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CFW-08 OPTIONS AND ACCESSORIES
In the example the Object Value has not been represented as hexadecimal
value, but with corresponding ASCII characters.
For instance, for the object 00, the ´WEG‘ value has been transmitted as
being three ASCII characters, that as hexadecimal have the values 57h
(W), 45h (E) e 47h (G).
8.20.4 Communication Errors
Errors can occur during the message transmission on network, or in the
content of the received messages. Depending on the error type, inverter
may answer or not to the master:
When the master sends a message to an inverter configured at determined
network address, the inverter will not response if:
Error in the parity bit.
Error the CRC.
Time out between transmitted bytes (3.5 times the time required for
the transmission of a 11-bit word).
In the case of a successful reception of the message, the inverter can
detect problems and send a error message to the master indicating the
problem that has been verified:
Invalid function (error code = 1): the requested function has not been
implemented for the inverter.
Invalid data address (error code = 2): the data address (register or bit)
does not exist.
Data value invalid (error code = 3): this error occurs in the following
conditions:
Value is out of permitted range.
Writing in data that cannot be changed (only read register, or
register that does not allow changing with enabled inverter or bits
of logic status).
Writing in function of the logic command that has not been enabled
via serial interface.
8.20.4.1 Error Messages
When any error occurs in the message content (not during the data
transfer), the slave must return a message indicating the error type that
occurred. The errors that may occur in the CFW-08 during the message
processing are errors relating to invalid function (code 01), invalid data
address (code 02) and invalid data value (code 03).
The messages sent by the slave have following structure:
Response (Slave)
Slave address
Function Code
(with most significant bit to 1)
Error code
CRC-
CRC+
Master requests from the slave at address 1 to write parameter 89
(inexistent parameter):
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