Communication Errors; Error Messages - WEG CFW-09 User Manual

8.14.4 Communication Errors

8.14.4.1

Error Messages

CHAPTER 8 - CFW-09 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) and 47h (G).
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.
Timeout between transmitted bytes (3.5 times the time required for
the transmission of an 11-bit word).
In the case of a successful reception of the message, the inverter can detect
problems and send an 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.
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:
Master requests from the slave at address 1 to write parameter 89
(inexistent parameter):
Response (Slave)
Slave address
Function Code
(with most significant bit to 1)
Error code
CRC-
CRC+
327