8
469 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE
MODBUS FUNCTIONS
COMMUNICATIONS GUIDE
Execute Operation
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
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).
Store Single Setpoint
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.
Slave Response
Bytes
Example
Description
Slave Address
1
0B
message from slave 11
Function Code
1
03
read register values
Byte Count
1
04
2 registers = 4 bytes total
Data #1 (high, low)
2
00 64
value in address 0308h
Data #2 (high, low)
2
00 0A
value in address 0309h
CRC (low, high)
2
EB 91
computed CRC error code
Master Transmission
Bytes
Example
Description
Slave Address
1
0B
message for slave 11
Function Code
1
05
execute operation
Operation Code
2
00 01
remote reset command
Code Value
2
FF 00
perform operation
CRC (low, high)
2
DD 50
computed CRC error code
Slave Response
Bytes
Example
Description
Slave Address
1
0B
message from slave 11
Function Code
1
05
execute operation
Operation Code
2
00 01
remote reset command
Code Value
2
FF 00
operation performed
CRC (low, high)
2
DD 50
computed CRC error code
