Appendix B PE6000 User Manual
198
The communication protocol of PE6000 series AC drive is Modbus-RTU slave communication
protocol, which can respond the “Check/Command” of main station or make related action
according to “Check/Command” of main station and answer the communication data.
The main station includes PC, Industrial control device, PLC, etc. When main station send
“Check/Command” to a single slave station, it has to resend a answer frame; when main station
send broadcast information, slave stations have no need to respond.
J.2 Communication Information Structure
The format of Modbus protocol communication data of PE6000 series AC drive is as below: AC
drive only support the read and write of Word parameter, and the “read” operation command is
0×03
;
“write” operation command is 0 ×06; the read and write operation of byte and bit is not
supported.
In theory, host computer can read dozens of function codes continuously
(
n max=12
)
, but it
cannot stride the last function code of this function code group, or the answer might have error.
Slave station “read”
answer frame
Idle (FH)
Target station
address
Function code
parameter H-L
Read
command
0×03
CRC verify
sum H-L
Idle
>3.5Byte
1Byte
1Byte
1Byte
(2n)Byte
2Byte
CRC verify
Data byte
amount (2n)
Main station “read”
command frame
Idle (FH)
Target station
address
Function code
address H-L
Read
command
0×03
Function code
amount (n)
CRC verify
sum H-L
Idle
>3.5Byte
1Byte
1Byte
2Byte
1Byte
2Byte
CRC verify
Main station sends 1
Slave station
answers 1
Main station sends 2 Slave station answers 2
>3.5
transmission
time
Data frame
>3.5
transmission
time
Data frame