8 Communications Functions
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
8-5-9 Exception Response
In a query, the master requests a response, except for broadcast or simultaneous broadcast by group.
Although the inverter normally returns a response to the query, it returns an exception response if the
query has an error.
An exception response has the field configuration shown in the table below.
Slave address
Function code
Exception code
Error check
The details of the field configuration are as shown below. An exception response has a function code,
which is the sum of the function code value of the query and 80 hex. An exception code shows the fac-
tor of the exception response.
An unsupported function is specified.
The specified address does not exist.
The specified data is in an unacceptable format.
The Write to Holding Register function is specified, but the data is out of
the setting range.
The inverter does not allow this function because:
• Function attempts to change a register that cannot be changed during
RUN.
• Function attempts to issue the Enter command during RUN (UV
*1
).
• Function attempts to write data to a register during trip (UV
*1
).
• Function attempts to write data to a register on which the soft lock func-
tion is enabled.
• Function attempts to change an I/O terminal that cannot be changed.
• Function attempts to change the contact type of the terminal to which
the RS (Reset) is allocated.
• Function attempts to write data to a register when the auto-tuning func-
tion is enabled.
• Function attempts to write data to a password-locked register when the
password function is enabled.
Function attempts to write data to a read-only register (coil).
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