) shall be
set to 1. On fault retrieval, this fault record is not acknowledged.
To acknowledge this fault, an other remote order shall be sent to the relay. The bit 14
of this frame (format F9 – mapping address 0400h) shall be set to 1.
1.6.2 Request to retrieve a dedicated fault record
Slave number Function code Word address Word number CRC
xx 03h Refer to mapping 00 0Fh xx........xx
NOTA : This fault value retrieval does not acknowledge this fault record.
To Next Page
Loading...
