AEG 239 D User Manual download pdf (Page 11)

COMMUNICATIONS GUIDE

239 MOTOR PROTECTION RELAY – COMMUNICATIONS GUIDE CG–7

FUNCTION CODE - 1 byte 03 read registers

BYTE COUNT - 1 byte 06 3 registers = 6 bytes

DATA 1 - 2 byte 00 00 bit set corresponding to

command 13

DATA 2 - 2 bytes 00 00 value in address 006C

DATA 3 - 2 bytes 00 00 value in address 006D

CRC - 2 bytes EC B5 CRC calculated by slave

CG.3.2 05: Execute Operation

• Modbus Implementation: Force Single Coil

• 239 Implementation: Execute Operation

This function code allows the master to request a 239 to perform specific command

operations. The command numbers listed in the Commands area of the memory map

correspond to operation code for function code 05.

The operation commands can also be initiated by writing to the Commands area of

the memory map using function code 16. Refer to Section CG.4: 16: Performing

Commands on page –12 for complete details.

MESSAGE FORMAT AND EXAMPLE

Reset 239 (operation code 1).

Master Transmission Bytes Example (hex)

SLAVE ADDRESS - 1 byte 11 message for slave 11

FUNCTION CODE - 1 byte 05 execute operation

OPERATION CODE - 2 bytes 00 01 reset command

(operation code 1)

CODE VALUE - 2 bytes FF 00 perform function

CRC - 2 bytes DF 6A CRC calculated by the

master

Slave Response Bytes Example (hex)

SLAVE ADDRESS - 1 byte 11 message from slave 11

FUNCTION CODE - 1 byte 05 execute operation

OPERATION CODE - 2 bytes 00 01 reset command

(operation code 1)

CODE VALUE - 2 bytes FF 00 perform function

CRC - 2 bytes DF 6A CRC calculated by slave

CG.3.3 06: Store Single Setpoint

• Modbus Implementation: Preset Single Register

• 239 Implementation: Store Single Setpoint

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 57 58

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AEG 239 D User Manual Page 11