CHAPTER 7: MODBUS COMMUNICATIONS
MODBUS FUNCTIONS
PQM POWER QUALITY METER – INSTRUCTION MANUAL
7–7
7.2.3
Function Code
05 - Execute
Operation
Modbus Implementation:
Force Single Coil
PQM Implementation:
Execute Operation
This function code allows the master to request a PQM to perform specific command
operations. The command numbers listed in the Commands area of the memory map
correspond to operation codes 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 FUNCTION 16 - PERFORMING COMMANDS
section for complete details.
MESSAGE FORMAT AND EXAMPLE:
Reset PQM (operation code 1).
Table 7–2: Master/Slave Packet Format for Function Code 05H
MASTER
TRANSMISSION
BYTES
EXAMPLE
DESCRIPTION
SLAVE ADDRESS
1
11
message for slave 17
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
DF 6A
CRC error code
SLAVE RESPONSE
BYTES
EXAMPLE
DESCRIPTION
SLAVE ADDRESS
1
11
message from slave 17
FUNCTION CODE
1
05
execute operation
OPERATION CODE
2
00 01
operation code 1
CODE VALUE
2
FF 00
perform function
CRC
2
DF 6A
CRC error code
Содержание Multilin PQM
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