Execute Operation; Store Single Setpoint - GE 469 Communications Manual

MODBUS FUNCTIONS

Execute Operation

Store Single Setpoint

8
Slave Response
Slave Address
Function Code
Byte Count
Data #1 (high, low)
Data #2 (high, low)
CRC (low, high)
Modbus Implementation: Force Single Coil
469 Implementation: Execute Operation
This function code allows the master to request an 469 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 Store Multiple Setpoints on page TOC–10 for complete details.
Supported Operations: Reset 469 (operation code 1), Motor Start (operation code 2), Motor
Stop (operation code 3), Waveform Trigger (operation code 4).
MESSAGE FORMAT AND EXAMPLE:
Reset 469 (operation code 1).
Master Transmission
Slave Address
Function Code
Operation Code
Code Value
CRC (low, high)
Slave Response
Slave Address
Function Code
Operation Code
Code Value
CRC (low, high)
Modbus Implementation: Preset Single Register
469 Implementation: Store Single Setpoint
This command allows the master to store a single setpoint into the memory of an 469. 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, setpoints address 1180 will contain the value 01F4.
Bytes Example
1 0B message from slave 11
1 03 read register values
1 04 2 registers = 4 bytes total
2 00 64 value in address 0308h
2 00 0A value in address 0309h
2 EB 91 computed CRC error code
Bytes Example
1 0B message for slave 11
1 05 execute operation
2 00 01 remote reset command
2 FF 00 perform operation
2 DD 50 computed CRC error code
Bytes Example
1 0B message from slave 11
1 05 execute operation
2 00 01 remote reset command
2 FF 00 operation performed
2 DD 50 computed CRC error code
469 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE
COMMUNICATIONS GUIDE
Description
Description
Description