9-19
9-4-9 Communication Error Code
The inverter detects the following errors. The error code is in hexadecimal notation.
Table 9-4-4 Communication error code
Error code
(hexadecimal)
Name of error Description
47H Checksum error
The checksum of the frame sent to the own station
is in discrepancy.
48H Parity error The parity is in discrepancy.
49H Others
Reception error other than above (framing,
overrun)
4AH Format error
The enquiry character or the end-of-text character
in the transmitted frame is in an incorrect position.
4BH Command error
A code other than designated commands
(standard and option) is sent.
4EH Function code error A request for an unknown function code is issued.
4FH Write disable
A write prohibited function or in-operation write
prohibited function is written during operation.
50H Data error Data exceeding the standard range is written.
The inverter does not return NAK in response to errors 47 through 49 above. It issues no response.
In the case of errors 4A through 50, an NAK response with an NAK code in the response character
field and the two digit hexadecimal error code in the data field is returned.
The latest error can be referred to using the transmission error end code monitor (M26).
9-4-10 Data Type
(1) In the case of value data
16 bit data is expressed in a hexadecimal and set using four ASCII codes. Concretely speaking, the
data is between "0000" and "FFFF".
Decimal fractions are weighted into integers. Refer to the corresponding section because the weight
varies according to each piece of function data. In some functions, the negative value is expressed in
two's complement.
The bit data is converted into the hexadecimal and expressed.
The acknowledgement sent from the inverter in response to a selecting (writing) request is the writing
data. In the negative acknowledgement, the error code is returned in two hexadecimal characters.
Set "0000" or an arbitrary letters and numbers in the data to be transmitted to the inverter in a polling
(reading) frame.
Example: Frequency data, weight 100 times
120.00Hz 120×100=12000=2EE0H
The data is "2" in ASCII, "E" in ASCII, "E" in ASCII and "0" in ASCII in order from the first character
to the fourth character.
Acceleration time data, weight 10 times
6.5 sec: 6.5 x 10 = 65 = 41H
The data is "0" in ASCII, "0" in ASCII, "4" in ASCII and "1" in ASCII in order from the first character to
the fourth character.
(2) In the case of bit data
For bit type data requested by S06, M13 or other functions, the bit data is expressed in hexadecimal
notation and each digit is transmitted in ASCII codes.
Example: S06 with FWD (bit 0) ON, X1 (bit 2) ON, and X3 (bit 4) ON
Bit data = 0000 0000 0001 0101 → 0015H → 30H 30H 31H 35H
(Hexadecimal) (ASCII)
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