Areva MiCOM P225, Technical Manual

Page: 190 / 288

P225/EN CT/B11 Communication
Page 10/52 MiCOM P225
1.7 Modbus request definition used to retrieve both start-up current & voltage form record
To retrieve both start-up current & voltage form record, process as described below :
1. Send a request to know the number of values stored into the saved RAM.
2. Send a request to retrieve the start-up record data relevant to current or voltage signal
form.
1.7.1 Request to know the number of current values stored into the saved memory
Slave number Function code Word address Word number CRC
xx 03h 34H 00 00 03h xx............xx
1.7.2 Request to retrieve the start-up current form record data
Slave number Function code Word address Word number CRC
xx 03h Refer to mapping 004 to 7Ch xx............xx
NOTA : The number of requested words shall be a 2 multiple number as the
value of a start-up current form record sample is coded on 4 bytes.
One page of the mapping can stored up to 248 words.
1.7.3 Request to know the number of voltage values stored into the saved memory
Slave number Function code Word address Word number CRC
xx 03h 51h 00 00 03h xx............xx
1.7.4 Request to retrieve the start-up voltage form record data
Slave number Function code Word address Word number CRC
xx 03h Refer to mapping 04 to 7Ch xx............xx
NOTA : The number of requested words shall be a 2 multiple number as the
value of a start-up voltage form record sample is coded on 4 bytes.
One page of the mapping can stored up to 248 words.