ModBus Mode Communications
Append
ix
B
B–24
No response occurs:
In the cases below, the inverter ignores a query and returns no response.
• When receiving a broadcasting query
• When detecting a transmission error in reception of a query
• When the slave address set in the query is not equal to the slave address of the inverter
• When a time interval between data elements constituting a message is shorter than
3.5 characters
• When the data length of the query is invalid
NOTE:
Provide a timer in the master and make the master retransmit the same query when no
response is made within a preset time period after the preceding query was sent.
2 2 h
The specified functions are not available to the inverter.
•
Function to change the content of a register that cannot be changed
while the inverter is in service
•
Function to submit an ENTER command during running (UV)
•
Function to write in a register during tripping (UV)
•
Function to write in a read-only register (or coil)
Exception Code
Description