GE Multilin G650 Manual page 436

APPENDIX B
to read all Snapshot events.
"EVE.BIN":
"NEW_EVE.BIN": to read new events since the last reading of this file.
to read events starting by number 234.
"EVE0234.BIN":
The second and successive messages are read in address 0xff00 in blocks of 250 bytes (4 bytes that indicate the point
value to the file, 2 bytes that indicate the number of data sent, and 244 data bytes). If during this process there is an error
response, the request can be repeated in address 0xff02 reading 246 bytes (2 bytes that indicate the number of bytes sent,
and 244 data bytes).
Each Snapshot event includes:
1º byte: event format code.
N bytes: Event information structured depending on the code
At this moment there is only one format type with code 0. Its structure is as follows:
• -UINT16: event handle.
• -8 bytes: event date and time.
• -29 bytes: event cause. (string finished in null).
• -UINT32: Phasor Ia (scaled to 1000).
• -UINT32: Phasor Ib (scaled to 1000).
• -UINT32: Phasor Ic (scaled to 1000).
• -UINT32: Line Frequency (scaled to 1000).
• -UINT32: Phasor Ig (scaled to 1000).
• -UINT32: Phasor Isg (scaled to 1000).
• -UINT32: Zero seq I0 (scaled to 1000).
• -UINT32: Positive seq I1 (scaled to 1000).
• -UINT32: Negative seq I2 (scaled to 1000).
• -UINT32: Phasor Van (scaled to 1000).
• -UINT32: Phasor Vbn (scaled to 1000).
• -UINT32: Phasor Vcn (scaled to 1000).
• -UINT32: Positive Seq V1 (scaled to 1000).
• -UINT32: Negative Seq V2 (scaled to 1000).
• -UINT32: Zero Seq V0 (scaled to 1000).
• -UINT32: 3 Phase Power Factor (scaled to 1000).
Example:
st
1 step:
[0xFE 0x10 0xFE 0x00 0x00 0x06 0x0C 0x4E 0x45 0x57 0x5F 0x45 0x56 0x45 0x2E 0x54 0x58 0x54 0x00 0x16 0xB0] ---
-----> RELAY
PC <--------- [0xFE 0x10 0xFE 0x00 0x00 0x06 0x65 0xEC]
nd
2 step:
[0xFE 0x03 0xFF 0x00 0x00 0x7D 0xA1 0xF0] --------> RELAY
Probably the relay will respond with "SLAVE DEVICE BUSY":
PC <--------- 0xFE 0x83 0x06 0xF1 0x02]
The request is repeated:
[0xFE 0x03 0xFF 0x00 0x00 0x7D 0xA1 0xF0] --------> RELAY
GEK-113285A G650 Generator Protection & Control System
B.4 MODBUS APPENDIX
B-9
B