Ge 489 User Manual download pdf (Page 166)

6-4 489 Generator Management Relay GE Multilin

6.2 MODBUS FUNCTIONS 6 COMMUNICATIONS

6.2.3 FUNCTION CODE 05: EXECUTE OPERATION

Modbus Implementation: Force Single Coil

489 Implementation: Execute Operation

This function code allows the master to request specific 489 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 6.2.7 Function

Code 16: Store Multiple Setpoints on page 6–6 for complete details.

Supported Operations: Reset 489 (operation code 1); Generator Start (operation code 2);

Generator Stop (operation code 3); Waveform Trigger (operation code 4)

MESSAGE FORMAT AND EXAMPLE

Reset 489 (operation code 1).

6.2.4 FUNCTION CODE 06: STORE SINGLE SETPOINT

Modbus Implementation: Preset Single Register

489 Implementation: Store Single Setpoint

This command allows the master to store a single setpoint into the 489 memory. The slave response to this function code is

to echo the entire master transmission.

MESSAGE FORMAT AND EXAMPLE

Request slave 11 to store the value 01F4 in Setpoint address 1180. After the transmission in this example is complete, Set-

points address 1180 will contain the value 01F4.

MASTER TRANSMISSION: BYTES EXAMPLE (HEX):

SLAVE ADDRESS 1 0B message for slave 11

FUNCTION CODE 1 05 execute operation

OPERATION CODE 2 00 01 reset command (operation code 1)

CODE VALUE 2 FF 00 perform function

CRC 2 DD 50 CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE (HEX):

SLAVE ADDRESS 1 0B response message from slave 11

FUNCTION CODE 1 05 execute operation

OPERATION CODE 2 00 01 reset command (operation code 1)

CODE VALUE 2 FF 00 perform function

CRC 2 DD 50 CRC calculated by the slave

MASTER TRANSMISSION: BYTES EXAMPLE (HEX):

SLAVE ADDRESS 1 0B message for slave 11

FUNCTION CODE 1 06 store single setpoint

DATA STARTING ADDRESS 2 11 80 setpoint address 1180

DATA 2 01 F4 data for address 1180

CRC 2 8D A3 CRC calculated by the master

SLAVE RESPONSE: EXAMPLE (HEX):

SLAVE ADDRESS 1 0B message for slave 11

FUNCTION CODE 1 06 store single setpoint

DATA STARTING ADDRESS 2 11 80 setpoint address 1180

DATA 2 01 F4 data for address 1180

CRC 2 8D A3 CRC calculated by the slave

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 258 259

Comments to this Manuals

No comments

Ge 489 User Manual Page 166

Comments to this Manuals

Related products and manuals for Generators Ge 489