GE D90 Plus - Page 3

D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – COMMUNICATIONS GUIDE iii
D90
Plus
Line Distance Protection System
Table of contents
1 INTRODUCTION Safety symbols and definitions....................................................................................1
For further assistance ...................................................................................................1
2MODBUS
COMMUNICATION
Modbus protocol overview ...........................................................................................3
Physical layer....................................................................................................................................................3
Data link layer ..................................................................................................................................................4
CRC-16 algorithm...........................................................................................................................................4
Modbus function codes .................................................................................................5
Read actual values ........................................................................................................................................5
Execute command.........................................................................................................................................6
Exception responses.....................................................................................................................................7
Modbus settings .............................................................................................................8
Modbus protocol.............................................................................................................................................8
Modbus user map ..........................................................................................................................................8
Modbus memory map....................................................................................................9
Modbus data formats............................................................................................................................. 156
3DNP
COMMUNICATION
DNP device profile ..................................................................................................... 197
DNP v3.00 device profile document ................................................................................................ 197
DNP v3.00 implementation document........................................................................................... 199
DNP protocol settings............................................................................................................................. 208
DNP points .................................................................................................................. 212
Binary input points................................................................................................................................... 212
Binary and control relay output points ..........................................................................................212
Binary and frozen counter points ..................................................................................................... 213
Analog input points ................................................................................................................................. 214
DNP user point list settings.................................................................................................................. 214
INDEX