User manual

Appendix 4 MODBUS Communication
Function
code
Paramete
r name
Chan
ge
MODBUS
address
Setting range Default
Pb.06
Selection
of
MODBU
S data
storage
0: Not save to EEPROM
1:Directly save to
EEPROM
0 ×
Pb.07
CCF6
Fault
Handling
0:Not generate fault and
keep on running
1:Generate fault and stop
0 ×
* NOTE 1: Only select communication function of parameters: P0.01, P0.02, P0.04,
P7.00, P7.01, can MODBUS （0001H-0004H）write-in message be accept by the
inverter Or the inverter will response an error “02H”.
* NOTE 2: If MODBUS Baud Rate and MODBUS Parity have been changed, the new
parameters will not be effective until the invert power off and restart.
The master and the slave must keep the same communication parameters setting.
Otherwise, it is hard to make communication between them, or communication error.
* NOTE 3: When the MODBUS Station Address of inverter is zero, the inverter will not
accept the message that the master sends, even if the broadcast instruction. When the
address has been changed, it will take effect at once.
* NOTE 4: To be compatible with the inverter of other series, Please select the unit of
frequency reference carefully. If we set Pb.05= 1, the send value 01F4H will be equal to
50.00 Hz as frequency reference. However, if we set Pb.05=0, the send value 01F4H will
be equal to 5.00 Hz as frequency reference. If we want to set frequency reference as
50.00 Hz, the message value must be 1388H.
Transmission period limiting
In order to cut down the packet loss rate caused by communication interference and to
reach the optimum communication effect, please limit the transmission periods
according to your need in the master station, thus ensuring the normal process of data
transmitting and receiving.
Minimum
transmission period
Recommended transmission
period
Pb.00 MODBUS
Baud rate selection
（Even parity
checking only）
(no checking methods limiting)
0:1200 220ms 250ms
1:2400 110ms 150ms
2:4800 65ms 100ms
90ms
3:9600 50ms
80ms
4:19200 35ms
5:38400 17ms
50ms
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