Technical Guide P92x/EN CT/E11
Modbus Protocol
MiCOM P921-P922-P923 Page 65/118
1.10 Specific formats for the frequency disturbance records files (P923 only)
CODE DESCRIPTION
F70 Stauts Frame of the frequency disturbance record
1st Word: Flag of Presence of the frequency disturbance (0: absent , 1: present , 2
under
recording).
2nd Word: date of the oldest record (sec , MSB)
3rd Word: date of the oldest record (sec, LSB)
4th Word: date of the oldest record (msec , MSB)
5th Word: date of the oldest record (msec, LSB)
6th Word: Cause of frequency disturbance trigger :
Control Commande order for Starting frequency disturbance record
Specific logic input: Start disturbance record
Instantaneous rate of change of frequency element or a time delayed
frequency threshold.
Time delayed information of a logic equation
Closing of the tripping contact (RL1)
7th Word: Acknowledgement
F71 Frequency disturbance record data
1st Word: Samples number contained in the mapping
2nd Word: Pre-time sample number
3rd Word: Post-time sample number
4th Word: Primary value of the phase VT (LSB)
5th Word: Primary value of the phase VT (MSB)
6th Word: Secondary value of the phase VT
7th Word: Primary value of the residual VT (LSB)
8th Word: Primary value of the residual VT (MSB)
9th Word: Secondary value of the residual VT
10th Word: Internal ratio- numerator (100)
11th Word: Internal ratio- denominateur (6300 or 1700 )
12th Word: Address of the last page in the mapping (containning samples)
13th Word: Words number contained in the last page of the mapping
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