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4.3
Communications Errors
4.3.1
Categories of communications errors
The communications-related errors the inverter detects are listed below:
Error
category
Transmission
error
Checksum error
Parity error
Other errors
Logical error
Format error
Command error
Link priority error
Function code
error
Write disabled
error
Data error
Error during
writing
Communications
Communications
link break error
link break error
Table 4.14 Communications errors detected by inverter
Error name
The frame to the local station is
found unmatched in checksum
collation.
The parity is unmatched.
Receiving errors other than the
abovementioned (framing error,
overrun error)
- The characters of the transmission
request are incorrect.
- The last character of the message
is not in the specified position.
A command that does not exist
was transmitted.
A frequency command, PID
command, or change command of
the run command (writing request
to S01, S05, S06, and S13) are
sent through the communications
route other than that specified with
H30.
A function code that does not exist
was requested.
An attempt was made during
operation to write the function code
for write disabled or for write
disabled during operation.
The write data is beyond the
writable range.
An attempt was made to write
another function data during
function writing with command A.
The inverter did not receive a
normal frame addressed to local
station or to other stations within the
communications link break detection
time specified with the function
code.
4-17
4.3 Communications Errors
Error code
Description
74 (4A
75 (4B
76 (4C
78 (4E
79 (4F
Order of
(M26)
priority
−
71 (47
)
H
−
72 (48
)
H
−
73 (49
)
H
)
1
H
)
2
H
)
3
H
)
4
H
)
5
H
80 (50
)
6
H
81 (51
)
7
H
−
−
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